When I start my car, It idles so low that the car stalls. I am guessing this is because my IAC is clogged? Can anyone help me with this problem?

damn, my car just started doing this as well. Happens ONLY when sits overnight in cold weather <65F. Need to feather in some throttle to keep it from stalling when starting in the morning, once it gets over 1K rpm the ecu begins to think, measures ambient temp and stock warm up procedure beings (keeping it above 1k rpm) then warms up and then its fine. Here are the things that are not in a window of 85-100% on the car. 6 year old Optima red top, poor cold start Amperage to begin with, needs new plugs (approx 30k on them), 155K miles on the engine. Its a 7afe btw. I'd check those two things and go from there if, I plan to.

More than likely IAC valve. Its mounted on the under side of the throttle body. 4 screws removes it from the TB. You'll know what I'm talking about when you see it cause once you pull off the intake hose, you'll see right before the butterfly valve, theres what looks like triangular grooves in the throttle body. That's where IAC valve mounts up.

Looked at my plugs, 3 of the 4 platinum tips were missing (S&%T). Replaced them with some basic $2.50/plug NGK copper's. It starts right up with no hesitation, but I still need to feather in some throttle for about 30-50 seconds then its fine (only after sitting in cold temps <65F). I didn't check the battery but it hasn't given me any problems lately, OPTIMA FTW. The IAC does sound like a reasonable prognosis after the new plugs and a reasonably o.k. battery. Will work on this weekend. Thanks for the help

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I'd look into the idle sensor if the IAC is not your problem. My sister's 98 Lexus ES300 was doing this and I changed the idle sensor and it worked fine after that. Hope this helps!


-Ryan

This post has been edited by str8thugginit4ya: Nov 5, 2009 - 8:45 AM

hodgie,

Did you ever find the solution to this? Was it the IAC?
Mine (7afe w/ ~160k miles) is showing the exact same symptoms. Seems to be a common issue with these things.

have the same problem..... only in winter....

ditto on my 93 prizm with 7afe, replaced IAC and did not fix the issue.

bump

i have the same problem, i'll be taking a look into it when my parts arrive which will be in a month or two

95 5sfe .... Doing almost the same ... Replaced all spark plugs, throttle body, and vacume lines... It starts and idles at like 800rpms... I drive it around the block and the cars warms up and runs extremely perfect.

Problem: 5sfe rough idle when coming to a stop?

How can bad motor mounts be the cause of rough idle?

My alltrac's 3sgte does this too

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distrib, alt, igniter coil, wires, plugs, ecu. could be anyone, I just hope you dont have the end result as i did