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sprinkles08, ASE Certified Technician
Category: GMC
Satisfied Customers: 22646
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Have a 2000 gmc w4500 box truck that starts up and runs

Customer Question

Have a 2000 gmc w4500 box truck that starts up and runs sporadically but dies out after about 30 seconds
Submitted: 1 year ago.
Category: GMC
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to JustAnswer!

There are quite a few things that you could have going on. You may have a fuel quality issue, low fuel pressure, an exhaust restriction, or you could be losing spark.

The first step in diagnosing the issue is to see if any fault codes are setting. Have you checked for codes?

Have you checked fuel pressure cycling the key with the engine off, with the engine running, and while cranking after it dies?

Customer: replied 1 year ago.
Ignition code and crank sensor came up originally
Expert:  sprinkles08 replied 1 year ago.

Do you know the P code numbers?