Hi all,i have a 2wd cosworth engine in an old escort and its developed a problem. After half an hour or so driving it,it starts to misfire to the point that i have to pull over as it cuts all 4 cylinders and pops and bangs as soon as i try to rev it. Turn it off and after 10 mins its fine. Ive changed coolant temp sensor and checked gaps on crank and phase. Its on l6 ecu running stg 3. I tested pump voltage today and its at 11.3v. But when i rev it and its missing,it bangs and flames out exhaust. Anyone any idea?

 

Check the earths, then check all of the loom

 

What do i need to be looking for with the loom? I cant see any obvious breaks. I did probably 25 miles in it today before it started. Turned it off,waited 10 mins then drove home where it started again

 

Definitely not enough voltage at the pump.you want close to battery voltage of 13 + volts.
Check your alternator to battery cable as well as your pump wiring for condition.definatley losing power somewhere

 

Definitely not enough voltage at the pump.you want close to battery voltage of 13 + volts.
Check your alternator to battery cable as well as your pump wiring for condition.definatley losing power somewhere

 

Battery is in boot with pump set up so going to wire a feed from battery tomoz using the old pump feed as a trigger on relay. Should be over 13v then.

 

fit a new fuel pump wiring loom

 

Agree with the fuel pump re-wire.

 

I had a fault with my cossie. I could do a steady 50/60 mph but as soon as I go into town traffic my cossie would start misfiring.

I replaced the water temp sensor and it cured my fault.

 

That was my first thought so i changed it. Thought it was cured until it started again on sunday. Guess the new sensor could be faulty. Would charge air sensor affect it like this as not changed this

 

I had the same on my Sapphire, it was the water temp sensor, i read out fault code on it. On L6 With stg1

 

Quick update,changed cts,brown air temp,dizzy cap and rotor,cleaned plugs on loom and rewired pump.so getting 13.5v. Been out today (hot day) upto temp to point of fans coming on and all seems good

 

Yey, they are old cars and need a bit of care

 

Result mate, long may it continue

 

I hope it's sorted matey.