Car broke down yesterday

Mizydoscape

Hey everyone, I'm back again. So the misfire reappeared last week. Changed all the spark plugs. The plug on cylinder 1 was fouled. It's still misfiring when hot.

What's the best next course of action please?

Mizydoscape

To add to this - potential... timing belt?? It's due to be changed. If its worn could that cause a misfire?

AdrianC

Mizydoscape said:

To add to this - potential... timing belt?? It's due to be changed. If its worn could that cause a misfire?

Only if it's so worn it's skipped a tooth, and that'll likely throw up all sorts of errors as well as a lot worse than just a misfire.

How bad was the "fouled" plug? What sort of "fouling"?

Mizydoscape

AdrianC said:

Mizydoscape said:

To add to this - potential... timing belt?? It's due to be changed. If its worn could that cause a misfire?

Only if it's so worn it's skipped a tooth, and that'll likely throw up all sorts of errors as well as a lot worse than just a misfire.

How bad was the "fouled" plug? What sort of "fouling"?

I literally have no idea (the man changed them for me) and said "this is what they should look like" I've got the plugs. This is the damaged one.

Grumpy_chap

Mizydoscape said:

To add to this - potential... timing belt?? It's due to be changed. If its worn could that cause a misfire?

If the timing belt is due to be changed, then it is likely a false economy to skip the change at the correct planned interval.

Mizydoscape

Grumpy_chap said:

Mizydoscape said:

To add to this - potential... timing belt?? It's due to be changed. If its worn could that cause a misfire?

If the timing belt is due to be changed, then it is likely a false economy to skip the change at the correct planned interval.

Yes, I was planning to book this in September. I've always followed the service schedule for everything that is recommended since I've had the car from 18 months old

AdrianC

Mizydoscape said:

AdrianC said:

Mizydoscape said:

To add to this - potential... timing belt?? It's due to be changed. If its worn could that cause a misfire?

Only if it's so worn it's skipped a tooth, and that'll likely throw up all sorts of errors as well as a lot worse than just a misfire.

How bad was the "fouled" plug? What sort of "fouling"?

I literally have no idea (the man changed them for me) and said "this is what they should look like" I've got the plugs. This is the damaged one.

That's not fouled, that's BENT!

Odd that the centre electrode's bent, but the outer one isn't.

Mizydoscape

AdrianC said:

Mizydoscape said:

AdrianC said:

Mizydoscape said:

To add to this - potential... timing belt?? It's due to be changed. If its worn could that cause a misfire?

Only if it's so worn it's skipped a tooth, and that'll likely throw up all sorts of errors as well as a lot worse than just a misfire.

How bad was the "fouled" plug? What sort of "fouling"?

I literally have no idea (the man changed them for me) and said "this is what they should look like" I've got the plugs. This is the damaged one.

That's not fouled, that's BENT!

Odd that the centre electrode's bent, but the outer one isn't.

That's probably what he said. It was a bit stressful at the time!

Any ideas from that? Or is it full diagnostics at a garage jobby?

AdrianC

THAT will certainly cause a misfire!

Unless there's something kicking around loose inside the cylinder, which you'd know about, then the main two options are ham-fisted muppetry when it was installed, or a faulty plug.

I'd just chuck a new plug in and see what happens.

Mizydoscape

AdrianC said:

THAT will certainly cause a misfire!

Unless there's something kicking around loose inside the cylinder, which you'd know about, then the main two options are ham-fisted muppetry when it was installed, or a faulty plug.

I'd just chuck a new plug in and see what happens.

Thanks but all the plugs were replaced (by someone else) after this one was pulled out and it's still misfiring 🤷‍♀️

All this has only started happening after the full service in June. Maybe a coincidence. Maybe not?