rough idle on cold start up....why?
03-05-07, 04:27 PM
#1
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rough idle on cold start up....why?
when the car is cold, and i start it, it idles rough. almost like when i blew my last motor. but once it warms up, it goes away and idles fine. What would cause the car to idle like that only when its cold?
03-05-07, 04:59 PM
#5
development
Originally Posted by AWD-RWD racer
could the intake temp sensor cause it if it was malfunctioning?
if it thinks its 20F outside and it's really 100F...it would run really rich (just an example)
why? what'd you do to the AIT sensor?
03-05-07, 05:00 PM
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only code it pulls is intake temp sensor.....code 11 i believe.. you can def tell its not "right: at idle when its cold. but runs just fine once the temps come up
03-05-07, 05:23 PM
#7
Racecar - Formula 2000
Originally Posted by AWD-RWD racer
only code it pulls is intake temp sensor.....code 11 i believe.. you can def tell its not "right: at idle when its cold. but runs just fine once the temps come up
You already know the reason.........why'd you ask us?
Dave
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03-05-07, 08:26 PM
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could be code 22 (or something) fuel thermosensor. it adjusts the idle vac going to the fuel pressure regulator based on fuel temp. if fuel is cold it'll open the vac to decrease fuel. but really its used for hot starts. it blocks off teh vac for 60 seconds when it's hot so it runs extra fuel to compensate for the lower density of the fuel. i really dont know if it would make an effect on cold starts especialyl since alot of people get rid of the solenoid atleast when they simplify the vac system.
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