Idle Problem -- Help

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Jun 26, 2007 | 01:40 PM

smoke20

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From: Washington

Idle Problem -- Help

my eng when warmed up will only idle for about 5 seconds then goes full lean and dies. this only happens when in park, if in drive or with A/C idles perfectly.

i changed the maf, iac, im out of ideas . we even bumped up the idle to 950 and that didnt help. any ideas on where to go from here ????

Jun 26, 2007 | 03:40 PM

NoGo

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From: Mass

What is your spark advance doing during this?

Jun 26, 2007 | 03:41 PM

NoGo

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From: Mass

Sometimes with this kind of stuff it is just quicker to flash in the stock tune, adjust for the injectors and see if the problem goes away....rather than throwing parts at it.

Jun 26, 2007 | 04:39 PM

smoke20

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From: Washington

i wish i had a tuner to put the stock tune back on and try that but i dont , car was tuned by a performance shop, they helped me try to fix problem but we couldnt figure it out.

what changes in the idle when your in gear as to when in park that would cause something like this??? i understand when ac is on there is a bump up in idle but we tried that in park and it didnt work..

i swapped out working parts from a friends car so no cost yet in parts , i dont want to throw parts at it thats why im asking for help.

Jun 26, 2007 | 06:42 PM

BIRDONNOS

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From: memphis, tn

Quote:

Originally Posted by smoke20

sounds like they raised your base running airflow for in gear with a/c, but not in park, this table should have been logged also and changed accordingly. you could log you base running airflow in park, with and without ac, then record you desired running airflow verse engine coolant temp. then you would place those numbers to your base running airflow table in park and this should get you very close to perfect, this is if you have access to hptuners. hope this helps

Jun 28, 2007 | 02:34 PM

NoGo

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From: Mass

Try unplugging the IAC and using the set screw to open your throttle blade enough to keep the car idling. If this fixes your problem, but go after the IAC tables (running air flow tables, Park/Neutral) in the tune. If it doesn't fix your problem, then I would start looking at the fuel and spark tables.