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1998 Jeep Grand Cherokee Repair Question


Topics covered: Engine, Battery, Body.
Mileage: 230,000 miles.

Asked on July 4, 2012

The rpms wont stay at idle in park or drive without my foot on the gas what would be the problem

I have replaced the crank postion sensor,throttle postion and control valve

Avatar Asked by ken44

Answer

Replied on July 4, 2012

base idle needs to be set or dirty throttle body.

Roy

Tiny Answered by ASEMaster6371 (expert)
24,825 answers provided
Replied on July 4, 2012

thank you for that info but how would i set the base idle

Tiny Response from ken44
1 question asked
Replied on July 4, 2012

Idle isn't adjustable on that engine. Was the battery recently disconnected or run dead?

Tiny Answered by caradiodoc (expert)
17,276 answers provided

Replied on July 4, 2012

yes it was recenttly disconnected to charge the battery and it was dead

Tiny Response from ken44
1 question asked
Replied on July 4, 2012

The Engine Computer lost its memory and has to relearn "minimum throttle" before it will know when it must be in control of idle speed. It also might not give you the normal "idle flare-up" to 1500 rpm when you start the engine. To meet the conditions for the relearn to take place, drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the brake or gas pedals.

Tiny Answered by caradiodoc (expert)
17,276 answers provided