Fred V.

Hi group

Found the problem. I took off the hose from the air
cleaner to the throttle body and found
the throttle plate very dirty. After a thorough cleaning the idle went way
up. This was probably from me fooling with the base idle screw over the
years. Then I cleaned the idle air bypass valve (also very dirty but not
stuck). Finally I reset the base idle and TPS voltage. Now the motor purrs
like a kitten!.

Fred

"Fred V." <fredvp@sbcglobal.net> wrote in message
news:fgipf.4036$rq3.2678@newssvr19.news.prodigy.com...
> Hi
>
> Lately my check engine light has been coming on for short periods. It
> comes
> on, then goes away, then comes on again. Otherwise the car runs fine. What
> could it be?
> KOEO test: on-demand codes: 21 and 24
> continuous code: 31
>
> Fred
> 89 LX 5.0
> 98K miles
>
>
>

 

fireater

Fred V. wrote:
> Hi group
>
> Found the problem. I took off the hose from the air
> cleaner to the throttle body and found
> the throttle plate very dirty. After a thorough cleaning the idle went way
> up. This was probably from me fooling with the base idle screw over the
> years. Then I cleaned the idle air bypass valve (also very dirty but not
> stuck). Finally I reset the base idle and TPS voltage. Now the motor purrs
> like a kitten!.
>
> Fred
>
> "Fred V." <fredvp@sbcglobal.net> wrote in message
> news:fgipf.4036$rq3.2678@newssvr19.news.prodigy.com...
>
>>Hi
>>
>>Lately my check engine light has been coming on for short periods. It
>>comes
>>on, then goes away, then comes on again. Otherwise the car runs fine. What
>>could it be?
>>KOEO test: on-demand codes: 21 and 24
>>continuous code: 31
>>
>>Fred
>>89 LX 5.0
>>98K miles
>>
>>
>>
>
>
>
never adjust the idle screw!!! this messes with the tps voltage at idle.
When a (older) ford idle starts to act up clean the throttle
plates!!!!!!!!!!