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GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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Chevrolet Silverado 2500: I have a 08' 2500HD 6.0 liter. I

Customer Question

I have a 08' 2500HD 6.0 liter. I bought it used. The check engine light was on when purchased and showed burning rich on both exaust. There is no misfire, the O2 sensors are good as well as as the intake sensor.
What would cause it to run rich. Especially when under heavy loads? Another thing is that if you put it tow haul it shifts really crazy.
Submitted: 2 years ago.
Category: Chevy
Expert:  Roy replied 2 years ago.
good evening my name is ***** ***** I will assist
what are the codes??
how did you check the O2 sensors???
can you read the long term trims from the O2 sensors???
rich condition can come from high fuel pressure, leaking fuel pressure regulator, injectors dripping or a mass air flow sensor.