Right guy's. Tried a couple of other things on my tickover missfire now.. It only does this on tickover but when it revs above 2000 it goes away. The missfire is centred around the middle spark plug on the passenger side.

 

Here's what i've replaced:-

PTU (cheers Chunk)

Injector connectors

Coil pack connectors

Swapped coil pack

Swapped spark plug

Temp sensor harness

Carried out ECU diagnostic - code 55

Made sure all the terminals in the PTU plugs are connecting.

Used an engine fuel cleaner (Forte)

 

Has anyone got any more suggestions on this before I tear my hair out?

 

Cheers

 

Ivan

could be a bad injector.

measure the resistance across the terminals of every injector by using a multimeter.

They all should be within the 10-14ohm range

 

-Eric

Usually caused by a bad connection on the PTU, left hand connector looking from the front...

Yeah tried that Andy. Just done a compression test and on the problem cylinder it read 55 psi and on two of the others it read 130-135 psi. What does this mean? Whats it supposed to be? Whats the next move?

 

Ivan

there shouldnt be that much difference between your cylinders, and they all sound low:

 

compresion

 

Standard is 186 psi

 

minimum is 142

 

max difference is 14 psi :(

Engine was cold when I did the test. Would this make the difference. Where do I go from here?

 

Ivan

Sounds like possibly a valve problem to me :( Cylinder leakage test next to determine the source of the leak...

Engine was cold when I did the test. Would this make the difference. Where do I go from here?

 

Ivan

 

compression tests should be done on a hot engine, but you wouldnt get 1 down that far when cold :(

 

as andy says - cyl leakage test next