My 2004 GMC Envoy has been having trouble idling and shut off at a stop light today. Now the check engine light is on. I had the thermostat and sensor replaced over a week ago. Any suggestions??
REPLACE THE O2 SENSOR THAT IS RIGHT ON THE MANIFOLD!!! THIS SAME PROBLEM HAUNTED ME FOR OVER 3 MONTHS!!! HUNDREDS OF DOLLARS LATER IT WAS A STUPID O2 SENSOR!!! THE SAD PART WAS... THE O2 SENSOR WAS STILL READING WITHIN SPECS ACCORDING TO GM .... BUT THEY PUT A NEW ONE IN AND IT HAS BEEN PERFECT EVERY SINCE.... FOR 9 MONTHS NOW!!! LET ME KNOW... [email protected]
A common cause for stalling at idle is a "throttlebody" plugged with carbon. A simple De-Carbon service that cleans the carbon from the throttle plate and the IAC valve will almost always cure this condition. The check engine light will also give a clue to the system that is having a problem. Just because the code may be fora particular sensor, does not mean that sensor is bad. Sensor readings effect other systems in the truck. Suggest getting the codes read from the computer, and asking an exert here.......
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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.
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