Hissing Sound From Engine Bay
sound - a large ocean inlet or deep bay; "the main body of the sound ran knock - sound like a car engine that is. Well, the removal of POV and the. I heard a retelling noise emitting from the engine bay. Back to the garage again. Loud grinding sound from engine bay Driving home last night I started hearing a grinding noise that I thought was my tires on the highway kind of like the plastic wheel well was rubbing on the tires. The engine sounds like it is rough or maybe out of tune. If you see smoke coming from your tailpipe, pay attention to the color of the smoke; you can use it to troubleshoot engine problems. The engine uses a series of hoses and gaskets to maintain the vacuum. A squeaking noise is generally created by the engine accessories, accessory mounts, serpentine belt or drive pulleys. It sounds somewhat like an air leak or the only other sound I can compare it to is a noisy bearing. The relay kicks the fuel pump into high gear at a certain RPM (somewhere north of 4,000, forgot where exactly). MechanicAdvice) submitted 1 year ago by reggit99 Hey I have a 95 Civic and lately I have heard a sort of hissing coming from the engine, it's not a constant hiss but more of a pulsing one, what could this be?. NEW Tacoma, 6 cyl, tow package. Has anyone had this problem before/know what may be causing it? The engine fires and runs for about 2 secs, if that, and cuts out. It sounds like you have air in your power steering system. Those burning parts then release a burning smell that can smell like a burning engine. These are 2 different symptoms of different problems. 9 I have a whining noise coming from the area behind the alternator on the driver side of the engine. By RightM3 in forum 1992 - 1999. 11 Things Your Car Is Trying to Tell You. Download Stormy Ocean sounds 99 stock sound clips starting at $2. You might want a challenge but slotting a 2JZ into a Vista frame is really quite ambitious. Jul 27, 2004 #10. To check operation of the valve, pull off the hose from the valve (this will require a bit of patience and grunting. Not sure if that is gonna actually solve anything. the state or quality of a hissing sound. I must be honest, most of the newer cars do have this noise and it is apparently due to higher pressures in smaller systems to try and get the same cooling quality with less engine power draw. If the loose piece of an old drive belt is slapping around the engine at high speed, it can sound like an engine rattle. check all vacuum pipes and hoses for leaks when the engine is running your looking for any hissing noises ,use a length of rubber or plastic hose to your ear and probe around the engine bay with the other end like a stethascope it sounds silly but this is a very affective way of finding vacuum leaks. As I reach that rpm the >engine bogs and will go no higher and I started to hear a hissing vacuum >sort of a noise. Due to where it was located it was essentially sucking itself to the side of the engine bay at idle (so wasn't making a noise) but under load it was obviously drawing in air through the hole and making the hissing sound. When I open the hood, I definitely hear the accessory belt rattling. please i need help. As soon as I take my foot off the brake, the sound comes back. I've had an intermittent flickering of the door/trunk/hood/engine bar ajar indicator on the combometer for awhile now. But noise from a running engine can make it impossible to hear a hissing sound coming from leaky vacuum hose or gasket. When the engine speed (not car speed) reached a certain RPM, the Hissing kicks in, constant frequency hiss. My car makes a hissing noise from the passenger side when i drive around 40km/hr ( or 38 ) and but it fades away ( still can hear it though ) after i pass 40km/hr. Problem sounds like the timing chain but is actually the pulley on the top of the engine near the alternator, worth checking before doing your timing chain. ? Is it normal for these cars?. I thought my choke was messing up drivability but it turned out to be a failing fuel pump. A pedal will go to the floor completely based on hydraulic and mechanical operations. ticking noise is. 4 Zetec; We've noticed that occasionally it feels like a loss of power (engine power); putting your foot down hard on the gas pedal seems to resolve it quicker than just ignoring it - once it starts happening it's very hard to drive normally as it constantly feels like it's going to stall over and under revving constantly. I hear it for about 5-10 seconds then it goes away. After trying to pinpoint the source of a ticking / hissing noise from the top right of my A6 C7 3. white smoke coming from engine bay. They say its NORMAL. If when you turn off the jeep and you hear a hissing sound after for a second you have a vacuum leak. The sled is in break in period at about 13hours. This is all new to me. 10 year old A3 with original brake vacuum hose you can almost guarantee there is a split around the connectors. My car has been turned off now for 5 hours, and there is a hissing noise coming from under the hood on the driver's side of the engine. Any of my search term words; All of my search term words; Find results in Content titles and body; Content titles only. To check operation of the valve, pull off the hose from the valve (this will require a bit of patience and grunting. 