Another Missfire question.

[gogsie]

I know its been asked before but i'll ask again just to be sure.

Was out for a wee spin at dinner time and noticed that the car was struggling above 4k rpm, didn't think much about it until on my return to work it developed a major missfire and almost died and wouldn't take any throttle. I stopped and it idled fine but was popping when i gave it throttle.
Limped home and it seemed to clear abit.

It has a wee exhaust leak that i think maybe the Mani/Cat joint.

Just looking for some direction on where to start really.

Its a PH1 172 on an X plate only has 1 lambda.

 

[DannyR]

Coil pack I would imagine, Mine popped and banged more once I had a hole on my exhaust welded up!

 

[henryp]

i had a similar problem. turned out to be a faulty ht lead. mine would misfire like mad popping and banging. and was really hard to get it to move once stationary

 

[stoddie]

yeah along the lines of whats already been said,

could also be a rust plug top or anything like that. a place to start would be to pull the leads and spray wd40 in each plug cap - this removes moisture. do the same on the coil plug caps.

try that and see how it goes - if not its a process of illimination between coil pack and leads.

 

[gogsie]

Thanks guys for the replies, Went and got some new plugs as on the way home it was on 3 cylinders!. Its now running better and no missfire but i'll be changing everything else mentioned soon as shes done 116k and i want it to reliable.

The plugs had seen better days the gaps were huge!.

I couldn't get Platinums so i got some 4 pronged Bosch jobs as a temp measure for now, should be ok?

 

[DannyR]

What should the plug gap be?