[V8] Idle speed too high

Ingo Rautenberg ingo.rautenberg at gmail.com
Mon Jan 19 19:51:12 PST 2009

Hmm.  When you say that you lubricated the throttle rod/pivot  
assembly -- did you do front and back?  By front I mean at the  
bearing you can't see but can feel when you remove the throttle  
body.  This one really tends to dry up and should be lubed at the  
least or (preferably) replaced.


On Jan 19, 2009, at 10:29 PM, Ed Kellock wrote:

> Patient is my 91 5spd.  Idle speed is consistently a little too  
> high, like
> 1100.  Here's what I've done....
> -removed/cleaned ISV
> -adjusted TPS
> -opened up and cleaned throttle butterflies directly
> -lubricated throttle rod/pivot assembly (it was and is smooth and  
> returns
> to stop solidly)
> -went through everything again checking for vacuum leaks
> -checked cruise control for adjustment etc., no interference
> Initially I could lower it some by pushing down on the small lever  
> at the
> front and I found that I had the TPS adjusted so that it was  
> causing the
> throttle to hang open a bit.  I loosed the TPS, pushed down on the  
> level,
> backed the TPS off a little tiny bit more and snugged it down.  I
> confirmed it still returns to closed throttle position (click).
> The last thing I did was unplug the ISV and start the engine.  The  
> idle
> seemed right for a moment but then slowly climbed up to 1100.  It  
> seems
> like it's ECU or something.
> When I turn the engine off, there's a clack in the passenger side  
> fender
> well.  I know there's some emmissions shite in there, a reservoir  
> and a
> valve of some kind, but I don't know what it should/shouldn't do.   
> I am
> fairly sure I've never heard a clack from that area ever on any of  
> my V8s.
> Maybe I just never noticed.
> Thanks,
> Ed
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