Mis-firing half way through a journey

[Blane1992]

Half way through my journey my car started mis-firing and was just not going anywhere when I put my foot down, sounds very weird at idle as well. Could this just be my coilpack and plugs or something totally different?

cheers Blane

 

[Jakey92]

I still think it sounds like what happened to mine Blane. It was one of the pencil ignition coils

 

[Blane1992]

Gonna have to try that then, is that the long plastic things that you unscrew which sit on top of the plugs?

 

[Matt Cup]

Yep, I'd get some as spares too as you will be changing them regularly going from experience.

 

[Pulsator]

Anyone got a link to where you can purchase these as i think i could do with cahnging a few,

Or is it easier just to change the coil pack and have a spare ??

 

[Matt Cup]

172's dont have pencil coils, so unless you've got a 1.4/1.6 it doesn't apply to you mate.

 

[MDP91]

Sounds exactly like what mine is doing to.

 

[Beef-Mc]

Yep sounds like a pencil coil is faulty, if you take each one out individually, the one that doesn't make the car run worse is the knackered one.

 

[Pulsator]

Thought so - would be new coil pack in my case wouldnt it LOL

 

[Blane1992]

So take one out, start the car up and keep doing it till I've done all 4?

 

[Matt Cup]

I was shown by the RAC guy to unplug the injectors 1 by 1 underneath the metal block and when the engine stops running rough then that's the coil to change.

 

[Jakey92]

I was shown by the RAC guy to unplug the injectors 1 by 1 underneath the metal block and when the engine stops running rough then that's the coil to change.

^^ Try this. I tried the method below but found the engine ran the same everytime I took a coil out

Yep sounds like a pencil coil is faulty, if you take each one out individually, the one that doesn't make the car run worse is the knackered one.

 

[Matt Cup]

I also found that it's usually Cyl 2 or 3 that fails first out of the 4.

 

[Blane1992]

changed the plugs last night but carried on misfiring.. the plugs were due a change anyway. Got a new pencil coil this aft and found it wasnt firing on cylinder 3 due to a faulty pencil coil. Went for a quick drive with the new pencil coil and everything seems to be fine now.

 

[Matt Cup]

Did you only buy one? If so get a spare. I had two fail on me within 2 weeks.

 

[Blane1992]

yeah just got one.. yeah i'll get another then just incase. my luck another will go