trentt

Sapphire cosworth no spark... help...
I'm rebuilding my 4x4 , I have spark from the coil when the ignition initially turns on then nothing... any ideas please.
I've a new dizzy cap, rotor arm, new crank sensor, was working when the engine was removed..

Thanks in advance.

Caddyshack

Check the gap on the bottom crank sensor. It is easy to knock them and the gap gets too big.

trentt

Great, thanks for that, I'll try that next....

Caddyshack

had it on mine, wasn’t actually out by much but it wouldn’t run.

pectelboy

Check the phase sensor in the dizzy . They are renown for corrodeing , had this a few years ago

james kiely

iTrader: (5)

have you got a god earths to the engine and body?

trentt

Yeah, good earths, just been told probably got to much paint on the bottom pulley,..

trentt

Still no joy, ive changed the coil, phase sensor, cleaned the pulley, moved the crank sensor as close as possible, still only sparks when ignition 1st switchs on then nothing from the coil whilst turning it over.. baffled....

cossie2

Have you tried to swap ignition ampifier?

trentt

no, ill have to source one, thanks.

james kiely

iTrader: (5)

ave you tried your ignition module up on the inner wing .this supplys your power and earth to your coil

have a look at the wiring for the l8 on this site

http://bigturbo.co.uk/

trentt

Yeah, tested all the wiring, earth is good and there is a feed going into the module, will order a new one, then thats tge whole ignition system replaced, i have noticed that the fuel pump dont cut out also....???

Monte 140

check that the phase sensor plug and the knock sensor plug are on the right ones, on the bracket under the distributor, they fit both .
also check the 2 pin connector for phase sensor inside the distributor, this can also be mounted both ways around.

trentt

Tried all of those. Thanks.. 👍👍

james kiely

iTrader: (5)

have you changed the fuel pump wiring

trentt

No, but i have looked into replacing the pump wiring, is it worth doing?

james kiely

iTrader: (5)

a million percent .get a wiring kit for it .

is the relay faulty .has someone bridged it out i wonder.the ecu should cut the pump out after priming unless its running of cours lol

trentt

Another job to do then, cheers for that. 🤔😁

james kiely

iTrader: (5)

it will save you melting your engine mate .bad power supply equals a weak pump followed by a expensive visit to your engine builder witha melted piston lol

its also worth changing your main wire from the alternator to the battery ,and battery to the starters aswell.they usually at this point have corrosion and are less efficent

James at auto dynamix does all the kits you need

trentt

Think he is the guy i had the fan loom off...
Thanks for the info. 👍

cossie2

Phase sensor gap is less than 0.3mm and in correct timed position?

trentt

Yes.. all good, its going to be something daft i know it is, process of elimination tho...😫😫

cossie2

...Plugs were wet when you removed them from the engine after turning over?If not check if you have 12v on pin 20 of the ecu..btw you are sure that you havent mixed two connectors for the cps and phase sensor?

trentt

ive not checked, will do when im home after our holiday,
i swapped the cps and phase sensor over when i couldnt get the pump to cut in, which worked so they must be right.