6 Evo is a worthy tribute to Dino Ferrari, thanks to a V8 engine from a Ferrari F40 and a completely reworked chassis. I cannot see any line that could be leaking and cannot feel any air fuel leak with my hand, but that doesn't mean it could be there. Join the F-150 Online forums now!. Confident it is not the fuel pump 'normal' noise, as this can be heard clearly when engaging ignition and pumps for a few seconds then goes quiet. I have not driven my car much, it's 113,000km right now and it's a Alpina B8 from 1995. Hello All! I drive a 2000 Ford Taurus. The symptoms are a "stumble" and what feels like an erratic loss of power when cruising around at partial throttle. So it does appear when the vehicle is not moving and the RPM's are revving. It would be strange to me that dirt would be concentrated in the back of the engine bay and no where else on the car. It vents fuel vapors to the charcoal canister,but prevents liquid fuel from being vented. In my new punto 2012, I am facing a similar issue: AC had stopped working a month back, got it serviced. you have a control vacuum leak, listen for hissing noise under dash when engine is running. Place it around your engine and then try to determine where the noise is coming from. So, I have 100K miles on a 2007 4Runner (V6) and after having my radiator flushed at the Toyota dealership service dept, I get my car back and now hear a low rumbling noise coming from the engine compartment. Just come back off holiday towing a caravan with 2005 freelander when on the last part of journey I got the wooshing noise accompanied with loss of power, black smoke from exhaust and the engine malfunction light coming on. sound - a large ocean inlet or deep bay; "the main body of the sound ran knock - sound like a car engine that is. Due to the amount of noise present when the engine is on I wasn't able to pinpoint where the hissing was coming from exactly. The car did not always make the noise. Never noticed it. Last weekend i took it for a run and noticed a knocking noise from the engine bay on the way home, i have tried to diagnose it and beleive it comes from the back of the engine and downwards but not totally sure. We examined it and after awhile we turned the engine off for a few minutes. Updated on January 26, 2019. Small amounts of water in the tank is easy to address without removing the entire gas tank and emptying the contents. No check Engine light, followed wingzero's installation thread, and I know there is a slight break in period for the ECU, etc. poor acceleration. If it leaks it can reduce engine power a lot. When I released the brake pedal, the sound again came. Subject: Hissing noise! Please help! more towards the front of the engine bay, and sounds almost like its coming from the radiator or somewhere in the cooling. It is actually louder from the bottom but not specifically one side or the other. Last weekend i took it for a run and noticed a knocking noise from the engine bay on the way home, i have tried to diagnose it and beleive it comes from the back of the engine and downwards but not totally sure. Car engine noise can arise from many factors, and we’ll list some of the common causes for a specific sound. Exhaust coming from your vehicle’s tailpipe should be clear. Yeap, the hissing noise is more noticeable after i had switched the engine off though. The car in question is a 2007 Nissan Altima 2. If the valve is working properly, you should hear a hissing noise from the valve with the engine running at idle. sound - a large ocean inlet or deep bay; "the main body of the sound ran knock - sound like a car engine that is. The hissing noise sounds greater like a vacuum leak. Then, I noticed that there is a hissing sound coming from the back of the engine (in front of the firewall, behind the engine itself) but it is hard to pinpoint it, and I can't really see any obviously cracked vacuum hoses back there. When there's white smoke, check first for coolant leak. Net If this is your first visit, be sure to check out the FAQ by clicking the link above. Garage told me its a very common problem and has had many bmw's with cracked manifolds. I'm unsure if the air is continuously leaking, you definitely get a loud 'psshh' after stabbing the accelerator, it quietens after that and if it is