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1999 chevy K2500 surburban 7.4L. Umit starts and then

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1999 chevy K2500 surburban...

1999 chevy K2500 surburban 7.4L. Umit starts and then immediately shuts off. the "security" light is blinking. I have changed fuel pump. fuel filter, fuel relay. I have 55psi at fuel rail. I am getting spark. any thoughts?

Mechanic's Assistant: Does the light flash, blink or stay solid? Have you tried to reset the security system?

It is on steady until you start then it will flash. Have no idea how to reset the security system

Mechanic's Assistant: What is the model of your '99 Chevy?

K2500 suburban

Mechanic's Assistant: Are you fixing your Suburban yourself? What have you tried so far?

I have tried. replaced fuel pump, fuel filter, fuel relay. i have 55psi at the fuel rail. i do have spark.

Submitted: 10 months ago.Category: Chevy
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Answered in 1 minute by:
9/28/2017
Chevy Mechanic: Jerry Newton, Chevy Technician replied 10 months ago
Jerry Newton
Jerry Newton, Chevy Technician
Category: Chevy
Satisfied Customers: 5,694
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
Verified

This is a problem with the security system. It will allow the engine to run for 2 seconds before shutting it down, that's what you're experiencing. The security light is your clue on this, it shouldn't be on if everything was OK.

Proper diagnosis would require a good scan tool, but what you can try in lieu of that is a relearn procedure. Are you familiar with how to do this?

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