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Stalling and Idling Problems - No Leaks! What the heck?

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Old Sep 18, 2008, 06:32 AM
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Stalling and Idling Problems - No Leaks! What the heck?

Hey guys,

I have an '03 Evo, 62k miles on the clock.

Mods under the hood: Apex'i Intake, MBC, TBE. That's it. Car was tuned and has had this setup for over 20k miles.


Just this week, I come to an exit ramp and my car stalls. I start back up, it just dies again. I increased the idle (screw in the TB) and it doesn't stall, but the idle isn't right. On cold start (it was cold this morning) idle is usually 1500 rpms for a while, than it drops down. Now, on a cold start, it immediately drops to 600-800rpms; it almost wants to stall/die again. Overall, however, the car drives fine, and the turbo is generating full boost and the car feels fast.

Boost leak test revealder NO boost leaks anywhere. Oil looks good.

Another thing to add - I discovered my stock turbo has shaft play (not sure if that's a factor).


***EDIT*** Problem solved. See my last post.

-Jeff

Last edited by Solo II Evo; Nov 4, 2008 at 10:35 AM.
Old Sep 18, 2008, 09:27 AM
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You have a wideband sensor?

I'm curious to know if the front o2 sensor is on the fritz.
That or the needs to be cleaned
Old Sep 18, 2008, 11:19 AM
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Check your furl pump!

slowly turn your key through all the positions, and you should hear the pump pressurize the after it has been sitting not running for a while. or check for clogged or crimped fuel lines. maybe one got pinched on a speed bump or a something.
Old Sep 18, 2008, 06:48 PM
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Hmm, good suggestions! Thanks for the input!

I checked the fuel pump, it seems to make the same noise it usually does.

I should note the car feels totally powerful as usual.


I didn't check the o2's yet - I'll go check that out next.
Old Sep 19, 2008, 09:48 AM
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How do I check my IAC to see if its the culprit?
Old Sep 19, 2008, 10:12 AM
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I've seen a couple 03's with the ISC plastic gear rip the teeth off and have the symptoms all of a sudden like you are describing.

Pull the gear assembly out and check it. It's under the tbody, black plastic.

It cost's over $100 unfortunatly.
Old Sep 19, 2008, 10:16 AM
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It sounds like a airflow issue...Swap a maf with someone if you can so you can atleast eliminate that as a possibility.
Old Sep 20, 2008, 05:03 AM
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well I got ahold of a test throttle body in good shape w/ newer sensors (Still from an VIII)

I'm going to see if this alleviates the problem.
Old Sep 20, 2008, 06:13 AM
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I didn't get to install the TB yet, but this morning on my way to class, my idle is bouncing from 1400-1800, than goes up to 2100 and sits there. yay!


Dammit.
Old Sep 20, 2008, 07:50 AM
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im havin same issues!!!!
it sucks!!!
Old Sep 20, 2008, 08:03 AM
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Behind the valve cover sits the throttle cable on a sliding bracket of sorts it has to bolts holding it there if this is too snug or too loose it will give you strange idleing and stalling issues.

In your case Id look for it to be to tight man
Old Sep 20, 2008, 08:17 AM
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Originally Posted by gsrboi80
Behind the valve cover sits the throttle cable on a sliding bracket of sorts it has to bolts holding it there if this is too snug or too loose it will give you strange idleing and stalling issues.

In your case Id look for it to be to tight man
THrottle cable is tight - thanks for the suggestion though!

I'm leaving to go to the shop in a few - John @ Pruven is going to throw it on for me and go through the car to make sure this problem goes away.


Oi.
Old Sep 20, 2008, 09:41 AM
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Did you check the ISC motor gear yet? (like I suggested above)
Old Sep 20, 2008, 01:56 PM
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Originally Posted by razorlab
Did you check the ISC motor gear yet? (like I suggested above)
I tried to get it off, so I just got a replacement throttle body w/ newer sensors (off an '04 with 20k miles).



It indeed was the ISC. Problem resolved it seems!
Old Sep 27, 2008, 07:08 PM
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how is the car...did the new throttle body do the trick?


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