wild rpm
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wild rpm
let me start over may not have explained the problem right. on average i start car and rpm goes to13 then drops to 9 or 10 until engine warms up then idles around 7.5 start driving and everything is fine take foot off pedal and rpm goes down- but sometimes i start car rpm goes between 14 or 15 and stays there until i turn off and restart also sometimes when driving you take foot off pedal and rpm will stay the same until braking then it will drop some have checked tps vacum timing iac binding of cables throttle body also have cleaned maf and throttle body have pulled on hoses looking for leak that could come and go at a complete loss whats next any help will be great
Racer
Joined: Sep 2014
Posts: 429
Likes: 28
From: Brooklyn, MI
let me start over may not have explained the problem right. on average i start car and rpm goes to13 then drops to 9 or 10 until engine warms up then idles around 7.5 start driving and everything is fine take foot off pedal and rpm goes down- but sometimes i start car rpm goes between 14 or 15 and stays there until i turn off and restart also sometimes when driving you take foot off pedal and rpm will stay the same until braking then it will drop some have checked tps vacum timing iac binding of cables throttle body also have cleaned maf and throttle body have pulled on hoses looking for leak that could come and go at a complete loss whats next any help will be great
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
I would spray tb cleaner up/down vac lines, around egr/etc. if you have a vac leak, this should find it. Also disconnect the cruise cable to see if that cures it. I have to "bump" my 85 occasionally to get it down...should be running abouy 650 when stopped.....Have you tried the min idle adjustment? You also didn;t mention if you timed it....good luck
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
Sounds like a bad IAC to me, or the pintle may be extremely dirty and sticking..If you hook to a scanner you can see if it's working properly while the car is running...The fact that it's intermittent could mean it's dirty and just sticking..WW
Last edited by WW7; Mar 28, 2015 at 09:09 AM.
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thanks for info will try these things see where it goes
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Joined: Jan 2011
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ok not sure yet but found a hose about 1/2 in goes from valve cover to throttle body that wasnt sealed good put some clamps on it and car seams to run alot better will do some more testing tomorrow but sure looks good thanks for all the help
