My 2002 GMC Envoy is loosing power. It struggles to get up hills and now needs to downshift on hills it easily climbed before. It also takes about 3-4 seconds of cranking to start instead of the previous 1/2 second.
Just got my envoy back from the shop . it was loosing power strugling up hills,the thought it was the throtle body but it was infact the cat/conv,causing the throtle body to open up.yes it fixed the prob,but the converter aint cheep,go with factory part not aftermarket.the after market causes u more problems in long run
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Have you checked out your air filter? Has your 02 GMC Envoy had a tuneup? Also you may need to replace your fuel filter as well. (especially if you drive in a dusty area) A vehicle as new as yours still needs preventive maintainence to keep the "new" parts working properly. While this won't stop the components from eventually breaking down and causing you headaches, its still a good idea to check these things.
This is a hard question to answer without more information. If the vehicle has a sensation of slipping it is usally the automatic transmission that is at fault and it probably has to be rebuilt. The sensation of power loss could be from the slipping transmission. Try manually downshifting the trans. to a lower gear when going up a hill and see what happens. That can tell you if the problem is the trans, or the engine,
I ran into this concern with my 2002 and my wife ran into the almost identical problem with her 2003. this may sound silly,, but it was the clutch fan. Extreme loss of power from time to time came first. Then a roar of the what seemed like the engine when stopping. Actually cut off after it started to roar at highway speeds, and had absolutely no excelleration from time to time. Sometimes all of the symptoms completely went away. After taking mine to the dealer several times, finally they got it right and replaced the fan clutch. When my wifes 2003 SLt started doing the exact same thing as my 2002 had done, we both knew what the problem was, and the dealer did a quick fix. $600.00. Perhaps this should have been a recall feature, but never was. Everyone that I know that has an envoy, somewhere around the 72,000 and 103,000 mile mark has had this problem and have had to have the clutch fan replaced. It may sound like the vehicle is going to have to be junked,, but that is all it needs.
I also have an '04 Envoy XL. The problem we had was very similar. The truck lost power and the wife and kids were stuck on the interstate. It was the catalytic converter totally clogged. We were told by our trusted mechanic that we were lucky not to have blown a head gasket from the back pressure. Two days after having the converter replaced the check engine light came on. I went to Autozone to have the codes read. I don't remember the code number but it was basically that the thermostat was stuck open and the engine was running too cool causing it to run rich and clog the converter. I did not get a light until after and the light went out on it's own. I hope this helps you. GOOD LUCK!
That code represents a lower than expected reading for temperature (coolant). First thing to do is check your coolant level, as if it is low, then the sensor can not read correctly. Second, you may have a thermostat that is stuck open, allowing the coolant to cool off too much. The sensor should be mounted on top of the engine, near the thermostat housing.