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Is This A Computer Or Mechanical Problem?

GTRAAH

By GTRAAH,
in General Maintenance

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GTRAAH Experienced

GTRAAH

Posted
Posted

Breifly want to state what my car is so i might be able to get some help, i have upgraded my car Cams , turbos, fuel reg, injectors, pump, PFC, afms, air pods. Tuned Etc. Now when i leave the car off for about 1 hr then start it again it once in every 10 starts it needs a push on the throttle to get it up to stable idle. Why is that? Cold start it ALWAYS starts perfect. Could it be that theres not enough fuel going in at warm crank meaning Tune? But then why does it only do it sometimes?

mad082 Grand Master

mad082

Posted
Posted

the tune is possibly marginal where sometimes it will start, other times it won't.

that said it may be something like the IAC or AAC is sticking ever so slightly and not quite returning to where it should be to allow the car to start first go.

mad082 Grand Master

mad082

Posted
Posted

IAC = idle air control

AAC = auxilary air control

basically they regulate the amount of air going into the engine at idle and when things like the aircon are turned on to counter the extra load that they put on the engine. if they are sticky then they make be letting in the wrong amount of air so the car doesn't start properly.

as for the tune being marginal, the part of the tune for warm start may be a bit ordinary. it may need a bit of fine tuning to get it a bit better. it may be good enough to start under most conditions, but certain conditions (different air temps, engine temps, etc) may be just different enough for the tune not to be good enough to start it without a bit of throttle

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