Question about 1994 GMC Suburban
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.
Posted on Nov 16, 2009
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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Posted on Jan 02, 2017
Tips for a great answer:
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not starting or turning over indicates towards multiple possibilities. It can
be issue with battery or weak battery. But if battery checks out ok, then it
can be starter issue or faulty alternator or problem with low fuel pressure or
no spark at spark plugs due to dirty spark plugs or faulty ignition
coil or injectors getting cracked or dirty and needs to be cleaned.
confirm the problem, the basic troubleshooting is required.
this link below and follow the troubleshooting:------
This will help.
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