Need Help with a Wire/ Ecu Problemo HELP!!!!!!!

[oversteer180]

Ok heres the deal. I just pretty much finished up my ca18det swap into my 1990 240sx. It's all wired up, but for some reason it will crank over and crank over and give plenty of spark through the coil pack and spark plugs, but for osme reason im not getting any fuel at all. My fuel pump is not even coming on. i was told to trace back the wires to the ecu plug and check for signal, so i decided to unravel the protection tape around all of the wires and made an interesting dicovery a think blue with tiny red striped wire was cut down by the ecu plug and not connected to anything. the smae wire that had been wired up top to the black with red wire(you know the wiring with the plugs and stuff lol). Well i don't know what this is, and where it goes, and if this is affecting my fuel pump from turning on. But somehow, someway i need that fuel pump to be rigged, rewired, whatever so my engine can get fuel and start!!!!!

[c-rad]

Ok heres the deal. I just pretty much finished up my ca18det swap into my 1990 240sx. It's all wired up, but for some reason it will crank over and crank over and give plenty of spark through the coil pack and spark plugs, but for osme reason im not getting any fuel at all. My fuel pump is not even coming on. i was told to trace back the wires to the ecu plug and check for signal, so i decided to unravel the protection tape around all of the wires and made an interesting dicovery a think blue with tiny red striped wire was cut down by the ecu plug and not connected to anything. the smae wire that had been wired up top to the black with red wire(you know the wiring with the plugs and stuff lol). Well i don't know what this is, and where it goes, and if this is affecting my fuel pump from turning on. But somehow, someway i need that fuel pump to be rigged, rewired, whatever so my engine can get fuel and start!!!!!

Is it this one here?

If so, mine came the same way and I am trying to figure it out as well. Multimeter is your friend.

[oversteer180]

dude, thats the same ****ing one. It goes to the coil pack connector...which is kinda scary...

[c-rad]

dude, thats the same ****ing one. It goes to the coil pack connector...which is kinda scary...

Yeah, I just did a resistance test with my multimeter and it goes to the coilpack harness AND it goes to the large gray plug at the end of the harness that has to be rewired.

[damesta]

That wire doesn't have anything to do with the fuel pump, check the black/pink wirethat goes from the power plug by the battery to the ecu and check your dropping resistor, provided you have one, if you don't, thats your problem.

BTW, accordingt to the wiring diagrams thtere shouldn't even be a blue/red wire running to the ecu, the one from the coilpack plug should run straight to the ignition coil relay(plug E16).
Modified by damesta at 3:45 PM 3/10/2006

[c-rad]

That wire doesn't have anything to do with the fuel pump, check the black/pink wirethat goes from the power plug by the battery to the ecu and check your dropping resistor, provided you have one, if you don't, thats your problem.

Right, but thats the main ignition wire that is in question here. Without that hooked up, nothing will turn on.

[damesta]

Did you spliced it into the black/red wire when you rewired the plug by the battery?

[c-rad]

Did you spliced it into the black/red wire when you rewired the plug by the battery?

Look at the pic I posted above. The wire is hanging out near the ECU plug. There is continuity between that wire and the pin on the coil pack subharness plug and the large gray plug that gets rewired near the battery. All the wiring is done per the instructions except for that single wire that is just hanging out near the ecu.

[damesta]

As long as your spliced into the black/red wire in the plug by the battery you should be fine, thats were your power source comes from, not from the ecu. Why its ran all the way down by the ecu, I have no idea, but according to the diagrams that wire does not go to the ecu plug. Are you having problems with it sparking or what?

[oversteer180]

hmmm, interestingwhat exactly is the dropping resistor...lol

[damesta]

Its a resistor that controls the injector pulse, this is the best pic I could find, its the little metal box on the upper left of the harness.

[c-rad]

When I got my harness, that thick blue w/red stripe wire was connected to a smaller piece of wire with a butt-splice. So it was hooked up to something at some point. What it was though, I have no friggen idea. I really want to figure this out. I thought I was done with all my wiring (save for the dash plug)