Question about 1999 Chevrolet Silverado 1500

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Truck fires but wont stay running....... but everything was working great 8 hours ago

Fuel pump is only 4 months old, it primes when the key is turned to the "on" position.... all fuses are good and power connections are all tight

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Check oil pressure switch
after prime 3sec. the run relay for the fuel pump passes through
oil pressure switch on block before run on fuel pump can carry
fuel pres to injector rail

Posted on Feb 29, 2012

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I'd start with one of these and move on to the next.

Fuel
Spark.

Is it getting fuel? You should have an "in tank" electric fuel pump. When you turn the key halfway (just before turning the engine/starter over), you should hear the fuel pump prime. Easy way to check is to look in the throttle body while someone turns the key to the "on" position. You should see/smell the fuel. You can also listen to the gas tank while the key gets turned. You should hear the fuel pump run.

To check spark, pull a spark plug out, put it back on the plug wire and rest the electrode end of the plug up against the engine or exhaust manifold and have someone turn the engine over. You should see the spark plug firing. Don't hold the plug or wire while doing this. You'll get zapped if it's working ok.

If these both check out ok, then take a look at your firing order. If it's off by a significant amount, it may not fire. I've seen this happen when a cap/rotor/wires were changed and the wire/rotor was not positioned on the correct cylinder. (Most of the time they will at least fire or backfire, but either not stay running or run REALLY badly if the firing order is off.

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Starts but wont stay running


In reply: if its not the maf there are 2 relays in the relay box i belive its underhood, 1 primes the fuelline to 32psi the second kicks in after it starts, and keeps it running and varies the psi. if the primer relay isnt kicking in then it wont start due to no fuel

THX

Don :)

Jul 26, 2008 | 1991 Chevrolet Camaro

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