been too work on a car for a mate of mine , and cant figure why the car when running is not burning the fuel in bore 2 +3 even though there is a good spark on all 4

the lad has changed 4 plugs, new rotar arm , dizzy cap , phase sensor ,crank position sensor , new water temp sensor
strange one for me , compression is fine on all 4 aswell
any help much appreciated

 

u aint got the injectors plugged in the wrong way round have u mate

 

they havent been touched , the lad was just driveing it around and then started too run rough

 

Have you changed the leads? I'd swap them around, put the good leads onto the bad cylinders and vice versa, if that changes things then the leads are duff.
Also if this doesn't work you can check the injectors are getting signal pulse controlled by the ecu, but unlikely to be an issue if some fuel is getting through and 2 of them are definately working, would more than likely effect them all.

 

ok worth a try , deffo getting fuel plugs are pisswet in fuel, but its getting a strong spark on all 4 leads, puzzleing me

 

Sounds as it's overfueling as with most his gone in head first replacing all sensors to no avail, check the MAP sensor hose is in good condition and not cracked and that the phase sensor wires have not corroded and shorted, also check the injectors are pulsing correctly. The most unlikely thing is that the earths for the injectors have shorted but think you would notice this as injectors would run all the time.

Martin

 

Have you checked the co as mine is running 10% at the minute and eating plugs thats what this maybe doing they just dont run.