Question about 1994 GMC Suburban

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MOTOR MISSING LIKE NOT GETTING GAS OR SPARK PLUGS NOT FIRING I REPLACED FULE FILLTER AND CLEANED SPARK PLUGS BUT STILL MISSING

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Hello,
I would check and find the dead cylinder(s) and determine if its spark related or fuel. You can do this by removing the plug wires one by one with insulated pliers. Note: Pull the wires loose first with the engine off and take caution not to tear the boots. If you remove the plug wire and here an arc snap noise and it doesn't change the way it is running you know 2 things you have spark and it's one of the cyls that are missing. If thats the case look for a lack of fuel or bad compression. The injectors If this is a Vortec early stile it will have popet style injectors. The popets plug up and cuse a no fuel situation in that cylinder.
Check it out and let me know.
Roy

Posted on Nov 16, 2009

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If it gets worse at higher RPM, then I'd suspect the ignition coil. That's where the high voltage comes from that eventually goes to the spark plugs. I've seen this on engines with a single coil and a distributor, as well as engine that have "coil packs" and no distributor.

Posted on Nov 16, 2009

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