Question about 2000 GMC Jimmy
Mack tool smart box brings up code P0507 idle speed high.
Things I tried: Replaced Throttle positioning sensor, cleaned idle sensoring unit, and replaced thermostat.
Some times the E.G.R. will stick half open. This will make the engine surge or have high idle. Try replaceing the E.G.R. located under the upper intake. Do not go with after market E.G.R. The spring in them are to powrefil and the E.G.R. wil not open. Also try replaceing the O2 sensors. This could give the engine more fuel thus a higher idle. Some vehicles the T.P.S. can be ajusted, do some checking to see if yours is adjustable.
Please contact me if your problem presists.
Posted on Feb 03, 2009
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