You must get the code read from the OBDII port using a code reader or scan tool device. The code will define your problem as reported by the on board computer (PCM) and will almost always give you a solution for the fix immediately.
www.trailvoy.com All the answers for you Envoy or Trailblazer (GMT360 platform)
take to your local dealer for diag.
My car when slow stop engine
Yes
There are pages and pages and items that can cause a check engine light. You need to have it checked for codes with a scan tool. After repair light can be shut off with scan tool.
The 2003 GMC Envoy inline 6 engine does not have a timing belt but a timing chain. No need to replace anything unless the chain breaks.
The service engine soon means the same thing for all cars. It means that you have some trouble with your engine and you should see a mechanic A.S.A.P.
The 4.2 liter engine requires seven quarts.
Have vehicle scanned to determine the problem and have codes cleared
How do I reset the service engine light on a 2003 Chevy Trailblazer?
have vehicle scanned to determine the problem
The thermostat housing is on the drivers side of the engine. It is where the bottom radiator hose connects to the engine.
It should be at the very top near the back of the engine. Just to the right side of the "Vortec" cover on a 4.2 engine.