Question about 2001 GMC Jimmy

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After battery in my 2001 jimmy manual 5 speed battery was run low till almost dead twice in 24 hour period, due to leaving key on too long while not running, it started after using jumper cables both times. After 10 minutes of driving, everything performing normally, when I put truck in neutral to coast, RPM's climbed to almost 3000. I pulled over, and after about 15 seconds it returned to 1 RPM line above normal. Same symptom kept occuring during approx 5-8 mile drive. Vehicle also just had a brake system flush after rear brakes were changed and rear passenger brake caliper was replaced. The brake system was flushed as a suggestion because the fluid was dark due to it being 10 years old. My friend said after driving it 50 miles the computers should reset and the idle will relearn itself. true? false?

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The reset rate for vehicle computers vary by manufacturer, but 50-100 miles sounds good for the relearning process. As with the RPM's climbing unexpectedly, as a precaution I would look for a vacuum leak under your hood... it will be a hissing sound around some rubber hoses, as this can cause the RPM's to fluctuate and possibly give check engine light codes.

Posted on Oct 07, 2010

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