High Idle

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sphillips

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I would start simple, unhook the battery and clean the throttle body and maf sensors, reconnect the battery after one hour then go thru the idle relearn procedure:

1.) start it in park with all accessories off
2.) idle till you reach operating temp
3.) turn ac on max, idle for one minute
4.) put in d while still running and ac on, let it idle for one minute
5.) go for a short drive see if that changes your idle

Went thru these procedures, idles at 950, so slightly better
 

1955moose

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Glad you got your idle down. What brand did you buy that worked? It will help other members.


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sphillips

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Sorry about late response. IAC is from Rock Auto, made by Hitachi. BUT, nothing lasts forever, idle is back to 950-GRRRR!
 

1955moose

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Check one of the prior posts from one of our members.Doc Raymond, He had posted a way to test them if bad.


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sphillips

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Check one of the prior posts from one of our members.Doc Raymond, He had posted a way to test them if bad.


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Will do. Also, realized the car has adjustable pedals which were adjusted all the way towards the seat. Moved them towards the firewall and idle came down to 800. Coincidence?
 
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sphillips

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Well, its fixed, but not sure why, someone will have to explain this to me. $4 part and 10min fix. I replaced the PCV valve and now it idles at 650, doesn't roar to 1700 on start, about 1300rpm and drops right on down.
 

aircargoo

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i u\just seen this and had exact problem. i was going to inform you check your hoses ect....pcv valve leaking is like having a leak with a loose air filter. trucks idle goes up.pvc hose goes straight into throttle bodys rear/back....glad you found problem...
 
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