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1992 16 Valve High Idle problem

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Offline duckride379

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1992 16 Valve High Idle problem
« on: July 23, 2010, 07:48:15 AM »
I have a 1992 Sidekick with a 16 valve 4 cylinder. The biggest problem with this is the engine was put into the sidekick and I was told it only has 40-50K miles. I have no idea what year the engine is or where it came from. The guy I bought it from had it installed by local mechanics who I know and they knew it had a high idle but could not fix the problem. On a cold start it idles fine, once it warms up the idle ramps to about 1900-2000 RPMS and then starts surging from 1900 to 1200 up and down. Can anyone please tell me were to start to correct the problem. Thanks
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Offline Skyhiranger

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Re: 1992 16 Valve High Idle problem
« Reply #1 on: July 23, 2010, 06:58:52 PM »
Sounds like there is a vacuum leak once it warms up.  A vacuum leak will cause high/low/high/low idle.
It also could be a faulty sensor causing it.  I would start checking all the sensors to see if they test out good.
The following site has pretty good testing and troubleshooting info in it....
http://kick-fix.com/
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Offline KJMac

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Re: 1992 16 Valve High Idle problem
« Reply #2 on: August 15, 2010, 09:08:24 PM »
I would look at the throttle position sensor too!
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Offline wildgoody

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Re: 1992 16 Valve High Idle problem
« Reply #3 on: August 15, 2010, 09:14:48 PM »
Have you checked out the EGR?
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Offline ovathedge

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Re: 1992 16 Valve High Idle problem
« Reply #4 on: August 17, 2010, 09:57:32 PM »
mine does it when its cold then fine once warm what could cause that?
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Offline wildgoody

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Re: 1992 16 Valve High Idle problem
« Reply #5 on: August 17, 2010, 11:27:51 PM »
On an 8V engine it's the wax plug in the throttle body, but on a 16V
I'm not sure

Wild
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