continuing, it's drowned out by engine noise. also the same noise sounds like it 'dumps' when i lift off. This would also help explain the pedal feel. the rpm was around 750-900 rpm and was continuously varying in that range. I'm not sure if it's the down. It is not the blower motor because when the AC is off but the fan is on, I don't hear it. Description: Hissing sounds like air or steam escaping from a pipe or hose. The best (least expensive) way to silence an engine isn’t with fancy mechanical wizardry. This sound is related to the brake pedal for sure. I couldn't find any dye leaks anywhere around the engine bay, so could there be a problem with the evaporator?. Back to the garage again. Brake boosters use one of two different methods to enhance the amount of braking pressure exerted by your foot on the pedal. So it does appear when the vehicle is not moving and the RPM's are revving. 2006 - 2013 Mini Cooper (without Turbo). Hence the poor (hardly any) performance. Rattle: Check the exhaust and its hangers, and your brake calipers and pads to ensure they’re tight. It has a weird shuddering sound between some gears, sounds like we have went over rumble strips when we haven't 3. It sounds like it's somewhere between the engine and the coolant tank, but I can't pinpoint it. He also told me that the Burwen Research machine wasn't anywhere near as good and was considered inferior by many people. I can hear a hissing noise from my engine bay when its under any sort of load. ASUS M2N-SLI Onboard C-Media CM6501: No Sound, Hissing there was only a hissing noise. Due to the amount of noise present when the engine is on I wasn't able to pinpoint where the hissing was coming from exactly. Car audio noise suppression guide. Hissing Noise: Some hissing noise is normal in all power steering systems. If you hear this noise, turn your car off and do not drive it again until a mechanic can determine the problem and repairs have been made. This is all new to me. If the flaps were always flapping in the breeze, solenoid unplugged or not, you'd come to the conclusion that they come loose from the shaft or something else internal to the manifold. Whistling type noise from engine bay Dealership just called, they replaced the intake manifold and either a hose or a hose clamp and that appears to have taken care of the whistle. A good way to check the hoses for cracks is to use pliers to pinch off all the hoses at the source one at a time and listen for the noise to subside. To check operation of the valve, pull off the hose from the valve (this will require a bit of patience and grunting. These hoses and pipes are directly exposed to the heat inside an engine bay, which can cause cracks in them and lead to. What I have noticed as well since this issue came up is that the fuel economy gets worse and worse. You're probably hearing some piston slap under acceleration when the engine is still cold. I havnt heard it again since. Notice if the sound changes with engine speed or vehicle speed. Don't ignore engine sounds-it can lead to serious trouble. Video Forum. Check all the hoses for cracks, loose hoses or hoses that fell off the intake manifold. - Moderate hissing noise then noise peaks every time before it cycles. After I let off the throttle or the trans colled down it would not make the noise. if the hissing sound is coming from the inside then the diaphragm has a hole in it, but if its coming from the engine compartment then it is the vacuum hose connection. These are 2 different symptoms of different problems. It sounds like it's somewhere between the engine and the coolant tank, but I can't pinpoint it. hissing noise in engine compartment. I've also noticed that my oil and fuel consumption (fuel particularly) has been higher over the last 2-3 months. I took it to. It almost sounds as if something is "caught" or is dragging on some rotating object. >My manual 928 is just developing an engine problem. which foams the fluid and makes a whining sound that you can hear from the engine bay when making low speed turns. Comments on "SU Fuel Pump Troubleshooting Guide" Did you find this article useful? Do you have a question or comment about this article? Leave a rating or a comment below, and get instant reply notification via email If you have a long question, or a question not directly related to this article, please start a new topic in the Discussion Forums. Video is dark due to taken under dash area. Please check out the new club website for the Cayman Club at www. driving a swift here. With the accessport, pre-issue, I would consistently get about 9. When I select Reverse I hear a hissing sound that seems to be coming from the Transmission, I can hear it when I stick my head under the car, I thought it was coming from engine bay near Alternator but it seems to be coming from Under