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Car stalls when I take my foot off the gas! I can't seem to figure this one out

#1 User is offline   vbb 

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  Posted 29 August 2010 - 03:50 PM

I've had an odd issue that I can't seem to get a handle on. When I first start my car, the idle is kind of rough for a minute before it evens out. As soon as I press the accelerator (or just open the throttle) and then let off, the idle drops way down, and the car will either stall, or come really close to stalling out. If I keep my foot on the accelerator, even just keeping the revs up to around 1k-1.5k the car is fine. It's just that everytime I let off the gas, the car does that weird stalling thing.

My troubleshooting:
I first noticed it about a month ago. I did a MAP sensor "whack," changed the spark plugs and checked for any air leaks. It fixed the problem for about two weeks. The problem came back, and then I threw a p1129 code. I then took the MAP sensor off, cleaned it, reset the ECU and cleared the code with my scanner. The problem went away for about three days, then came back again, only this time, no p1129 code. So yesterday, I replaced my MAP sensor with a new one, took my intake off (I just have a K&N short ram) cleaned it and put everything back on, reset the ECU. The problem didn't even bother going away this time. Also, I threw a random p2279 code. I've checked everywhere for any air leaks, and I don't see/hear any. I just cleared the code, let it idle, and the code hasn't come back. But the darn problem is STILL there.

Any ideas? I don't know what to check next. At the moment, I am not throwing any codes, but the problem hasn't gone away either.
2009 Lexus IS-F (obsidian)- current
2010 Acura TSX (premium white pearl)
2005 Honda S2000 (silverstone)
2007 BMW 335i(alpine white)
2004 Honda S2000 (berlina black)

#2 User is offline   Opc 

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Posted 29 August 2010 - 11:40 PM

fuel pressure issue? clogged fitler, fuel pump going?

#3 User is offline   vbb 

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Posted 30 August 2010 - 06:29 AM

Would a failing fuel pump cause the car to act this way? The car rides fine as long as I have the accelerator depressed... it's when I lift my foot off the gas and let the rpms fall to idle that it acts like it wants to stall out. But I'm open to any ideas at this point.

#4 User is offline   Reckon 

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Posted 30 August 2010 - 08:58 AM

Perhaps your intake connections are incorrect?
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#5 User is offline   Crisgo 

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Posted 30 August 2010 - 10:50 AM

Did this start to happen shortly after any mods? A few things I would look into are: valve adjustment, block or pinch off the pcv valve and vac hose to the booster and purge control solenoid, clean and or replace the idle air control valve. It sounds like you have a vacum leak somewhere or it is possible debris is caught in the idle control valve. Did you ever remove the intake manifold or throttle body?
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#6 User is offline   vbb 

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Posted 30 August 2010 - 02:09 PM

No, this did not happen after any mods. I have a short ram intake that has been on the car for over a year, and a private label header that has been on the car for 6+ months. The rest of the car is stock, including the cat and exhaust. I haven't removed the intake manifold or throttle body for any reason either. If it is a vacuum leak, I can't seem to find it anywhere.

#7 User is offline   jimnasty23 

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Posted 30 August 2010 - 02:16 PM

Its most likely your TPS, mine does the same thing, but doesnt die, it catches at the last bar(on the rpm gauge). So i brought it to honda and they said my TPS(throttle position sensor) was reading only half of what it was supposts to be reading. This could potentially be the same issue with your car, but worse. Check it out. Theres a DIY TPS sensor replacement forum on here. look it up and research it.
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#8 User is offline   vbb 

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Posted 30 August 2010 - 02:47 PM

I have not checked the TPS. For the record, mine has only stalled out completely twice. Usually it will "catch" at the last possible second just like you described. I will check that out.

#9 User is offline   jimnasty23 

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Posted 30 August 2010 - 02:55 PM

ya, mines not as bad as you said, but if i like give it gas while im in neutral the rpms will go up and fall all the way down then catch like you said(only when its fully warmed up).
I bet its your TPS. If i could id try to fix my problem now, i just dont have the 800$ to buy a new TB and i dont want to modify a integra tps on my throttle body, im a bit of a perfectionist..

#10 User is offline   jamest16748500 

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Posted 30 August 2010 - 05:49 PM

also check your ivac and clean it

#11 User is offline   vbb 

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Posted 30 August 2010 - 07:29 PM

Quote

also check your ivac and clean it

Ivac?

Also, is there a way to check the tps to see if that's the issue without replacing the entire throttle body?

#12 User is offline   Not Sure 

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Posted 30 August 2010 - 08:17 PM

Quote

Ivac?

IAC motor - Cleaning it sometimes fixes your problem.

THere's a lot of old threads about this:

http://www.s2ki.com/...pic=386868&st=0

#13 User is offline   jimnasty23 

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Posted 31 August 2010 - 09:54 AM

Quote

Ivac?

Also, is there a way to check the tps to see if that's the issue without replacing the entire throttle body?

I went to honda because mine got real bad, they hooked it up to there computer and told me its reading half of what the tps sensor is suppost to be reading( i forgot the numbers, i think its 5.0 ohms? I could be wrong. but mine was half of that), which usually means your tps is going bad(says honda). Now there is a thread on how to test the it, and also a thread on how to replace it without replacing the entire TB(i personally dont trust the diy thread on replacing it, but alot of ppl have done it and have had great success).

#14 User is offline   americansailor89 

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Posted 30 October 2011 - 11:06 AM

i am having this same issue right now. only i just installed a skunk2 70mm throttle body. the car ran just perfect before, and now something is wrong. my tps volts is at .5 at adle and WOT is supposed to be 5.0v but mine is at 9.7. idle is normal volts, WOT is almost double. not sure why. and not sure if this would having any issue with the car dying. please help
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#15 User is offline   2003AP1 

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Posted 30 October 2011 - 06:01 PM

Clean your IAC and tb if that dont fix it you need a tps more then likely like stated above.

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