cylinder not firing, reasons?

forgotmyname

thescouselander wrote: »

The wife's car had the same problem which I sorted myself but as it happened the ECU incorrectly reported which cylinder was misfiring. Could be that the wrong coil pack has been replaced.

Its those stupid Renault people who number the engine from the gearbox end not the crank pulley side.

Strider590

forgotmyname wrote: »

Its those stupid Renault people who number the engine from the gearbox end not the crank pulley side.

Or when the ECU numbers them in firing order, not physical position.

System

If it is a MK6 Fiesta it is the ECU that has failed and its a common fault but the cause is what others have mentioned. The ECU ends up having to drive the coil pack harder so the power transistors in it pack up.

thescouselander

forgotmyname wrote: »

Its those stupid Renault people who number the engine from the gearbox end not the crank pulley side.

Indeed, it was a Renault and I was aware of their backwards cylinder numbering system - I still couldn't match up the error code to the right cylinder. Got it by trial and error in the end.

firely2327

Thanks folks. Got it into the garage today and it was a HT lead that was the main problem, and one of the spark plugs had water around/on it too apparently. New set of sparks and ht leads, together with filters and oil change will now keep me going a bit longer. The car is a 2005 and has relatively low mileage, about 52k.


There were two advisory notices during the service that I need to look into futher: 1) slight leak on power steering pump and 2)leak/sweating on water pump. I gather these could set me back a few hundred quid...... Can't complain too much I guess