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ZUKIWORLD Discussion Forum => Technical Discussion - Beginner / Repair => Topic started by: duckride379 on July 23, 2010, 07:48:15 AM

Title: 1992 16 Valve High Idle problem
Post by: duckride379 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

Title: Re: 1992 16 Valve High Idle problem
Post by: Skyhiranger 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/ (http://kick-fix.com/)

Title: Re: 1992 16 Valve High Idle problem
Post by: KJMac on August 15, 2010, 09:08:24 PM

I would look at the throttle position sensor too!

Title: Re: 1992 16 Valve High Idle problem
Post by: wildgoody on August 15, 2010, 09:14:48 PM

Have you checked out the EGR?

Title: Re: 1992 16 Valve High Idle problem
Post by: ovathedge on August 17, 2010, 09:57:32 PM

mine does it when its cold then fine once warm what could cause that?

Title: Re: 1992 16 Valve High Idle problem
Post by: wildgoody 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