Question about 1999 GMC Suburban

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I got a 1999 gmc suburban and the number 6 spark plug keeps fouling out replaced the injector what could be the problem

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I had the same problem. To see if it was a bad a wire, I switched the spark plug wires on #6 and 8. Haven't had a problem since. I think it might have been the plug wires being re-seated when I swithced them took care of it.

Posted on Nov 10, 2009

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What is it fouling with. If its fuel check spark and plug--if it's oil-more serious- could be valve guides or seal or worse could be an oil ring. Either way it is going to be expensive.

Posted on Jul 25, 2009

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Spider injector replaced and no start


my thinking is when the engine backfired maybe one of the valves got bent and is now hitting a piston and keeping the engine from turning over or a rod may of gotten bent/broken. you could try taking all the spark plugs out than try rotating the engine backwards if it moves backwards try moving it forwards and see if it stops in the same spot if it dose than it is likely either a valve or the rod if you have something to look inside the engine throw the spark plug hole try to see if a valve is bent and try to see if all the pistons are all moving up and down the same amount. you may be able to tell if the pistons are moving by putting a rod throw the spark plug hole against the piston and trying to rotate the engine in either direction and see if the rod moves the same for all the pistons.

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Hi, I see you have changed a bunch of items, but do we know if the engine is getting fuel pressure? (55 psi at test port), or getting good spark? Could the spark plugs be fouled?I think before you replace too many items, you should start with basics. Good luck, Thanks...

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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.

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1 Answer

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You need a scanner to look at fuel and spark parameters. Bad coil or injector Take it for a drive while someone scans it

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Fouling occurs when the spark plugs' firing tip becomes coated with excessive fuel, oil, or combustion deposits so that it is unable to produce a spark. A plug can become fouled from continuous low speed driving, improper spark plug heat range (too cold), improper timing (over-retarded), too rich an air/fuel ratio or an oil leak into the combustion chamber. A variety of self-cleaning features are designed into most plugs to reduce fouling.

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1 Answer

1999 GMC Suburban 350 wont run


Per your description, it sounds like you are missing an injector pulse from the ECM.
Check the under-hood fuse box and verify the "ECM1" fuse is good (12 volt supply to injectors).
With the key in the run position, verify you have 12 volts at an injector.
Barrow or purchase a "noid" light to verify you have an injector ground pulse from the ECM.
Let me know what you find and we can proceed from there.
Regards,

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