Hi, can any one help me, ive recently put an engine in my saphire cosworth, and its only running on 2 cylinders (3+4). Ive checked for a spark on the 2 cylinders not firing, and they have a good spark, the injectors have their 12v feed, and seem to be working. ive gone round and unplugged 1 sensor at a time and they all make a difference to the running of the engine (its makes it cut out). Ive fitted new plugs (genuine ford), replaced the dizzy cap and rotor arm, plug leads are motorsport ones. Can any one make any segestions to what i can check next???

Cheers steve

 

phase semsor and its gap.
crank sensor and its gap and that all 4 lugs are intact.
might be worth doing a quick wee compression check too.

 

The fact they spark it quite good, so perhaps it's the injectors? The injectors are permanent live and switch earth via the ECU, the only real way to test this is with a NOID light, is the fuel getting to the two injectors?

Also as said check the crank pulley as the lugs can break off.

Martin

 

Take the plugs out of the cylinders that are not firing after you've just idled it, if the plugs are wet they're getting fuel too

 

Hi, ive done a compression test, all 4 cylinders on
are on 11bar. Ive just bored some noid lights this morning so ill be carry out that test at lunch.
cheers for all the replys