Having problems with your 2004 GMC Envoy ?

ERRACTIC RPM I HAD MY THERMOSTAT REPLACED ON A 04 GMC ENVOY XUV 4.2L BECAUSE MY CHECK ENGINE LIGHT CAME ON. I TOOK IT TO AUTOZONE AND THE CODE STATED THAT WAS THE PROBLEM. ON THERMOSTAT WAS REPLACE THE BATTERY WAS DISCONNECTED-RECONNECTED TO RESET COMPUTER. NOW WHEN THE A/C OR THE DEFROST IS ON, I NOTICE THE THE RPM GAUGE WOULD BE VERY LOW AS THOUGH THE CAR IS LOSING POWER-THEN IS GOES UP! SO THE RPM GOES UP AND DOWN WHEN THOSE COMPONENTS ARE ON. WHAT COULD BE THE PROBLEM. THANKS!

Posted / edited by AnonymousUser on : 20-09-2021

Answers :

Clean your throttle body. Once the battery is disconnected and the computer reset, it no longer increases power to make up for a dirty throttle body. Get a $4 can of carb cleaner. If you go to a mechani9c they will tell you that it is the ac compressor.
Repair Help & Product Troubleshooting for 2004 GMC Envoy

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