the transmission. Don't ignore engine sounds-it can lead to serious trouble. the next day is when i also started to notice a hissing sound coming from the engine bay and when i shut the engine off it hisses slowly and sounds like it's winding down almost sounds like the turbo is spooling i've put my ear all around to try and pin point the sound and it seems to be coming from the middle of the valve cover. As long as you've been paying attention, nobody knows how your engine sounds better than you do, so if it starts to sound odd or even just a little different, there could be a problem. This new air filter is then placed away from the heat in your engine bay so it can draw cooler air. Please check out the new club website for the Cayman Club at www. The matter I am presenting here is regarding HISSING SOUND and NO COOLING in A. Yesterday, When I left office at night, the surrounding was very silent and I observed a hissing sound coming from near the pedals below steering. The 4Runner had been sitting in airport long-term parking for 5-days. 24L and i was recently jumping another fiesta the same as my own and I heard there was a hissing noise coming from my engine bay that wasnt coming from the other car, Any ideas what is could be and is it a major concern?. I'm hearing a weird hissing/whooshing sound from the engine bay that intensifies with RPM. Sometimes, it will emit a hissing sound that can be heard from the engine bay. Don't think of it as a Jag with a Ford engine, think of it more that some folks are very lucky to be driving Fords with Jaguar engines. Where the tranny bolts to the engine area-ish. Last weekend i took it for a run and noticed a knocking noise from the engine bay on the way home, i have tried to diagnose it and beleive it comes from the back of the engine and downwards but not totally sure. But I can't locate it specifically, and I'm not sure whether it's nornal or not. The sound may be especially pronounced during a cold start or during. The Five Overlooked Car Maintenance Items How Preventative Maintenance Can Help You Avoid Catastrophic Repair Costs. The sound sounded like it was coming from the belt or something like that. i know that my camera is poor and microphone suppresses high pitch tones (hissing which i tried to record). Re: Intermittent hissing noise from engine bay There is a relay for the fuel pump that is rather loud. The noise itself is more than a hissing sound, it's more like a wheezing sound, like a violin It picks up as the engine speeds up, but only noticeable when I drive slow, say 30km/h. When the engine speed drops to a certain RPM -- such as shifting to the next higher gear, the hissing stops. Strange hissing noise in engine bay. The hissing lessens after I am up approximately an hour or so and then diminishes through out the day,leaving me with a different more tolerable tinnitus. this is my first car with turbo so i don't know if it's normal - i've been in an mk5 before and i don't recall hearing that noise. Open the hood and look to the back left (as you are looking and the motor) of the Engine Bay. don't worry if your car is not the same, most Japanese starter motors are very similar and this guide will get you through most of them. I havnt heard it again since. 3rd Gen Durango - 2012 Durango V8- Hissing Noise- Could it be the TIPM? - Hi, I have a 2012 Durango V8 with abt 36K miles on it. But noise from a running engine can make it impossible to hear a hissing sound coming from leaky vacuum hose or gasket. The siss, is not the typical "ring" in my ear per say, but a hissing noise, only in my right ear. 0TDI + slight smell of fumes in the cabin at points, I decided to remove the injector seals today. Summary: Taylor Hebert, the current host to the Queen Administrator shard, is having the worst day of her life when an accident in another dimension deals. Confident it is not the fuel pump 'normal' noise, as this can be heard clearly when engaging ignition and pumps for a few seconds then goes quiet. that's why the hissing sound, so they said they have to repair the hose and seals. On that note, if you or a mod wants to change the title to 'exhaust fumes in cab' or something more suitable for the search box. Sometimes I hear a fan like noise or something that is spinning coming from the engine bay or perhaps just somewhere in the dash. Three times the engine was cold, once warm. USE 10W-40 oil from Shell Helix HX series change oil filter to Toyota Genuine filter the air hissing could be bad door sil rubbers check for any damage or fracture in door rubber seals if it is from the engine bay check for any fractures in air box & flexible hose over throttle body. A faulty exhaust manifold gasket will produce an exhaust leak that will sound like a hissing or tapping sound coming from the engine. It's important you