GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hi, thank you for posting your question to Just Answer. I am John, an ASE Certified Auto Technician with over 45 years of real world experience in dealerships and the aftermarket. I was the owner/operator of a facility for 20 of those years. So I am confident we can resolve your problem together. Please remember I do not know your skill level. I cannot see, smell, hear, or touch the vehicle so it may take a few back and forth replies or a phone call to get to a satisfactory resolution. I will make every effort to get you all of the information you may need with the expectation you will give me a positive rating once you are satisfied. Please be aware that I am usually working with a few people at a time so occasionally it may take a few minutes to respond.
This is a throttle body 2.5 engine?
I have attached a document that will help you verify if the timing marks are set correctly. If they are than we should be able to run through some basic diagnostic tests to isolate the problem OK.
That information is usually not found in repair manuals, although it might be found with the manufacturer of the camshaft. Which camshaft did you install and where did you purchase it from?