SOURCE: 2002 GMC Envoy
If your 2002 gmc envoy or sierra will not even turn over with a kown good battery try starting it in nuetral then go back to park and try starting again. There is a park nuetral safety switch that can malfunction. Turn the key on then shift into nuetral, then turn fully to start.
SOURCE: Need firing order diagram for 2002 gmc envoy
one, five, three, six, two, four
The plastic intake should have this sequence molded into it somewhere, and even the corresponding cylinder numbers in front of their respective holes. Have fun, and thanks for posting on Fixya.com
SOURCE: 2002 gmc envoy shuts off when i turn on the ac whil ideling
If it does it when idling I would suspect an IAC motor (Idle Air Control). If it is opening too slowly the added air the motor needs will not be supplied fast enough and the engine will kill.
It could be other things also but this is where I would start.
SOURCE: My 2002 Gmc Envoy is stuck in 4wheel low. I
Try disconnecting the battery for a few minutes, that might get you out of trouble for now. There are some common problems with these 4wd systems. Most common is the mode position sensor on the encoder motor. Sometimes it can be the switch on the dash. Fact of the matter is I can't tell you what is wrong without using a scantool to retrieve the fault codes from the computer controlling the 4wd.
SOURCE: My 2002 GMC envoy 4wd switch lights do not light
no, you may have a bad switch or 4wd module,i ve done afew that had bad switches, but i would check it before just replacing it,
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