use a good sealant here like 'Tiger Seal' but I actually used a plumbers sealant called 'Plumbers Gold'. Any help would be great, abit scared of driving it now incase of failure of the brakes. When poking my head around the engine bay recently while the block heater was plugged in, I noticed a fairly loud steam hissing sound. The history of the "People's Car", the Volkswagen, the center began on 28th May 1937, when the company "Geselschaft zur Vorbereitung des Deutschen Volkswagen gmbH" was established. Often, the engine stalls when stopping. Not constantmaybe every 20+ seconds or so. A bit of tape over the hole has removed the noise completely, so now just need to replace the hose. Clifton pointed out that POVs eventually will start to leak; he took the POV off of his Z31 with a pipe wrench and welded a bead around it. As I reach that rpm the >engine bogs and will go no higher and I started to hear a hissing vacuum >sort of a noise. Gas leaks to oilway. I just started noticing this recently, when the AC is on (or defog, which uses the compressor) I can hear a hissing noise in the cabin. I have a 1998 Expedition 4x4 that has had a number of problems that I am trying to get taken care of, since I am the new owner. Car audio noise suppression guide. This recently. Engine off, hissing noise, 3x times. returned to corning ford for more service work. propagated noise Vibrations of the Fuel Rail and Engine Surfaces Radiate Noise Industry solutions: • Structural modifications to render cylinder head and Fuel rail more stiff on itself and more isolated from the injector excitations • Engine Bay Sound Proofing Low Noise Emission During Operation. Check all the hoses for cracks, loose hoses or hoses that fell off the intake manifold. The noise sounds likes it is coming from the area in between the radiator and the front of the engine. The relay would be more of a clicking noise, could this be it?. Sometimes I hear a fan like noise or something that is spinning coming from the engine bay or perhaps just somewhere in the dash. I just had the fuel system cleaned and new plugs done at dealer but it has been happening long before that. Many of these hoses control your car's idle, emissions components and environmental controls such as. A leaky exhaust valve can be due to carbon buildup, a worn valve guide or a valve that's seating poorly and letting hot exhaust gases past a point where the valve "burns" and erodes at its edge. 6L, and the noise IS coming from the engine bay area, it is not coming from anywhere else on the car. The plastic engine cover really insulates things well. 2-10-2 Santa Fe steam train shunting. The Five Overlooked Car Maintenance Items How Preventative Maintenance Can Help You Avoid Catastrophic Repair Costs. Symptoms of a vacuum leak include the Check Engine light, rough idle, stalling and a hissing sound coming from the engine bay. They also found a leak in the steering gear from a boot. i know that my camera is poor and microphone suppresses high pitch tones (hissing which i tried to record). Victoria Falls — the Seventh Wonder of the World; the largest waterfall in the world. and theoretically, since it makes the intake runners (tubes) longer, that should help you reach your max torque output sooner in the RPM band. The hissing lessens after I am up approximately an hour or so and then diminishes through out the day,leaving me with a different more tolerable tinnitus. Couldn't find anything out of the ordinary. I'm hearing a weird hissing sound from the engine bay that intensifies with RPM. If you do continue to drive with the noise, you could damage your engine to the point needing a completely new engine. I have replaced the cap, rotor, plugs and wires, and the issue has come back after only a few hundred miles. 6L 3-valve or 5. Learn about the ins and outs of cold air intakes and let us bust the myth on why cold air intakes really do work and how they improve your vehicles performance. If an inspection of the dipstick shows the oil to be bubbly, watery or chocolate milk-like in appearance, the engine is indeed showing symptoms of a blown head gasket, the likes of which could be due for emergency maintenance. i obviously know its not dumping like a turbo but similar sort of. Ford F-150/F-250: What is that Burning Smell? Burning smells from under the hood of your F-150 or F-250 can mean many different things. will produce an exhaust leak that will sound like a hissing or tapping sound coming from the coming from the engine bay. Preventing the oil vapours from getting into the intake manifold clearly has some benefits. Ford Owner | New Buyer's Guide. This is important because being able to discern a vehicle’s running condition by sound is a valuable ability to hone. A look at the engine bay of a modern Subaru will reveal quite a bit of sound insulation. Opened the bonnet and checked but couldn't feel any air leakage but hissing sound quite prominent. Jul 27, 2004 #10. When I turn the volume down or when I select a source that is not being fed anything, i. The brake servo is forced into a strange existence; half in the engine bay, and half under the wing. He did a complete round trip to bring the cat home. Replace it along with the 2 bolts and springs. 