FlyinFalco

I did a motor swap I'm my 88 t2, and now I'm not getting power to the fuel pump or any firing power to the injectors. I hard wired the fuel pump to make sure that it was working and it is fine. I know that there are the two relays for the fuel system/fuel injectors but is there any way to tell which one of the two is bad? Motor will run on starting fluid but won't continue to run for the simple fact of there is no fuel getting through the injectors. I fuel through the fuel rail but just can't figure out which relay is bad that is causing the injectors not to fire... Please someone help I really really want my fc up and running!

demon721

iTrader: (14)

if i wre you i would do the 12volt rewire so that way you eliminate that pain in the *** stock relay that goes bad. here is the 12v rewire i used for my 88 t2 if you get ur own relay and do the wiring u will be fine. here you go

satch

iTrader: (1)

The relay just under the dash and to the right of the steering column is the Circuit Opening Relay. This relay is Yellow and Black. W/key to start the Blue wire should have voltage on it. This wire powers the pump.

FlyinFalco

Ok we'll that solves fuel pump, but what about not having any electronic pulse out of the harness to the fuel injectors?

satch

iTrader: (1)

How do you know that there is no plulse?

demon721

iTrader: (14)

once yo check the pump and get it that working. turn key to the on positiion to see if the pump is coming on. if not then there is a few other things u can do to make it work.

satch

iTrader: (1)

The pump does not turn on w/the key to on unless the engine is running or the fuel check connector is jumpered or the flap to the AFM is held open.

demon721

iTrader: (14)

ok i had the same issue with my 88 t2 there is a write up that tells u to jumper the wire. thats what i did and im still running it that way i had a wire to make it look nice.. so even if its jumped u still need to open the afm door

satch

iTrader: (1)

If the check connector is jumpered the door does not have to be open as jumpering the connector simulates the door being open.

demon721

iTrader: (14)

thats what i figured hopefully this info helps him out and he can get the car running

FlyinFalco

Getting power to my fuel pump isn't main issue, I have no pulse from my harness to my injectors. Even if I retire my fuel pump I still need to find out why I have no pulse to the injectors... A far as I know the injectors power comes straight from the main relay which gets its power from the ignition switch. So if I'm correct I need to check my main relay and if I have power from the relay then the other side which is the ground side through the ecu.

satch

iTrader: (1)

But you were asked how you know you don't have injector pulse, so for the second time, how did you come to that conclusion? Secondly, the wire which powers the injectors from the Main Relay also powers the coils and since you had the car running earlier on starter fluid then the coils must have been working so unles there is a poor connection at FEM-02, which mates the front harness to the emission harness, the injectors should be powered as well.

FlyinFalco

I know that there wasn't a pulse to the injector, by checking the harness side of the injector plug with a pulse check light. As far as checking fem-02 can ya double verify location for me

satch

iTrader: (1)

Were you checking the primary injectors or the secondary injectors as only the primary injectors works when starting the car so if you happened to check only the secondary injectors then that would explain why you showed no pulse (and at what specific point in the engine bay did you check for this pulse). If you had a spare CAS you could connect it to the harness and w/key to on spin the CAS and the primary injectors would make a clicking sound. And FEM-02 is one of the two large connectors located above and to the right of the ECU.

NoMorePoison

iTrader: (1)

Im having the same issue he is, only my setup isnt in an FC. I know for a fact that the injectors are getting power, as right now both the injectors and coils are hardwired to a 12v source when the ignition is on. I do not however, have the other two relays in the fuel system wired up. Would that stop the injectors from firing?

satch

iTrader: (1)

Which wires do you have hard wired to the fuel injectors?

NoMorePoison

iTrader: (1)

They are black and yellow, its a single wire that then is split into three inside the harness.

satch

iTrader: (1)

And how do you currently have the fuel pump wired?

NoMorePoison

iTrader: (1)

Well its actually all in an HB cosmo, so the fuel pump is currently run off the stock body harness for that car, which has no interaction with the FC's ECU or engine, other than giving it fuel obviously.

satch

iTrader: (1)

Some wires have voltage w/key to start as well as the on position and some just have voltage w/key to on, but not start. You need to make sure you have voltage w/key to start and on to run the fuel pump.

NoMorePoison

iTrader: (1)

The way its setup now is just on a switch, when I flip the switch, they have power whether the car is on or not. Im more wondering if there is some lead into the ECU or something from the fuel pump relay that needs to be there or the injectors wont fire. The coils are working fine, just no fuel.

RotaryEvolution

iTrader: (30)

the main relay was what powered up the injectors and ignition, it also served as the ignition on signal to the ECU to turn it on.

if you are 100% positive the ignition is firing then the ECU is awake and working, the problem probably is an unconnected or faulty ground ring terminal on the main engine harness near the end of the harness. this ring terminal serves as the injector grounds to feed the ECU, without it there is no ground pulse for the injectors to work.

NoMorePoison

iTrader: (1)

So would this be on the end near the ecu, or near the injectors themselves? Im positive the ignition is working.

satch

iTrader: (1)

On top of the engine.

NoMorePoison

iTrader: (1)

Sorry to bring it back up, where on the top of the engine exactly? I didnt really mess with any wiring engine wise, it was all body harness stuff that was altered.