I have a 2002 3dr Renault Clio that has a strange misfire.

It can run normal, altough a bit lumpy, but when left on tick over the engine light comes on and it starts to misfire really badly.

I have put my OBD2 scanner on it and got the following results at different times:

P0314 Single Cylinder Misfire (Cylinder not Specified)

P0300 Random/Multiple cylinder misfire Detected

I have replaced the following parts trying to solve this:

The top wiring loom

all 4 injectors

Throttle body

TDC Sensor

Coil pack, with leads twice one was a brand new one

Plugs twice NGK and now Champion plugs from Renault

After all this the problem still exsist, I went for a 4 mile round drive today, on the 1st 2 miles it was great, altough still a little lumpy, but after it had been stopped, restarted and had ticked over for a minute or two the engine light started flashing and it was misfiring really badly all the way home!!

Any ide's what it could be?

I am thinking a sensor or some thing.

Oh I did fo a compression test both dry and wetand here are my results:

Dry test
Cyl 1 165
Cyl 2 190
Cyl 3 180
Cyl 4 130

Wet test with a tablespoon of 3 in 1 oil
Cyl 1 210
Cyl 2 225
Cyl 3 230
Cyl 4 160

Any idea's guys?

Edited by wattonclio on 03/08/2013 at 16:57