Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hello, my name is***** you for the question. Can you tell me if the check engine light is coming on? How many miles are on it? Does it do this every time you drive it?
Thanks for the response. Most of the time this is caused by the timing solenoid pack. It is prone to failure especially if the oil is somewhat dirty. They would need to tear down the top of the engine to verify this. Most of the time if it is not replicated GM needs to get involved to approve this.
The solenoid pack is what changes the valve timing inside of the engine to help with efficiency and economy. If there is evena slight amount of oil bypassing the solenoids then it can cause a change in valve timing when it is not supposed to which causes it to run like this. The only other thing I have found is either dirty injectors, which is not really common or a programming issue in the computer. I would typically reflash the computer and clean the injectors first to see if it helps.
That is possible, but typically that would cause a misfire code just for that cylinder.
There is a bulletin for the AFM system, which is the system I am talking about. I would ask them if they have checked this out. I do not have access to the bulletin itself at the moment but I can get you the bulletin number.
It is PIP4568R. That should reference that bulletin.
This is a technical bulletin that dealers get from the manufacturer for common issues. The dealer can print it out for you. They should know exactly what I am talking about with this. I can send it over later also if you need it.
My normal system is down, but this is what I have right now. Keep in mind the ticking noise and check engine light does not always occur with this when it is subtle.