GMC Troubleshooting Questions? Ask a Mechanic for Answers
Welcome, I'm Chris (aka Moose). I'm here to help 365 days a year, but not every hour of the day. I try to prevent delays as much as possible. Please understand I am not there and can only advise based on what you tell me. Let's get started.
You mentioned you get 1.2kpsi is that 1200 psi?
Can you do these tests and let me know the results.
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Once it starts are cylinder 5 and 7 weaker than the rest?
For an injector to work the FICM sends them constant power and a pulsing ground signal.
As long as the injector pump and FICM works right and the pressure regulator is working and reading right. An accurate cam and crank sensor reading should be all you need.
I am out of ideas at this point, would you like me to opt out?
opting out now.