Question about 1999 Ford Expedition
The throttle position sensor has a small amount of adjustment in it. The plastic case has a slight slot in it. On the opposite side of the TPS on the air horn you will see a throttle stop with a hard to move screw. You need to get some play on that screw to have slack to adjust the TPS. I think it was good for 100+rpm at base idle.
This may help you, but check you EGR for diaphram and carbon buildup.
Posted on Jun 28, 2009
Check the pcv vale going in to back of intake it may be broke or has a hole in it .this has happend on quite a few i worked on .this is one of fords better ideals .the part at advance auto parts is 18.00
Posted on Mar 01, 2010
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Posted on Jan 02, 2017
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