Car idles rough when cold

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12-24-2006, 12:20 PM

turbored

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Car idles rough when cold

when i start the car up, it idles at about 1200-1500 fluctuating for like 20 seconds, w/ vacuum @ about 19. Then it decides to behave, idle goes to about 1000, and vaccum to 21. Thoughts?

12-24-2006, 12:47 PM

olderguy

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year?

12-24-2006, 12:56 PM

boostinsteve

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IAC going bad. For some reason you have a temporary vacuum leak. Might even be the ISC thing on the bottom of your throttlebody. I was having a problem with that also, see if the ecu is throwing any codes.

12-24-2006, 02:45 PM

Braineack

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what size injectors?

12-24-2006, 07:14 PM

turbored

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1.8s on a 91 with no engine management other than greddy setup.

12-25-2006, 01:13 PM

ruger988

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same setup as me...except a 90 not 91...and im having basically the same problem (1.8's here too)

12-25-2006, 02:18 PM

F20turbo

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normal 1.6L ecu cold start hiccups....dont worry about it.

12-25-2006, 03:39 PM

boostinsteve

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I just got my wideband in and because of the enrichment mode, the damn thing runs at like 12:1 just idling, it dips down to 11.5:1, that could be what you are seeing also.