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1999 Chevy Suburban my sub wont stay running

Tiny
HIPPIE7
  • MEMBER
  • 1999 CHEVROLET SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 107,438 MILES
Please help me idenify this prob the truck starts but only runs for 3 seconds then dies now the history my friend replaced the batt and the starter still wont stay running. Its just running on cold start fuel only checked fuel pressureand was at 39 psi so I replaced it with a carter pump and a updated elec plug. Now I have 55to64 psi and still the same problem. Now I have isolated it to a run problem. And not a the start system problem. And this is how I did that. I have a 1 quart pressure pot that I have filled with gas. I can disconect the pcv valve and manually spray gas in the manifold and it will stay running the only light that stays on when I do this is the security light. IT does not blink or flash just shines and smiles at me. PLease HELP find this problem as I am at my witts end TXs
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Saturday, April 4th, 2009 AT 12:32 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Are you maintaining fuel pressure and spark after the 3 seconds it runs? It sounds like the security system is shuting it down. I would recommend having that checked by a dealer that has the proper test equipment.
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Sunday, April 5th, 2009 AT 5:54 PM
Tiny
HIPPIE7
  • MEMBER
  • 2 POSTS
CAN I GET RID OF THE PASSLOCK SYSTEM BY WIREING AROUND IT?
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Sunday, April 12th, 2009 AT 2:21 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
To the best of my knowledge, no
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Tuesday, April 14th, 2009 AT 7:29 PM

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