Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Welcome, and thanks for using Just Answer. I am Cam, and I will do my best to assist you. When you are finished please click on accept only if you are satisfied. I don't get paid unless you do.Please do not accept if you cannot leave positive feedback. I don't know if you are a tech or a just working on your own vehicle so we may have to fine tune the answer. I only know as much about your problem as you have told me in your post, so my answers will be based on what you tell me so please add all the details you can. About your vehicle, How about the fuel filter and fuel pump? What is the pressure? 99% of the time those 3 codes are together, it means the fuel filter is plugged or the pump is weak.
60-66 psi is the spec.
No, there is not a fuel pressure sensor so you need to get a tool to read the pressure from the port on the rear of the intake fuel lines. I am confident that you will find the pressure is low.
Nope, we need the actual pressure. The fuel trims do indicate the lean condition.
Wrong type. You need a higher pressure one.
Is that idling or just with the pump running?
That is too low. Pinch the return line and see if the pressure spikes over 75, if so, then replace the pressure regulator, if not then the pump and filter.
No, low vacuum should cause higher pressure.