How would the TPS affect idle speed? From my understanding, it is just
a sending unit, meaning it can only give information to the PCM but
cannot receive and therefore manipulate any settings.

On Aug 13, 1:47 pm, Mike Romain > wrote:
> Will Honea wrote:
> > 97tjMike wrote:
>
> >> Hello Everyone:
>
> >> I have a 97 TJ and 95% of the time it idles perfectly. However, about
> >> 5% of the time, usually when the vehicle has been run for more than 20
> >> minutes or so, the idle in neutral or park will shoot up to between
> >> 1200 and 1500 RPM. The only way to get it to stop is to put the
> >> vehicle into gear or to restart the car. If I restart it, it will not
> >> happen for a while, but it eventually comes back. The TPS was recently
> >> replaced, and I just replaced the idle air control valve, thinking
> >> this may have been the problem, but it still has the same effect. I'm
> >> thinking now that it may be the coolant temperature sensor (something
> >> wacky when the engine is hotter making the vehicle run at higher
> >> speeds??). Any suggestions? I'm hoping its not my computer...
>
> > Clean the TPS connector. Go to an electronics parts store and buy some
> > contact cleaner or WD40 works. Disconnect the TPS, clean, connect and
> > disconnect several times, blow dry, then use some dielectric grease on the
> > the connector seal ring to keep moisture out.
>
> Yup, replacing parts only cleans 'half' the connection.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's - Gone to the rust pile...
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