Guy's, I have a strange missfire on tickover and upto about 2000 - 2500rpm. I Have swapped the coil packs about and this hasn't made a difference. I took the spark plug out to see what that was like and the end was black so I mire brushed it and cleaned it up and put it back it but no difference. The injector is firing fine. When I take the coil pack connector off it doesn't make any difference to the engine running like all the others do.

 

I have heard it may be the PCV valves. I have done a visual inspection of these and the left bank one (where the missfire is) looks ok, but the right hand side one seems to be leaking oil (?!). Would that be making the difference? The PTU seems ok.

 

Please help guy's as I'm at the end of my tether with it.

 

Cheers

 

Ivan

if you take the coil pack connector off, and it doesnt affect the engine running, then there is something wrong with your coil pack or the wiring to it. When you remove it, it should make a noticeable change.

Yeah that's what I thought. I've swapped the coil packs about and it doesn't seem to have made a difference. How do I check the wiring?

Also worth checking the injector connector on the same cylinder.

Yeah had the injector connector off and checked it but seems fine. Injector is actually firing fine so I think it's spark. Does anyone know how to check the wiring?

 

Ivan

Hi Ivan,

 

The easiest way to see if you have a spark(from the coilpack) is tho remove the coilpack, put a spark plug in it and touch the end to earth. You should get a spark bridged across the gap. Just don't get you hands near it or you'll get a nice shock :)

 

Vijay

Visually for starters. Not the actual coilpack, the connector is most likely. Then after that take a coilpack out and put a spark plug in and touch it to earth - making sure not to get a shock!!

It's not Cylinder 1 or 6 by any chance is it ?

Give the left hand connector on the PTU a good wiggle - 90% of the time thats the problem....

Yeah cheers guy's. Andy - you suggested the PTU connector before mate and that cleared it up loads. I think it's something to do with that one connector. Where would be a good earth? Plenum chamber?

 

Ivan

plenum is fine for an earth.