Question about 1999 GMC Suburban

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Burb is missing. put new fuel filter in plugs,wires.may be water

Burb is missing. put new fuel filter in plugs, wires,may be water in fuel not sure.

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  • Zaraki May 11, 2010

    Did you install split-fire, or multi-spark spark plugs?

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  • GMC Master
  • 2,019 Answers

If one cylinder is missing at idle, it would be useful to know which one. Pulling the plug wires one at a time with insulated pliers would tell us if one does not cause a change.
It could be a fouled plug.
You could switch plugs with another, to verify.

If not spark, could be fuel.
If throttle body, then not likely.
If individual injectors, then pull whole rail off and see if all injectors fire, spray pattern like cone, and none dribbling.

If none of above, then consider intake leak, collapsed lifter, valve adj, etc.

Posted on Apr 22, 2010

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Posted on Jan 02, 2017

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Dumps raw gas into engine


Just a few things to check. Take off the fuel filter and make sure there is no water in it. If you have put in different spark plugs than AC Delco, then change them to AC Delco. If you haven't looked at the plugs or the fuel filter, then it is way past time to replace the filter and new AC Delco spark plugs only. These places that insist that you use Bosch plugs or split fire plugs don't know ****. The Delco plugs are made especially for your engine and will out last those cheap non-working Bosch plugs.
If the fuel filter and plugs don't fix it, make sure your air filter intake isn't stopped up with a bird's nest. Happens a lot. If it still misses after new plugs, you may have a fuel injector sticking.
The bad smoke is the gas-thinned oil passing the rings and unburnt fuel smoke. The missing really bad is most likely fuel soaked spark plugs. Make sure you change the oil while changing the plugs or you will have a redo. Let us know if any of this helps. Dale

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Are you sure that the plug wires are in the right order? Fuel filter, is there water in the fuel? Is the air filter and air intake clean and clear?

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