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rpmdiag, Tech and Instructor
Category: GMC
Satisfied Customers: 7892
Experience:  Since 1975
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Plenty power to starter, but will not start. Last night

Customer Question

Plenty power to starter, but will not start. Last night started ok, ran for about 5 seconds, then a muffled pop then engine.died, and would not start back up.
JA: Where exactly do you think the noise is coming from? And how long has this been going on?
Customer: Couldn't tell, it's as if glow plugs aren't firing the engine
JA: What is the model/year of your GMC?
Customer: 2008 GMC
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: The only thing I've tried is getting on line for answers. Don't know where to start, trouble shooting
JA: Anything else you think the mechanic should know?
Customer: No
Submitted: 1 year ago.
Category: GMC
Expert:  rpmdiag replied 1 year ago.

Hi, I’m Ron and I’ll be helping you today.
Before we get started though, Please understand that I don't know
your skill level or tools you have to assist us. Also understand that
I can't see, smell, hear, or touch the vehicle either, so patience is
appreciated. JA is a great Q/A site, but it does NOT replace a
repair shop.
My goal is to make you happy and get a great rating in return for
my time. Sometimes I have to give you bad news that I know you
didn’t want to hear, so please don’t shoot the messenger.

Let's start with checking for spark at the plugs with a spark tester, then check fuel pressure with a gauge. let me know your results. Thanks, Ron

Expert:  rpmdiag replied 1 year ago.

Hi again, just following up on your question. Do you need any more help?

Thanks, Ron