Engine code,fuel pressure,bad fuel,o2 sensor, map sensor, coolant sensor and so on
with scanner look read data to see data out of range . code will set only for short to ground or open circuit
hope it helps
SOURCE: 2004 GMC Envoy has trouble idling
Try the fuel filter. Sounds like the engine might be running rough due to weak fuel pressure. Its cheaper to replace, especially if it's still original from 04. Try running some injector cleaner through a couple of tanks of high octane gas.
SOURCE: battery removal on a 2004 GMC Envoy
The battery is on the right side behind the fuse box. You need a metric set to undo the 3 screws. Theres one that attaches to the body, one to the bar that goes along the top, and theres one on the left side below the vacuum hose and air induction. After you've taken out those three, you should lift the whole thing out(battery and shroud) together. It's hard to take the shroud off before you lift the battery out. After that, you have to pry the shoud off the battery. The two terminals in the back make it hard. Then just go to any auto parts store and they'll give you a new one.
SOURCE: Speedometer on 2004 GMC Envoy not working. It
There is a recall on the panel Cluster... call your dealer and have it checked out.. mention the recall... www.lemonauto.com
SOURCE: 2004 GMC Envoy rear hatch complete door wont
door lock actuator solenoid ( inside of door) needs to be replaced
SOURCE: what is the best type of motor oil for 2004 GMC
this engine calls for any major brand 5W20W (I prefer Valvoline), in very hot climates u can use 10W30W, but no heavier.
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