Question about 2003 GMC Sierra C/K3500

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2006 gmc 5500 8.1 liter propane

Esp when under load , feels like eng miss , no codes , im a ford tech by trade so im thinking maybe a coil pack going bad ,what is the correct way to test gmc coil packs and are there any other things to look for shouldnt it be throwing a code obd2 cant find 5500 on list so i put closest vehichal i could find thanks forvyour help

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Check with gm dealer on possible related bulletin for injectors

Posted on Nov 23, 2008

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2000 ford f150 4.2 eng. 5 speed has a miss when you give it gas


If it is a serious miss, you should have a code in the computer telling you which cylinder.
If you have replaced the ignition parts and there are no vac leaks, the next phase would be fuel including the injector.

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My truck is missing on the forth and fifth


things that can cause it to miss.
fouled plug (checked)
bad wires(checked)
coil pack(checked)
ignition signal to coil pack( switch old coil pack to a working cylinder to make sure its good and you may find a possible short in the wiring to the coil pack) alternately check the voltage to the wires going to the coils make sure like colors have like voltages. im not too big into ford trucks but thats a good start for most vehicles
possibly injector stuck open and flooding cylinders
timing could be off

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How do I find the spark plugs and plug wires so I can replace all on my 02 Ford Crown Vic (I have a skip under load)


I THINK I UNDERSTAND THE SKIP UNDER LOAD,LOL,BUT THIS CAR DOES NOT HAVE WIRES,IT HAS BOOTS,UNDER THE COIL PACKS,AND I HATE TO TELL YOU THIS,BUT,IF IT IS A 4.6 LITER,THEN,FUEL RAIL HAS TO BE LIFTED,GOOD LUCK

Apr 05, 2010 | 2002 Ford Crown Victoria

1 Answer

Ford mustang - year 2000 - 3.8 liter. The coil pack is out?


I replaced the coil pack to no avail. I also purchase a code reader while at the auto parts store. This device told me cylinder 3 was misfiring (P0303). I found that the spark plug wire had shorted out on the manifold sensor tubes. Replaced that wire and done.

I highly recommend keeping a code reader in your car tool kit. very useful.

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2004 GMC sierra 5.3 eng 1500 transmission shutter 40-55 mph


I too have that problem. I own a 2005 GMC Yukon. Shutters between 40 + 55 mph. I thought for sure the stumble I felt was a plug or coil pack because it only does it under a load. With A/C on the whole truck shakes! But it wasnt the plugs or coil packs. Answers anyone?

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