GMC 98 k2500 quit and will not start

Tiny
GURJITSINGH
  • 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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Friday, August 24th, 2012 AT 11:41 PM

7 Replies

Tiny
ASEMASTER6371
  • EXPERT
  • 25,493 POSTS

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

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Friday, August 24th, 2012 AT 11:48 PM
Tiny
GURJITSINGH
  • MEMBER

I check the spark at each spark plug and it's got new coil too

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Saturday, August 25th, 2012 AT 7:28 PM
Tiny
ASEMASTER6371
  • EXPERT
  • 25,493 POSTS

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

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Saturday, August 25th, 2012 AT 8:10 PM
Tiny
GURJITSINGH
  • MEMBER

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

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Sunday, August 26th, 2012 AT 5:17 PM
Tiny
ASEMASTER6371
  • EXPERT
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There are tests for the injectors that can be performed with the scan tool.

Roy

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Sunday, August 26th, 2012 AT 5:37 PM
Tiny
GURJITSINGH
  • MEMBER

So u mean just hook the scaner and view data while turning the eng over

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Sunday, August 26th, 2012 AT 6:12 PM
Tiny
CADIEMAN
  • MEMBER

Ck the engine timing. The timing chain maybe bad.

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Sunday, August 26th, 2012 AT 9:28 PM

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