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rpmdiag, Tech and Instructor
Category: GMC
Satisfied Customers: 7752
Experience:  Since 1975
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Starts for 5 seconds then shuts off. Could it be the Cam

Customer Question

Starts for 5 seconds then shuts off. Could it be the Cam shaft sensor ?
JA: Which particular sensor are you asking about? And have any trouble codes been triggered?
Customer: Yes the cose says it is the Camshaft sensor
JA: What is the model/year of your GMC?
Customer: Suburban 1500,
JA: What year is your Suburban 1500?
Customer: 1996
JA: Are you fixing your Suburban 1500 yourself? What have you tried so far?
Customer: fixing myself. did tune up, replaced fuel filter. When cold it stars momentarily then shuts off. Hard to keep running. When it warms up it is fine all day
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 9 months ago.
Category: GMC
Expert:  rpmdiag replied 9 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 9 months ago.

The problem can be a loss of spark or fuel. You can check for
spark at the plugs with a spark tester.
You can check fuel pressure with a gauge and both 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

Customer: replied 9 months ago.
Did the suggested. Where is the Cam Shaft Sensor located on my Vehicle? I know where the Crank
Sensor is ?
Expert:  rpmdiag replied 9 months ago.

It's not a cam sensor issue. What is the pressure reading you got on your gauge?


Expert:  rpmdiag replied 9 months ago.

Our goal here is to assist you in the repair of your vehicle by
supplying you with well educated information. We may not always
have the exact fix you wanted to hear, but our job is to get you on
the right track, which we always do. We can’t hear, see, smell or
touch your vehicle from where we’re at, so your understanding of
that is greatly appreciated. There are no magical or miraculous
answers, but we do our best to guide you in the right direction.

Thanks again and please remember to rate me 5 stars and keep this link in case you need me again later on.


Expert:  rpmdiag replied 9 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

Customer: replied 8 months ago.
The pressure is 58-60 lbs. Then drops to 4 lbs.shuts truck off. Then to 58 while running
Expert:  rpmdiag replied 8 months ago.

Not good, it needs to be consistent. Pump is bad.

Thanks again and please remember to rate me now.