Posted by jimg.allentown on September 30, 2015 at 16:35:21 from (173.49.143.208):
In Reply to: Truck again posted by Donald Lehman on September 30, 2015 at 15:11:47:
Well, not knowing much about where you are or what kind of truck we are talking about, I still have a few suggestions...
What code or codes are being generated? Some of the most difficult to diagnose are mixture codes and evaporative emission codes.
Many shops, dealers especially included, do not do the necessary diagnostic work prior to starting the shotgun approach. Sad but true.
I had a guy come to me about his check engine light. He told me that another shop told him he needed a fuel tank. Just conveniently, they had one in stock, and they would be happy to put it in for him for the measly sum of $1000. He did not want to spend that much money, so he asked me to check it out. It had only the "famous" gas cap code. I checked out the entire fuel system carefully. Found no obvious problems. So, I took a critical look at the gas cap. No problem found. So I looked CAREFULLY at the filler neck where the gas cap was meant to seal. Found a small crack. For a temporary fix, I applied some epoxy to seal the crack. So far, 3 weeks and no more codes. Another guy was getting a lean code. I found that the upper intake manifold gaskets were just plain shot. Found that spraying some carb cleaner around. So, it should not be a major expense to diagnose or repair.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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