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rpmdiag, Tech and Instructor
Category: GMC
Satisfied Customers: 8069
Experience:  Since 1975
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Trying to start but just will not turnover. I didn't notice

Customer Question

Trying to start but just will not turnover.
JA: Have you checked the battery, particularly the terminal connections? Are they corroded?
Customer: I didn't notice any corrosion unless its between the connection. Could it be moisture build up somewhere?
JA: What is the model/year of your GMC?
Customer: 2002 Sierra GMC 1500. Mileage is 232,592. It was working fine Saturday when I drove it. My oil change is due,
JA: Are you fixing your Sierra yourself? What have you tried so far?
Customer: Not going to repair unless its something that I no I can repair. Electrical work, not prepared for that. Maybe checking some parts associated with the starting of the vehicle.
JA: Anything else you want the mechanic to know before I connect you?
Customer: One key issue is that its trying to turnover. My gas meter indicates that its less than a quarter full of gasoline. Its very humid and the temperature has fluctuated from freezing to the 50's.
Submitted: 8 months ago.
Category: GMC
Expert:  rpmdiag replied 8 months ago.

Hi, I'm Ron and I will be helping you today.
Stand by for a moment while I prepare your answer.

Expert:  rpmdiag replied 8 months ago.

Just to be clear, if the engine is NOT cranking, then the battery needs to be charged and tested for specific gravity and load. Check cables at both ends for corrosion. Test starter draw.

If the engine DOES crank but just doesn't start,

The problem can be a loss of spark or fuel. You can check for
spark at the plugs with a spark tester. Check compression too for a
possible valve timing issue with a compression gauge.
You can check fuel pressure with a gauge and all of these tools
should be available to you at your
local parts store for rent or purchase.
You need to check for any stored codes in the computer with a
code reader or a scan tool.
The code reader only gives the codes and definitions, where the
scan tool gives you all
the needed data to diagnose the codes.
Thanks, Ron

Expert:  rpmdiag replied 8 months ago.

If you are satisfied with my answer, I would greatly appreciate a 5
star rating now and I will still assist you after you have rated me
too if another question pops up. I don’t get credit for helping you
until you rate me.
Thanks again, Ron