Right now i'm driving my dad's 2007 silverado until i get my car back in two weeks. Since i've been driving it the CEL likes to come on under heavy acceleration, when the rpms go past 4500. The CEL will start to blink then it will shut off. The light came on yesterday and stayed on during a lot of highway driving i was doing. When i had the car inspected the other week, the CEL was on and i was told they were miss fire codes....but the CEL went away and would just blink under heavy acceleration. The car is a 2007 Chevy Silverado 2500HD 6.0L and it has 64k. i don't know much about these cars, so any advice would be appreciated.

 

What are the codes? Thats the key other than misfire, and thats generally coil pack. With acceleration, I'd guess either misfire, but could be a crank, or cam sensor also.

 

i don't know what the codes are...and the problem was when the CEL was on the scanner for some reason wouldn't work. i tried 3 scanners, and even when it was at the shop they had a hard time being able to read the codes as well

 

07Silveradooo,

I am sorry to hear that you are experiencing this issue. Did you take your dads vehicle to a independent or your local Chevrolet dealership?

Thank you,
Elizabeth, Chevrolet Customer Service

 

Usually a blinking CEL is a serious situation. Even if it comes and goes or only happens at certain times, its not good. Almost all of the time a blinking CEL is caused by a misfire code. If you continue to drive without fixing the problem is going to cause many more problems. Have the spark plugs even been changed? If not I would pull one and see what it looks like, that very well could be the problem.

 

sounds to me like you have a bad catalytic converter that's the reason it does it at high rpm's it's not burning the fuel off fast enough and with it doing that it's sending the wrong amount of emissions to the o2 sensor witch is telling it not to send the right amount of fuel and making it throw the misfire code