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Frustrating Misfire Problem

Kirkathon25

By Kirkathon25
in Ask A GM Technician

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Kirkathon25 Enthusiast

Kirkathon25

Posted
Posted

i know i have been talking about this but i realized i put my posts in the wrong topic.

 

i have an 02 gmc sierra 6.0L and i have been having an intermittant misfire problem for a couple of months now.

 

it started when i put bosch plugs in but i swapped those out for ac delcos with msd wires.

 

i have also replaced the pcv valve, the fuel filter and i cleaned the tbi and the maf.

 

i have disconnected the battery for an hour to see if it would reset, i have sea foamed it, i have run a few bottles of injector cleaner through it.

 

the service engine light is only on when the truck is off and when it misfires for a while it flashes for about 30 seconds and it stops (p0300).

 

it only starts to misfire when the engine is warm and it starts only while the truck is idling and it stops when i push the gas down and hold it. the fuel pressure is fine.

 

i really have no idea where to go from here and any help would be much appreciated.

Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted

I had this exact problem with a '00 Jimmy. I had narrowed it down to either the spider injector assembly or crank position sensor.

 

I got frustrated with the truck (former rental), & am parting it out now. GM really dropped the ball on those late model Blazers/Jimmys .. but that's another story for another day.

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