[Diy_efi] Out of the blue high idle

[Robert Price]

Sounds like your Throttle position sensor is bad or maybe the IAC had gone 
bad. Check to see if the IAC is moving If it is then I would say your 
Throttle position sensor is bad.

Bob


From: "TomQ" <zippy at tomquinn.com>
>Reply-To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
>To: <diy_efi at diy-efi.org>
>Subject: [Diy_efi] Out of the blue high idle
>Date: Tue, 1 Jul 2003 23:35:52 -0700
>
>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
>
>
>
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