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1992 4.3 sierra wont start unless gas petal to the floor

6200 Views 7 Replies 5 Participants Last post by  Ethan
what could be my issue? it only starts when i have the gas petal all the way to the floor.
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Dang, sounds like you found your problem, sludge. That's never good. Sounds like you'll be doing a engine rebuild, or at least a header rebuild. I know the valve seals in these trucks are known to go bad if you don't take care of the oil on a regular basis.

When you take the valve cover off, it soundn't drain any oil, it sounds like the oil ports are clogged with sludge, hence, needing a engine rebuild, or a very good cleaning.
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