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TimT TimT is offline
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Join Date: Mar 2002
Location: Wantagh, NY
Posts: 7,417
The sensor on the manifold is an IAT inlet air temperature sensor.

The sensor in pic 4 is a TPS throttle position sensor.. It looks to be a generic GM sensor. Also it looks like someone welded a D to the throttle shaft so the GM sensor can be used.

Check all the connections, and check the resitance of the TPS it should vary with position. Dont think I have ever seen a failure of a TPS

If the TPS is shot, and happens to not be a GM part, you can always use a generic GM part since you will have to recalibrate system for the new sensor, which is very easy to do
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Old 11-05-2010, 10:46 AM
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