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Finishing up Well, the replacement ECU arrived, the fuel pump now runs for two seconds when you turn on the key and it starts much easier. Thank-you for all your help and for those that are interested, you can buy just about any 85 chevrolet ecu as long as it is the same number. Mine came...

Ecm I put in new oil pressure switch today and it cranks a little but not near as much as before. With new fuel pump relay, now when I jumper 12 volts to wire C the fuel pump does kick on. I will move to ECM and apply 12 volts there to see if wire is good.

Here is what is up Had to haul the wife around today, but I did buy a new oil pressure switch in hopes that it was bad, and I just had to crank the pressure up to get the car to run on the oil pressure switch controlling the fuel pump. I still do not have any action off of the new relay I...

OP switch Ok, I started car with OP switch jumped and test green and white wire C on relay. Test light would not come on and confirmed a good ground by testing light on battery. Pull jumper wire, fuel pressure falls and car dies. There was no 1/4 inch ground strap, it had apparently been...

ground All the wires are supposed to be tied into the block? only the actual negative battery cable was attached at the block. The remaining wires were attached to the inspection plate or to the frame on one of the brake line retaining screws/plates. There is also a ground wire to the cooling...

Ecu So, am I down to needing an ECU or ECM whichever it is? No signal from the computer to the relay, no 12 volts when key is turned on for first 2 seconds - all this starts with the comp? Just asking as that was what I was originally told it needed. Best place to purchase? Good price?

gounds` I spend the afternoon trying to clean up the grounds off the battery, installed a new battery, new ground connectors and underneath car cleaned up ground connection and hooked up ground wires which were disconnected. Just tried to jumper the relay to make it work and it would not kick...

Leak down funny thing - now that I have ran it a little - here it is 12 hours later and it is still registering 25 pounds

Fuel PUmp Fuel pump does not come on with turning key on - fuel pump relay is replaced and there is no signal from the computer at C on the relay to start the fuel pump. AS mentioned earlier the wires from the relay do start the pump if jumped across.

more tests Ok, next phase of testing - no fuel pressure turning on the key, pump not functioning - no pressure grounding out the aldl testing ports a and g pump does not come on - pulled oil pressure switch by distributor and used a test wire to connect the two wires, pump came on...

More info OK, went out today and got code off vette - it has a code 54 - low voltage fuel pump - I also thought I would do the A and G ground to force pump to run and it did not make the pump run. I'll go back through the info you gave me and do more checks tomorrow. Thanks for help so far

85 vette The 30 to 40 pounds when hot was relative to the oil pressure gauge. I have not checked fuel pressure and I was told it had a new fuel pump installed just before I got it - I would hope they replaced or at least cleaned the screen. Previous owner said that there were some wires fried...

Just picked up an 85 vette. When cold, car will not start until oil pressure builds up to 45-55 pounds. It will start firing when pressure reaches 45-55 and finally starts. You cannot hear fuel pump running when you turn the key. Once fired off it usually fires right up but it has started to...

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Checked Ohms I checked ohms on each injector - all read 15. On the driver's side I have 12 volts on one side and 13.5 on the other. On the passenger side I have 13.5 volts on both sides of injector wiring. They will still fire when I jump from the battery to one side of the injector wiring on...

No factory service manual No, I just have a haynes which is about useless for anything technical. Just seems odd I can jump power to number 8 injector and get the others to fire. The same terminal I am applying power to shows -12.5 with key on and -13.9 while running. I did read that if one...

I have an 86 TPI vette only running on the driver's side bank of injectors. I have 12.5 volts at all connections with key on. When I jump a hot wire from battery to number 8 injector I can get the other 3 injectors on that bank to fire and car runs much better but is actually quite smooth just...