hi all,
new to this site and cosworths so please bare with me.
i have a mk1 escort and just been given a 2wd cosworth engine.
i have the engine bay harness and ecu. the harness has 2 relays both yellow.
1 black connector and i yellow. i think the black is for the fuel pump.
there is also a purple connector with no relay, is this used.

ok. my problem is i have a self contained fuel system in the car, seperate relays and fused.

can i do away with the relay on the loom or do i need to use it because of the ecu. if so HOW.

any info would be great.

thanks

 

You can find wiring diagrams here: http://bigturbo.co.uk/main6.htm
I think you can replace the fuel pump relay for your own. Don't forget the amal valve and the Idle speed valve!
I would keep the main relay as it feeds the ecu, ignition coil and the injectors.

 

any one got any more advice.
what is the purple connector for

 

Same thing with my car, 2WD Saff Cossie. Purple connector is connected to nothing and it all still works fine. I'm not an expert but possibly it's for aircon or some other addition that isn't in the car.....who knows? I'd like to know too though!

 

I would leave the relays alone and use the saph fuel relay 12v+ (pin 87) to trigger your new fuel relay/s.
Once the ECU is activated its pin 28 that activates earth switch to the fuel relay (pin 85 ) which in turn provides the 12v+ at the pump ,iscv and boost solenoid.

 

thanks for the replys.
so i take it from pin 87.
to my relays pin 85.
is that right

 

isn't the purple relay for the fuel cut off in the event of an accident

 

It depends how you have wired your new relays in. If pin 85 on your new relay is the 12v+ 'trigger' on the coil side then yes the above will be correct.

 

okay i have wired my pump relays like this.

http://img.photobucket.com/albums/v2...4f/o44pump.png


using the old blk/r thick wire for the fuel pump as the trigger.

when i power up the signal from that wire comes back earth.

any suggestions please.

 

No, Saphs did have cut off switches for this reason though!

That is correct, do you actually have the ECU etc powered up yet? If not it needs to be...

Martin

 

yes i have main 12v feed from battery.
12v switched.
earthed through the harness.

head scratching time

 

this is how i have wired the engine loom


http://media.turbosport.co.uk/2006/7...9129027100.gif


with this for the fuel pumps..

http://img.photobucket.com/albums/v2...4f/o44pump.png


all relays ok.. all fuses ok.

 

But you say your not getting a supply from the trigger, therefore, ground it.

If you have power, then it is not being switched via the ECU.

Martin

 

hi martin
the ecu is grounded

 

I am referring to the relay...

The relay is grounded via the ECU, but if is this is not happening it would explain why you have no power from it.

Therefore, if you ground the relay this should close it.

Martin

 

hi martin
i will try that tommorow.
will keep you posted.
thanks

 

Make sure you have a good earth for the pump itself .

If you only want your new relay/fuel system setup connect pin 28 wire to the trigger side on new relay. That can be 86 or 85 and earth the other side .
If your battery is in the boot earth the pump direct .

 

hi martin.
i made new relay harnesses as they were a bit rusty. grounded the relay as suggested.
still showing earth from fuel pump wirel.
any more ideas.
electrics not my best point.

 

PM replied to.

Martin

 

all relays fine.
power going to ecu all okay.
the one thing i dont have on is the amal valve. i am using manual boost control.
would this affect the ecu.

 

did yoy manage to sort it out?

 

no still struggling.
all relays fine.
power going to ecu all okay.
the one thing i dont have on is the amal valve. i am using manual boost control.
would this affect the ecu.

 

so all your relays and fuses are fine and have power at the ECU.
Check the wiring associated at the hairbrush and give them a clean up.
ECU turns the pump on as said^ via pin 28.

Is the pump earthed well and is it new/old??

Not sure about the amal valve but im sure ive unplugged mine before and started the car so no effect there imo.

 

all brand new wires for the pumps.
will clean hairbrush connector.
after that god knows.

 

one of the pins is bent and not connecting in the chip, within the ecu.
i take it this may be the problem.
and nowhere on kos to fix ecu's.

 

So you have power @ the OE relay? If it does not close, you have a faulty relay? (assuming you have it wired correctly)

The ECU is irrelevant as this is not controlling the relay (as you grounded it).

Martin

 

edited.

 

IT LIVES again.
after all your input and advise. a lot of checking rechecking and checking again, i found the problem.
2 faulty brand new relays.
so 2 more sent from athens, another 55 euros, so 110 euros in totall.
i also installed a new chip. pins looked nasty.
hey presto, the beast lives.
thanks for all our advice guys.
will post a video asap.

 

As I said above then

Glad it's running.

Martin