7, with the most recent fill up coming out to 11. Any idea what is causing this and if it is normal?. 5 year old Optima Red Top (34R) in my 4Runner and noticed a hissing sound coming from it after driving it yesterday. I did a second round of the throttle-body-cleaner test, but didn't find any hot spots. If engine noise is your culprit, you may hear a whining or clicking sound. Hi just been reading this thread as I was looking for some info about mine. Is it normal for there to be a loud sucking or hissing sound when starting the car up?. Could someone please tell me what that is?. At first I thought it was some sort of strange vibration but i've realised its only when im actually pushing on the pedal. Can anyone help me with this peculiar request ??!! I was just parking my VVC back from a dinnertime run next to another vehicle and there sounds (to me !!) like a very small hissing noise ?? Can anyone enlighten me to what is may be ?? Does'nt get any louder when the engine is revved and is not noticed when the car is running. What else could be causing the noise? A: There are many potential causes for a noise of this type. Drive belts are a flexible construction of rubber over fiber and metal cords. I also just listened for any air leaks in the engine bay and its hard to hear any air hissing over the sound of a 4. You will probably read a great deal on the internet regarding the issues surrounding your Sprinter lapsing into limp-home mode without showing any EML (Engine Management Warning Lamp). This is a budget-friendly option for cars. Sound happens when brakes are not in use. Actually, a couple of consistent sections on my way to work. Sounds like a hissing/squeaky electrical interference sound. Because of construction and no safe place to pull off the highway in the desert I drove on. I am unfamiliar with this engine/chassis and I've only had the car for a few months. Now that I'm listening for it, I can definitely hear a hissing sound from the engine bay with the car running. Two days ago I was >startled when I couldn't get more than 3200 rpm. I couldn't find any dye leaks anywhere around the engine bay, so could there be a problem with the evaporator?. While the engine is running, listen carefully for any changes in the engine's idle sound. The noise is not loud and it sounds like a tire puncture but I've checked the tires and see/hear no puncture and air loss. it still seems to pull quite well. >My manual 928 is just developing an engine problem. A good way to check the hoses for cracks is to use pliers to pinch off all the hoses at the source one at a time and listen for the noise to subside. So what does a hissing sound mean?. com and affiliated sites. (I live in Canada btw). This one is a reach, but worth checking. Discussion in 'Cavalier, Calibra, Vectra, Signum, Sintra & Insignia owners forum' started by shomi, Oct 24, 2002. Rectification Route – In this instance the fault was located to the engine oil dip stick. Hot engine shut downs can lead to oil leakage by causing oil to coke up in the oil drain and forcing oil out around the turbine and seals. It is almost like a white noise sound. Engine, Transmission, and Performance. I thought it sounded like my transmission might be slipping but it sounds like it coming from the engine bay?. Description: Hissing sounds like air or steam escaping from a pipe or hose. Here are a few helpful tips to get you in the right direction. Having problems with a vacuum being created in my fuel tank. But the sound isn't coming from that area at all. the rpm was around 750-900 rpm and was continuously varying in that range. This is not that noise. Opened the bonnet and checked but couldn't feel any air leakage but hissing sound quite prominent. the next day is when i also started to notice a hissing sound coming from the engine bay and when i shut the engine off it hisses slowly and sounds like it's winding down almost sounds like the turbo is spooling i've put my ear all around to try and pin point the sound and it seems to be coming from the middle of the valve cover. When I rev the engine the sound does not increase so I don't think it's a belt issue. Why Does my Clutch Make a Noise?. Join the F-150 Online forums now!. Nothing required. It's intermittent, but usually shows up at about 2600 and 3600 rpms. Found a few different RailSounds boards while poking around looking for something else, and as usual, I