Question about 1998 GMC Sierra

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1998 gmc 1500 p/u, 4.3 vortec. Will not start. No codes, good fuel pressure and spark

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I assume it is cranking. So if you have gas and fire, we're down to timing, right? Or do you have security light on? Not sure what anti-theft system you have but some only shut off injectors. If no security light, you might have to pull the timing chain cover to check valve timing. Any questions or comments, please reply.

Posted on Sep 08, 2010

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Hi, is the engine turning over at speed or sluggish: charge battery. probly the carburetter jets are blocked. if has this been lay ed up for a while, or WATER IN THE CARBURETTER BOWL. you need to put an egg cup full of petrol into the carburetter to check: if all mechanical parts, ignition, earths, clean spark plugs (is spark plugs oily) meaning rings worn, valve stem seals worn, WET spark plugs will not fire up engine. i hope this is usefull. gerry

Posted on Sep 08, 2010


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