300ZX (Z32) Performance / Technical Discussions related to Turbo charging, Supercharging, Engine, ECU, exhaust, and etc. performance enhancements and Techical related.

High Idle

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Old Oct 29, 2006 | 06:54 PM
  #1  
domsgarage's Avatar
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Tough Guy
 
Joined: Nov 2003
Posts: 851
From: NJ
High Idle

Car idles at 2500 most of the time. Adjusting the idle adjuster all the way down makes it idle at 2000. It idles at 2500 almost all of the time which makes me think its a leak or something but to idle that fast it would have to be a big enough leak that I would assume id hear it.

I did some srpaying and it never stops of changes so I dont know whats up with that.

I disconnected the battery so it would reset but still nothing changed. It starts up normal, normally starting at like 1500 then only goes up from there sometimes revs by itself a few times before staying at 2500.

I just had the maintenance done on it, timing and all of that and I dont know where to go from here. Wassabi with this jim jam??

Last edited by Riz Z Speed; Oct 30, 2006 at 12:52 PM.
Old Oct 30, 2006 | 12:51 PM
  #2  
bardabe's Avatar
Bad Speller
 
Joined: Sep 2004
Posts: 1,832
From: Moreno Valley, CA
its definetly a vacum leak. look arround the engine bay there is alot of vacum in the VG so look arrund IM sure U'll fnind it. turnignt he screw is only going ot mask your problem.
Old Oct 30, 2006 | 01:36 PM
  #3  
ZLover4Life's Avatar
Encyclopedic Knowledge
 
Joined: Aug 2005
Posts: 3,316
From: Naperville, IL
You cannot definatively say it's a vacuum leak. In all honesty, I can almost guarantee it isn't.

In fact, I'm 99% sure it's a bad timing job, now that I realized you said you had the timing done recently.

Take an ignition timing light to it... I'm willing to bet that it's going to be jumping around. Your timing belt was put on poorly... probably a tooth or two off. This would cause fluctuating at first and then settling at a high idle.

How do I know? I've done it... I was a tooth off and had very similar symptoms.

Last edited by ZLover4Life; Oct 30, 2006 at 01:46 PM.
Old Oct 30, 2006 | 05:12 PM
  #4  
CanyonCarver's Avatar
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Joined: Jun 2004
Posts: 2,296
From: Acton, California
Not a vacuum leak. Besides ignition timing, check your TPS settings.
Old Oct 31, 2006 | 06:04 PM
  #5  
domsgarage's Avatar
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Tough Guy
 
Joined: Nov 2003
Posts: 851
From: NJ
It idled high even before I had the timing belt done, but im going to take a timing light to it tomorrow. I think it has something do with a vacuum leak becuase when I puch the break down the idle goes way down then it picks back up like the engine is compensating for a leak or something.
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