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Intake hisses - Wrangler Jeep Cars & Trucks

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Check for vaccume leak but if its a 3.8 there are noise makers normal

Posted on Nov 26, 2013

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Posted on Jan 02, 2017

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Have02 buick cent,starts right up,I hear air hissing while drivin doesn't have the power to go up hill,it will not go over 45 on hwy,bought,controlvalve,EGRvalve,TPsensor,and in tank cleaner.help?plz!


Check for vacuum leaks. Hissing usually indicates a vacuum leak. Check around the intake manifold and intake runners, pcv valve, vacuum lines, brake booster and anything else (air conditioner controls if you have automatic climate control) that runs on vacuum. A hiss that is louder inside the car is usually caused by either a brake booster leak (closer to driver side) or the air container controls (closet to the center console). Good luck.

Mar 17, 2017 | Buick Cars & Trucks

1 Answer

Intake gasker


well , put a rubber tube (1/4"ID) hose to your ear.
now find the hissing object, then post the name of object.
if unsure the name, post a photo pointing to it.
simple huh?
btw hissing is normal at the throttle valve. if the air clearner
fell of of some silly kid put on CAI mods. (99% CAI are BAD news.)

Nov 25, 2013 | 2006 Jeep Wrangler 2.4

1 Answer

I have a hissing noise by my upper intake. Codes of p0171and p0174. Rough idling down and then eventually turns off


Your O2 Sensors are reporting a lean fault codes

So you have a vauum leak where you hear the hiss

V6 or V8 ?

Mar 09, 2011 | 2001 Lincoln LS

1 Answer

Starts and idles fine but has loss of power during driving and I hear a hissing sound I never heard before


A hissing sound is usually a vacuum leak in the intake system. Look for loose hoses (with the engine running) and the source of the hiss. If you find a nipple hissing, it may have lost a cap (it may be a vacuum test port) that prevents air entry.
An aside note: be sure to change the timing belt at the proper time. If it breaks while running, the engine with suffer severe valve and piston damage (many penny!)

Nov 25, 2009 | 2001 Daewoo Lanos

1 Answer

It make a hissing sound and then it shuts off


open the hood up and look for a missing vacuum port plug on the engine intake manifold, sounds like the case here, that would cause a really loud hissing noise.

Sep 16, 2009 | 1996 Buick Skylark

1 Answer

2002 Mitsubishi Galant gets poor acceleration.


LOOK AROUND THE AIR INTAKE HOSE.MAKE SURE IT IS INTACT NOT LOOSE.CHECK ALL VACUUM HOSES ON INTAKE.MAKE SURE THEY ARE IN PLACE.

Aug 17, 2009 | 2001 Chevrolet Impala

1 Answer

My mazda 6 is idling and shuts off, and there is a hissing sound coming from the engine you can hear it just can't find where. This all started when the hissing began. I found 3 hoses cracked and I...


You still got a vacume leak, best chk. all your vacume hoses paying close attention to the one that goes to your break booster, it also could be an intake gasget, You can chk. that by spraying a little WD-40 around the intake and vacume lines while its running if it reves up than thats where your leak is, not a whole lot you don't want to start a fire.

Jul 17, 2009 | 2006 Mazda 6

2 Answers

Hissing sound from engine & check engine light on


sounds like an intake manifold gasket leak.

Jul 11, 2009 | 2004 Suzuki Forenza

2 Answers

Air intake tube?


This sounds silly but try using a piece of garden hose (or any other hose) held to your ear, using the free end as a probe. You will be able to pinpoint the source of the hissing noise and see what needs to be fixed.

Jul 09, 2009 | 2003 Mazda MPV

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