Odd Iac operation

Newfie_dan · Post by **Newfie_dan** » January 26th, 2009, 10:24 am

ok first let me start off by saying that I have researched the IAC issues many people face and I have throughly cleaned mine and here is what I am finding. When its warmer out say between -10 and up degrees celsius the idle works just fine, no problems it just starts high (@2000 rpm) and then drops down to a comfortable 650~750 rpm when warm and stays steady at that when at idle. But when cold say -21 degrees celsius it jump around between 1000~1500 rpm. I plug it in at night with the block heater when it reaches those temps. Now I have never had an IAC work and then not work on me. Its intermittent and I never get any codes with it which I find really odd. Its a 96 and obd2 setup. As an added note it has always been slow to return to idle when at a light say about 5-10 seconds to come down to the low 750 or so rpm range. So any ideas on it or anyone have a good IAC/complete throttle body with the IAC on it for sale?

Daninski · Post by **Daninski** » January 26th, 2009, 10:37 am

Ok Dude a shot in the dark here. Spray your throttle linkage liberally at the throttle body with a light lubricant/penatrant (not WD40) and see if that helps. Usually if there's a moisture issue it would cause issues once the ambient drops below 0. Cheers.
PS I have a 96 as well.

Newfie_dan · Post by **Newfie_dan** » January 26th, 2009, 10:55 am

yeah I was checking out ur profile before, I am also going to be looking at a klze swap and I might hit ya up for some info once I get it all gathered together for the swap. I should also mention that the engine is fully warmed up when the idle goes jumpy on me. If I do a cold start it just wants to idle high then when it hits operating temp it starts to jump. Also the slow return to idle is there no matter what the temp is when the IAC is working right.

Ryan · Post by **Ryan** » January 26th, 2009, 11:15 am

Everything shrinks in the cold(except water, but is weird). It could be that there is such a small leak somewhere that it only apprears in the colder weather.

Daninski · Post by **Daninski** » January 26th, 2009, 12:05 pm

Quote, Everything shrinks in the cold, unquote. It's true. I had that problem at the beach once.

shameem · Post by **shameem** » January 26th, 2009, 12:24 pm

Daninski wrote:Quote, Everything shrinks in the cold, unquote. It's true. I had that problem at the beach once.

This one's for you Dan- http://www.ananova.com/news/story/sm_1937986.html" onclick="window.open(this.href);return false;

Daninski · Post by **Daninski** » January 26th, 2009, 12:28 pm

Ha Ha Ha, thanks. Just what I needed shameen. When I saw your name on this post I was expecting a link to the on-line manual. Are you breaking with tradition now. lol

Newfie_dan · Post by **Newfie_dan** » February 10th, 2009, 5:48 pm

ok I found the problem after replacing the IAC/ t/b (thx for the deal daninski), the intake boot had a nice hidden crack in it. The first rib from where it connects to the vam had a crack right at the base of the raised rib where it was nice and out of sight. It must have been open just enough when the car was cold to cause the idle issue. I was a lil ticked to say the least. Well either way I recommend Daninski for buying stuff of. He gave me a good deal on the complete t/b.

MX-3.com

Odd Iac operation

Odd Iac operation

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