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-   -   2003 Jeep 4.7l HO idle issues (http://www.jeepgarage.org/f203/2003-jeep-4-7l-ho-idle-issues-39148.html)

360ramsst 03-18-2012 01:11 PM

2003 Jeep 4.7l HO idle issues
 
My 2003 Grand Cherokee has issues wit idling. When the engine is warm it will rev up to 2000-3000 rpms. It even does this when driving on the Highway. Is it the Idle Sensor?

Heelsparky0501 03-18-2012 06:32 PM

Re: 2003 Jeep 4.7l HO idle issues
 
Maybe try cleaning your iac, Are there any fault codes popping up?

Frango100 03-18-2012 06:32 PM

Re: 2003 Jeep 4.7l HO idle issues
 
Most of the time the problem is the TPS sensor, which sends the throttle position to the PCM. If you have a scanner whith realtime data, you could see the TPS in idle. On mine its around 12% and steady. When its much higher or fluctuating, probably the TPS is shot.
The idle air control stepper motor when not working right, normally doesn't give such high rpm.

2005JGC 03-18-2012 07:27 PM

Re: 2003 Jeep 4.7l HO idle issues
 
Quote:

Originally Posted by Frango100 (Post 596097)
Most of the time the problem is the TPS sensor, which sends the throttle position to the PCM. If you have a scanner whith realtime data, you could see the TPS in idle. On mine its around 12% and steady. When its much higher or fluctuating, probably the TPS is shot.
The idle air control stepper motor when not working right, normally doesn't give such high rpm.

This ^

seems almost 9 times out of 10 a 4.7l with an idle concern is the throttle position sensor.


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