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Unread 04-19-2009, 01:12 PM   #1
SpriggZ
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2004 TJ Wrangler 
 
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04 2.4L air leak when gas pedal is pressed

Hello I'm relatively new to the Jeep world as well as the mechanical world so please bear with me. My 2004 4 cylinder 2.4L 5 speed manual transmission Jeep TJ seems to have an air leak coming from somewhere. Whenever I press on the gas pedal you can hear air being blown out somewhere. Now it's not a constant blowing sound, just as soon as I press on the gas pedal. I'm assuming its the plastic air intake manifold that has a leak somewhere? If so, how much should this cost to repair and where can I find this part? Auto Zone and O'Rileys didn't have it.
Also for what it's worth, whenever I start my engine cold it doesn't want to stay started. I have to constantly keep on the gas and if I take my foot off the gas, the engine stalls on me. Would this be caused by a faulty sensor or would this have to do with the air leak?

Thanks!

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Unread 04-19-2009, 01:51 PM   #2
GOLENJEEPTJ
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2002 TJ Wrangler 
 
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Sounds like a vacumm leak?Check for disconnected or bad hoses at manifold area?Welcome to JF!
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Unread 05-01-2013, 10:02 AM   #3
Trevelyan
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Sorry for reviving an old thread and if you guys think I sound just create a new thread I will but this one I was able to find on Google which means other people in the future should be able to as well.

I have a 2006 2.4L 6 Speed Wrangler that is experiencing the exact same issue with the air noise coming out when initially pressing on the gas. It more or less sounds like 'PSSSSS' the moment i press the pedal then goes away kind of like if you were to let the air out of a balloon and it doesn't make a farting sound. Sorry but that's the best analogy I could think of and i could have probably used better verbage but I couldn't think of anything at this moment. The car is fairly new to me so I can't tell or notice a difference in loss of power or anything especially since I went from a 4.0L liter to a 2.4L.

I've opened up the hood and played with the throttle and determined it's coming from somewhere around or near the throttle body or the big black plastic piece near it but I cannot locate the exact location. Does anyone have any idea what could be causing it without me having to rip out everything surrounding it and just start replacing parts?

FYI - I'm not having any issues with starting up the vehicle like OP initially had. The only issue I'm having is that obnoxious noise.
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Unread 06-04-2014, 07:01 AM   #4
Trevelyan
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Location: Chesapeake, Virginia
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I had someone PM me about this issue saying they were having it too and was asking if I ever found a resolution. Unfortunately I haven't so I'm going to bump this again to see if anyone has any suggestions on what it could be. I'm worried it's effecting the actual power of my car and could possibly be a reason my cars struggles taking off sometimes.
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Unread 06-04-2014, 07:27 AM   #5
JStMarie
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You very likely have a vacuum leak.

My preferred method for finding the general area of a vacuum leak is to use a propane bottle to spray small amounts of propane gas in the engine compartment, moving slowly and while the engine is running, and listen for the engine to spike up (even slightly) in RPM. Once the general area is known it doesn't take to much effort to find the leak itself. I use propane because it leaves 0 mess behind as opposed to solvents which can damage plastics, etc...

I would remove the air cleaner before I started, in your case, since it is likely near or around the throttle body or intake manifold.

Good luck.
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Unread 06-04-2014, 11:41 PM   #6
Sudcalifornio
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i have the same engine. have you done any tune up? did you check the tps?
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Unread 09-22-2014, 01:31 PM   #7
Knudtsonm
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2004 TJ Wrangler 
 
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I also have the same engine and am experiencing the same sound w/o stalling or anything.

Did you guys ever figure out what it is?
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