GM Repair Problems? Ask GM Repair Expert Now.
Hello, my name is***** you tell me how the vehicle is actually running?
Thank you. A rich condition is typically caused by too much fuel or not enough air. The most common cause of this is a dirty air filter. If the air filter is fine then it may just be getting too much fuel. Do you know if this is a fuel injected or carb model?
Thank you. I would definitely check the air filter. If the air filter is fine then it more than likely just needs to have the carb mixture adjusted.
The air injection valve can be an issue, but that will typically affect NOX emissions also, but not always. If the air pump is bad or the diverter valve were bad then that would cause it, but if it was just the air injection valve that would usually cause a backfire also.
No problem. If you need any further help please let me know. Otherwise have a great rest of your night.