can build them into complete sound systems. TOYOTA CAMRY IV 98 Camry variable rpm Yesterday when i started the camry after 20 mins break the car was showing variable rpm and was making noise like increase engine noise decrease engine noise. A lot can be learned by listening to your engine, so if your car starts to change its tune, you should take heed. Edit: My high pressure was about 44 psi and my low pressure was about 49 psi. Hi, I have all mods in my sig and have about 25k on her. i know that my camera is poor and microphone suppresses high pitch tones (hissing which i tried to record). It vents fuel vapors to the charcoal canister,but prevents liquid fuel from being vented. If the offending bearings are in the water pump, it will need to be replaced entirely. You can hear the leak when you pop the bonnet with the engine running, and it is obvious when you feel near the pipe for a leak. This is important because being able to discern a vehicle’s running condition by sound is a valuable ability to hone. If you hear a hissing sound near the fuel filler door. No rough idle symptoms and acceleration felt good. please i need help. Any idea what is causing this and if it is normal?. On that note, if you or a mod wants to change the title to 'exhaust fumes in cab' or something more suitable for the search box. The sled is in break in period at about 13hours. Gonna hose down the engine bay and then idle it and see if anything happens. At first, I thought it was my water heater, but no. Here is a video of my engine bay and the sound I can hear in the cabin. The sound of air hissing in the exhaust or out the tailpipe tells you the exhaust valve is leaking. I tried looking for it today but the hissing was. well took it back to the mechanics at the dealership today, phonecall ended up with "heater control valve-$55 and EGR valve on engine=$100 or so. 8L/100km, calculated by hand. The 4Runner had been sitting in airport long-term parking for 5-days. When the engine speed (not car speed) reached a certain RPM, the Hissing kicks in, constant frequency hiss. I've also noticed that my oil and fuel consumption (fuel particularly) has been higher over the last 2-3 months. Although this hissing noise, sounds like a bad noise, it's actually a good air conditioning noise. i obviously know its not dumping like a turbo but similar sort of. When I rev the engine the sound does not increase so I don't think it's a belt issue. If you do continue to drive with the noise, you could damage your engine to the point needing a completely new engine. Cayman S Hissing noise from engine area while driving. When getting into a running engine bay of a car, BE SURE to tie back any long hair and stuff it in the back. I have a 2007 Silverado 1500, Z71, Ext. Engines that have turbo are more prone to a boost/intake leak as compared to non-turbo engines, because of the added numbers of pipes and hoses joining the turbo with the engine equipment and the pressure that a turbo gives. You can hear the leak when you pop the bonnet with the engine running, and it is obvious when you feel near the pipe for a leak. Its loud enough to hear standing next to the cruiser with the hood closed when the garage is silent at night. Directing the crankcase gases straight into the air by pulling off the pipe from the rear valve cover grommet will cause the inside of the engine bay to be coated with a thin layer of oil after a while and pollute the atmosphere. I have done everything I can think of. You can try and lessen the sound by replacing the expansion valve. So I drove around the block and no check engine light or anything. Pay attention to whether the sound occurs while the engine is running or not, whether you are in gear or not, with the clutch pushed in, etc. but when the noise returns it's much louder to the point. I thought the ODB II would indicate a vacuum leak, but perhaps that is not available on Honda's?. The truck is plugged in at night and the block is very warm when i crank it. When it is working properly, your cars' air conditioner is a wonderful thing. It vents fuel vapors to the charcoal canister,but prevents liquid fuel from being vented. When I turn the volume down or when I select a source that is not being fed anything, i. Duration: 66 minutes 48 seconds, Size: 91. About the size of a pencil. Never noticed it. Has any one of you had or have the same problem. original service october 11 / 2015. of New Linea T-Jet FL India 2014. Yesterday, When I left office at night, the surrounding was very silent and I observed a hissing sound coming from near the pedals below steering. It only made the noise when the trans temps reached about 200 and I needed to use a little more throttle like getting back on the interstate or passing. From what I've read so far, the noise is probably the expansion valve.