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From: pinkbumblebee on 15 Apr 2007 21:12

Last year the 1999 Jeep did the same thing. Took it to the mechanic and
they said it was the throttle control value. They also replace the
spark plug wire and plugs with a turn up along with the throttle
control value.. The Jeep ran good for a year, then started doing it
again. When you start the Jeep up it runs good for about 30 seconds
then it run real rough. Clears up for a few minutes, then when its
totally warm, it runs rough again. Took it back into the shop and they
said nothing showing on computer read out. They said they dont know
whats wrong maybe its the (Brain Box) but they are not sure. Told us to
take it to a Jeep dealer. Any suggestions or help would be very
appreciate before I go anywhere else and lose money :uhoh:

Thank You
Gary and Gayle Siler


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From: Mike on 15 Apr 2007 21:58

"pinkbumblebee" <pinkbumblebee.2p3zfd(a)no-mx.nodomain.com> wrote in message
news:pinkbumblebee.2p3zfd(a)no-mx.nodomain.com...
>
> Last year the 1999 Jeep did the same thing. Took it to the mechanic and
> they said it was the throttle control value. They also replace the
> spark plug wire and plugs with a turn up along with the throttle
> control value.. The Jeep ran good for a year, then started doing it
> again. When you start the Jeep up it runs good for about 30 seconds
> then it run real rough. Clears up for a few minutes, then when its
> totally warm, it runs rough again. Took it back into the shop and they
> said nothing showing on computer read out. They said they dont know
> whats wrong maybe its the (Brain Box) but they are not sure. Told us to
> take it to a Jeep dealer. Any suggestions or help would be very
> appreciate before I go anywhere else and lose money :uhoh:
>
> Thank You
> Gary and Gayle Siler
>

You just had the plugs and wires replaced last year but how many miles
have you driven since then, it may be time for a tune up. You need to find a
shop that knows what they are doing. You need to hook up a scan tool that
can read sensor values when the problem is occuring. That should allow a
decent shop to determine what the problem is.


From: pinkbumblebee on 16 Apr 2007 08:36

Thanks you the reply Mike.

Actually we had the Throttle control value replaced last year along
with a tune up. It may have to go to a dealership for the value and
sensor test. We only put around 15,000 on it last year.

Thanks for your suggestion!!


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From: Mike Romain on 16 Apr 2007 09:48
When the throttle position sensor (TPS) gets out of whack on a Jeep, it
is normally corrosion on the plug and socket, same for the CPS or crank
position sensor. The connection is so shaky on the CPS that one fix is
to bypass the plug with a solid soldered or crimped connection.

When your TPS was changed, that only cleaned 'half' the plug and socket
combo so it lasted for a little while. We were told ours was dead by
Jeep back about 8 years ago. It is still in there after a few cleans of
it's connection.

I recommend a spray contact cleaner you get from electronic shops for
all the computer sensor plugs on the Jeep. The ones on the throttle
body (TPS and idle control valve (IAC)) need it about every two years
on ours and it only takes 30 seconds to clean them. WD40 will work in a
pinch for cleaning the contacts, but the real stuff is better. I finish
with a smear of dielectric grease on the plug's seal skirt.

It is a cheap try anyway.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
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pinkbumblebee wrote:
> Last year the 1999 Jeep did the same thing. Took it to the mechanic and
> they said it was the throttle control value. They also replace the
> spark plug wire and plugs with a turn up along with the throttle
> control value.. The Jeep ran good for a year, then started doing it
> again. When you start the Jeep up it runs good for about 30 seconds
> then it run real rough. Clears up for a few minutes, then when its
> totally warm, it runs rough again. Took it back into the shop and they
> said nothing showing on computer read out. They said they dont know
> whats wrong maybe its the (Brain Box) but they are not sure. Told us to
> take it to a Jeep dealer. Any suggestions or help would be very
> appreciate before I go anywhere else and lose money :uhoh:
>
> Thank You
> Gary and Gayle Siler
>
>
From: Scott Dorsey on 16 Apr 2007 10:39
Mike Romain <romainm(a)sympatico.ca> wrote:
>When the throttle position sensor (TPS) gets out of whack on a Jeep, it
>is normally corrosion on the plug and socket, same for the CPS or crank
>position sensor. The connection is so shaky on the CPS that one fix is
>to bypass the plug with a solid soldered or crimped connection.
>
>When your TPS was changed, that only cleaned 'half' the plug and socket
>combo so it lasted for a little while. We were told ours was dead by
>Jeep back about 8 years ago. It is still in there after a few cleans of
>it's connection.
>
>I recommend a spray contact cleaner you get from electronic shops for
>all the computer sensor plugs on the Jeep. The ones on the throttle
>body (TPS and idle control valve (IAC)) need it about every two years
>on ours and it only takes 30 seconds to clean them. WD40 will work in a
>pinch for cleaning the contacts, but the real stuff is better. I finish
>with a smear of dielectric grease on the plug's seal skirt.

And, if the connection ISN'T bad, a smear of dielectric grease will help
keep it from going bad.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
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