Mechanics

98 K2500 QUIT AND WILL NOT START

1998 GMC Sierra • 120,000 miles

We check the fuel pressure it's got over 55 psi and all plugs ahve spark and we check the compresin test one cylender have 30 psi every other one have 120+ it's turning over no start not quitly with starter flud any help plz change used pcm didn't help check spark plug and clean them they r geting fluded
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Gurjitsingh
August 24, 2012.



30 lbs is no good. You have a bad cylinder.
Put your old pcm back, used ones never work.

Where did you check for spark?
Roy

ASEMaster6371
Aug 24, 2012.
I check the spark at each spark plug and it's got new coil too

Tiny
Gurjitsingh
Aug 25, 2012.
It should start by what you are saying. It is difficult to see if the pcm is grounding the injectors because of the location of the injectors. A shop with a scan tool and verify if they are being triggered to supply fuel.

Roy

ASEMaster6371
Aug 25, 2012.
I know thats what I m thinking what is it wrong with it I check the injectors also have pause so I got scan tool then tell what should I check

Tiny
Gurjitsingh
Aug 26, 2012.
There are tests for the injectors that can be performed with the scan tool.

Roy

ASEMaster6371
Aug 26, 2012.
So u mean just hook the scaner and view data while turning the eng over

Tiny
Gurjitsingh
Aug 26, 2012.
Ck the engine timing. The timing chain maybe bad.

Cadieman
Aug 26, 2012.