jo88gta

Does anyone know of something that could force all the injectors to stay open? The injectors themselves seem in good shape. Ohms are between 13 to 14 on all eight. I've tested them on the fuel rail and out of the intake and none leaked. It appears that all eight are doing the same thing and everything was fine yesterday morning (until I had installed a new prom with a messed up BIN file) Stock chip has been reinstalled since then.

When I turn the engine over with the spark plugs out, I get lots of gas pouring out of the plug holes. I had 1/2 to a full gallon that had collected in the crankcase. Since then I flushed and refilled with fresh oil.

I felt that the injectors could have been binding and raised the fuel rail to release any possible pressure on them. I crank the car 5 - 10 revolutions get out and fuel pressure is close to zero, gas all over the headers from the plug holes, I disconnect the battery and after a few seconds fuel pressure raises to 15 - 20 and then very, very slowly starts to drop.

Could something be wrong with the ECM or a short in the wiring harness? It seems like the injectors are wide open and spraying constantly while cranking.

305sbc

iTrader: (3)

If the injector driver wire is shorted to ground that would explain it. The injectors get 12v all the time on one wire when the key is forward. The ECM pulses the ground side, so if you short to ground then they stay on.

Don't rule out a short inside the ECM. Have you tried another ECM?

jo88gta

305sbc, thank you so much for the reply. Right before checking your post, I had found one of the injector wires (purple and black) was grounding into the block (from a pinched wire), could that make both banks stay open or just one bank?

Grumpy

All.
While there are two wires that the ecm grounds to fire the injectors, they are tied together in the ecm. So short either to ground and they all stay on.

jo88gta

Grumpy, Thanks!

That save me a lot of searching.