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1995 Chevy k1500 5

Tiny
KLAY
  • MEMBER
  • 1995 CHEVROLET TRUCK
  • 162,000 MILES
1995 chevy k1500 5.7l tbi. First thing in the morning start truck it runs for a few seconds then dies. Start it again and it runs a couple seconds then dies. This continues for a few minutes then the truck will stay running the rest of the day. Next morning starts all over again. Ive replaced oil pressure sending unit, pickup coil, ignition module, plugs and wires. A few weeks ago I replaced fuel filter, extremely dirty and the truck started up fine any time of day for a few days. Then it went back to the start die start die. Also checked fuel pressure. Undone fuel filter and with key on engine off was reading 10 psi.
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Thursday, February 28th, 2013 AT 10:48 PM

8 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Fuelpressure is ok, check for a vacuum leak undr the tbi unit, they tend to blow gaskets there. Uses choke cleaner and spray around it if it idles well or pick up rpm then you found it.
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Friday, March 1st, 2013 AT 12:24 AM
Tiny
KLAY
  • MEMBER
  • 5 POSTS
I just checked the fuel pressure again this morning and with the key on 10 psi. Start the truck with the gauge still hooked up, pressure goes to 11 for a couple seconds then the pressure drops off to nothing and a second later truck dies. Could this possibly be the fuel pump going bad?
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Friday, March 1st, 2013 AT 6:06 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Yes it should maintain 9-11 psi for tbi units. I found this in our tip section though so you might check this out as well.
This tip applies to 1989-1999 Chevrolet GMC trucks with all engines. If the vehicle doesn't start (but cranks), or starts and then stalls, and you have found there is power to the fuel pump when turning the key on for two seconds, which is normal, but no power while cranking the engine or with engine running, the most common cause is a deffective ignition module.

Originally posted for 1995 GMC Pickup C1500 5.0L
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Friday, March 1st, 2013 AT 6:12 PM
Tiny
KLAY
  • MEMBER
  • 5 POSTS
I have already changed ignition module. Earlier when I tested the fuel pressure again as soon as the truck would die fuel pump would kick on, truck would start again for a few seconds fuel pressure would drop to nothing and truck would die. Why is this just happening in the morning when the truck is cold?
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Friday, March 1st, 2013 AT 6:36 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Who knows but when cold it's oin open loop try replacing your coolant temp sensor see if that works. Scan for codes aby crossing A&B at aldl below lh side of dash
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Friday, March 1st, 2013 AT 6:38 PM
Tiny
KLAY
  • MEMBER
  • 5 POSTS
Where is the coolant temp sensor?
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Friday, March 1st, 2013 AT 6:46 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Should be by the thermostat it will have a black and yellow wire going to it.
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Friday, March 1st, 2013 AT 6:48 PM
Tiny
KLAY
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  • 5 POSTS
Thanks I will give that a try
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Friday, March 1st, 2013 AT 7:06 PM

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