Question about 2002 GMC Envoy
As silly as this might sound, you more than likely disturbed a vacuum line or an electrical connector located near or under the battery. Check around for this and see what you find. If you removed the air intake duct make sure the clamps and connections are tight.
Posted on Feb 08, 2012
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Posted on Jan 02, 2017
Got a solution for you on this. There is a small sensor, called the MAP sensor.
It is located on the top of the engine. You will see a blue sticker with Delco Motors 5V GND written on it. Has a wiring harness that you can pry up and
pull off. Unplug the wiring harness and plug it back in. You may need to reset the code errors. I had mine at a mechanic, and he did that , reset the code errors and it solved the problem.
Posted on Oct 02, 2011
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