[Diy_efi] Out of the blue high idle

[TomQ]

Ok I replaced the TPS and the IAC and it didn't fix the problem. What was
interesting is when I drove it to the store to pick up the parts the idle
seems to have fixed itself after the motor warmed up a bit (say 15 minutes
of driving). If I let it cool all the way down (say 2 hours) the problem
comes back. More ideas? Any parameters I should check with ALDL?

-TomQ

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
Behalf Of Programmer
Sent: Wednesday, July 02, 2003 7:14 AM
To: List for general do-it-yourself EFI talk
Subject: Re: [Diy_efi] Out of the blue high idle


When the TPS fails, the new carbon track becomes the "auto zero" point. You
then end up with a high idle when the throttle is at rest. Replace your TPS.

Lyndon

----- Original Message -----
From: "TomQ" <zippy at tomquinn.com>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, July 02, 2003 12:35 AM
Subject: [Diy_efi] Out of the blue high idle


> Hi all,
>
> I have been running a GM '747 TBI system on my motor (4.2L I6) now for
about
> two years and it has worked great with no problems at all. All of a sudden
a
> few days ago when I started it up it started to idle way up at around 2500
> instead of 800. First thing I thought was maybe there is a leak in the
> intake somewhere. I looked it over the intake trac but didn't see anything
> with holes or cracks in it. I did replace two intake caps that looked
> questionable but that did not fix the problem. I am now getting an error
21,
> throttle position sensor too high. I am looking for advice on how I should
> start to tackle this problem.
>
> TomQ
>
>
>
> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
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