1997 GMC Yukon

1997 GMC YUKON
140,000 MILES • V8 • 2WD • AUTOMATIC
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ED HARRIS
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I recently did a cylinder head repair job at home to fix coollant in the crankcase problem. I believe now that it must have been a blown head gasket coupled with poor factory milling on the left bank. After reassembly I seem to have a timing problem that will allow the engine to rotate very fast and not start. I have eliminated the spark and fuel as being the problem. so now my attention turns to the timing and compression. What could I have done that screwed up the timing or compression that bad. Could it be valve lash?
Apr 11, 2008 at 4:20 PM
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BLACKOP555
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remove the spark plugs on the cylinder you just messed with, does that make it crank faster?
if not it is probably a bad Crank shaft position sensor, assuming everything was hooked up properly.
Apr 11, 2008 at 7:22 PM