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Thanks delcowizzzard next question what does B10 do is it a park natural safety switch or dose it help stop the engine stalling and what is B12 0-25v A/D. The fuel relay in the original Chev and is marked F E D C A. F is A1fuel pump relay drive E is power supply through t he oil pressure switch D is D1 ground A is battery fuse 1 C go,s to aldl just wondering if I should replace it with normal one.

Charlie

park neutral wire is good if auto makes the ecu add idle steps when you shift into gear to stop stalling and activates tcc function if manual just leave dissconnected

Thanks for that I need to add that one as I have a turbo 350 but no converter clutch is it a earthling wire or does it need to be earthed.
Charlie

It completes a ground when in Park or neutral. In mine it adds 100 RPM and in yours it adds 50 RPM.

Thanks Charlie

Not getting any response from the nv ram The fuel pump doesn't run at key on and engine won't start Tunerpro can't find hardware and doesn't connect so don't know if I have wiped the nv ram. How can I test or check for problems
Charlie

Fuelpump should always prime even if the nvram was corrupt I'm pretty sure.do you have the two constant powers to the ecu and the switched ignition source as well

Yep been through the pin out several times and have the three power supplys the Chevy Aldl has a wire to the fuel relay and if you supply power to it the pump runs I trying to find a pin out for the obd to be sure that I have the connection right to the interface and pc

The fuel pump doesnt prime when the ecm isnt running. If power and aldl wiring is good then do check the nvram contents. Might need to put a fresh base tune on it. Best to keep the RW jumper off to protect it untill your up and running ready to tune.

The fuel pump should run for a few seconds after the key is turned on shouldn't
Charlie