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Username Post: Cylinder Head Ground
Posts: 136

Reg: 07-16-05
02-22-20 01:10 PM - Post#2787060    
    In response to go_hercules

I have hard time believing it's a flakey fuel relay. Doesn't hurt to jump it to rule it out. I think there is actually a pin on the ALDL connector which will jump the fuel pump always on.

I think you're right that the A/F ratio used in open loop is richer the colder the engine/CTS reads. So interesting idea to fake it and then that it ran OK. Does seem to suggest it was too lean initially when it was not running well.

Why it might run OK with CTS plugged back in soon after - not sure. Maybe the pressure delivery from the pump increases a bit after a few minutes - also not sure why that would be so.
Another possibility is it jumped into closed loop on the restart. 180F is right at temp required to go into closed loop. maybe running it a few min while faking it cold it warmed up enough to put it into closed loop on the restart.
65 Belair 350
68 Camaro 327
93 Suburban 5.7L TBI

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