hi there.i am in the middle of rebuilding a 2wd sapphire cosworth i have a problem with the firing side i dont have any spark.i have changed the ignigition amp.new coil new plugs and leads dizzy cap and rotary arm i have power supply going to the coil which i have tested with a electrical tester.i have some supply going to the ignigition amp but i dont have any supply going to dizzy cap.or injectors.and no supply to the fuel pump but fuel pump does work when tested on the battery.so can some please help me.

many thanks.
chris.

 

there should be 2 yellow relays and 2 fuse holders behind the glovebox for the engine/ECU - check these

 

Phase sensor wiring

To check fuel pump turn ignition on and rotate crank pump should come alive once sensor detects a lug on pulley

Paul

If the above is ok

 

all the fuse and the relays are ok.
many thanks.
chris.

 

i will check that and i will get back to you.

many thanks.
chris.

 

hello mate check the yellow relays and only one is working but if you put a wire to the black wire and bridge it to the blueblack on the relays the car sparks and the fuelpump works but when you take the wire of nothing works so can you help with this.


many thanks.
chris.

 

the black wire you are using is the activating supply from the ignition switch to the fuel injection relay m11 at pin 86. the blue/black wire is the supply from the fuel injection relay at pin 87(which also supplies all the injectors) to the fuel pump relay at pin 86.

what is happening is you are using the black wire to directly supply the injectors and the fuel pump relay.
this tells me that the fuel pump relay m10 is working correctly but the fuel injection relay m11 is not.

we know it has an activating supply because of you results by bridging,

so its either the relay itself, no earth for the relay, or no main supply

try the following,
(1) earth pin 85 on the fuel injection relay to any bare metal . if the relay is good the you should all the bits and pieces click in. if it doesnt than either the relay is toast or the earth route could be broken. this relay earths through the ecu at pin 10 so you could check for an earth at that point.
(2) if the relay clicks in and you still have no power to the injectors and fuel pump then check for a voltage at pin 30(red&white wire) on the fuel injection relay m11,,,, if no power there then check fuse 41 for power or blown.

hope that aint to complicated, see how you get on