east302
I'm Awesome
So the new MPFI assembly worked...or, at least, it is starting now?
I know the fuel pressure spec with ignition on/engine off is 60-66 psi, so you’re good there. I’ve read that the stock poppets open at 40-psi so would guess it’s the same for the MPFI. If you have 52 at the Schrader valve when running, I’d think that is sufficient.
Try spraying some carburetor cleaner around the injector harness where the o-ring sits. It may have a vacuum leak there. Here’s an article on it:
https://troubleshootmyvehicle.com/gm/4.3L-5.0L-5.7L/rough-idle-after-installing-spider-injector-1
A free check would be to remove and clean the idle air control valve on the throttle body.
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I know the fuel pressure spec with ignition on/engine off is 60-66 psi, so you’re good there. I’ve read that the stock poppets open at 40-psi so would guess it’s the same for the MPFI. If you have 52 at the Schrader valve when running, I’d think that is sufficient.
Try spraying some carburetor cleaner around the injector harness where the o-ring sits. It may have a vacuum leak there. Here’s an article on it:
https://troubleshootmyvehicle.com/gm/4.3L-5.0L-5.7L/rough-idle-after-installing-spider-injector-1
A free check would be to remove and clean the idle air control valve on the throttle body.
Sent from my iPhone using Tapatalk