Question about 1997 GMC Sierra

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After adjusting valves due to replacement of #8 exahust valve moter won't start it tries to poof but thats it , so i kept at it trying to start it and it started up but shook preetty bad are my valves too tight ? truck sat 5 yrs fresh gas fuel pump works good new tank ,filter, pump strainer plugs wires , sensors tps , egr,temp both all new and now no start it has gas gets , has weak spark but has started and run for 5 minutes then shuit off no start now it is an 1987 gmc 2500 has 64,000 miles on it was stored for several years got good deal or did i paid cash 400 .00

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Sounds like the timing went out. You will need to re-adjust it. Its very common when removing the overhead cam to mess up the timing if it was not put back in place in the exact position needed. Get a timing light, or rent one and a book to see how to reset the timing.

Posted on Oct 10, 2010

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