Intermittent idle problem with 93 JGC
 

This is an annoying, intermittent idle problem with my
1993 Jeep Grand Cherokee (5.2L V8).

The engine will start just fine but the idle RPM will almost
immediately drop to zero with the engine of course stalling.

Giving extra gas in idle will not keep the engine running
for long. The RPMs swing up and down in a fight between
wanting to stall and the extra gas but it always stalls
out within a few seconds.

If I can get the transmission in drive and start moving
before the engine stalls, the engine behaves just fine
and I can drive as normally. Within a quarter
mile or so of running, I can even idle at standstill
with out problems.
However, if I turn off the engine, the idle problem will
very likely return immediately.

This problem is intermittent and it can go months with
no problems. When this problem occurs, it will
persist from one engine start to up to a few days.

I'm worried that one day soon I won't be able to get
it into drive and will be stuck.

Does this look like an idle flow sensor probelm?

Thanks for any help in this.

Intermittent idle problem with 93 JGC
 

buddog did pass the time by typing:
> This is an annoying, intermittent idle problem with my
> 1993 Jeep Grand Cherokee (5.2L V8).
>
> The engine will start just fine but the idle RPM will almost
> immediately drop to zero with the engine of course stalling.
>
> Giving extra gas in idle will not keep the engine running
> for long. The RPMs swing up and down in a fight between
> wanting to stall and the extra gas but it always stalls
> out within a few seconds.

Odds are your idle air passage and idle air solinoid are
all crudded up. Grab a can of O2 sensor safe throttle body
cleaner and clean the idle air passage.

ref, the I6
http://revbeergoggles.com/tb/tb.html

Also it could be fuel pressure, how long has it been
since you replaced the fuel filter?

--
DougW

Intermittent idle problem with 93 JGC
 

In article <BIc5g.6038$8q.5267@dukeread08>, DougW wrote:
>
> Odds are your idle air passage and idle air solinoid are
> all crudded up. Grab a can of O2 sensor safe throttle body
> cleaner and clean the idle air passage.
>
> ref, the I6
> http://revbeergoggles.com/tb/tb.html

Thanks. I'll try that.

>
> Also it could be fuel pressure, how long has it been
> since you replaced the fuel filter?

I bought the Jeep a year ago so I have no idea when if ever.

Intermittent idle problem with 93 JGC
 

Clean both the Throttle Position Sensor and Idle Step Motor,
responsible for your idle speed:
http://members.cox.net/wilsond/tb/tb.html
God Bless America, Bill O|||||||O
http://www.billhughes.com/

wrote:
>
> This is an annoying, intermittent idle problem with my
> 1993 Jeep Grand Cherokee (5.2L V8).
>
> The engine will start just fine but the idle RPM will almost
> immediately drop to zero with the engine of course stalling.
>
> Giving extra gas in idle will not keep the engine running
> for long. The RPMs swing up and down in a fight between
> wanting to stall and the extra gas but it always stalls
> out within a few seconds.
>
> If I can get the transmission in drive and start moving
> before the engine stalls, the engine behaves just fine
> and I can drive as normally. Within a quarter
> mile or so of running, I can even idle at standstill
> with out problems.
> However, if I turn off the engine, the idle problem will
> very likely return immediately.
>
> This problem is intermittent and it can go months with
> no problems. When this problem occurs, it will
> persist from one engine start to up to a few days.
>
> I'm worried that one day soon I won't be able to get
> it into drive and will be stuck.
>
> Does this look like an idle flow sensor probelm?
>
> Thanks for any help in this.