The Simps

My vey rare intermittent misfire has now become more intermittent! I'm suspecting a broken down coil pack but wondered if these engines tend to suffer anything in particular?

Thanks.

Paveldn

If you had an oil change and it was overfilled it can cause misfires, please see attached.
I do not know of any thing else, but a VCDS scan might give you a more precise diagnosis.

MP4.2+6.0

Yet another reason to buy the VAG-COM/Ross-Tech cable. A scan will tell you immediately which cylinder and if spark is acting up.

mishar

+1

The Simps

Thanks for the reply, finally got the thing home!

Yes it had its 120k service last week. Checked oil level just now but all fine.

When I have previously checked the location of the intermittent misfire it had always been cyl 5 & 6 which I believe are the 2 next to the oil fill?

I think I will try a couple of coil packs as they're not much money and see if it goes away.

Yes I know I need vagcom. I keep wanting to buy it but something new crops up on the darn thing to pay out for! Last week it was new compressor, 120k service, brake fluid, rear discs & pads.


From the quick glance I had tonight it looks like the coilpacks just unplug the pull out? Not screwed/bolted in?

Cheers.

Crisis3

I recently had a misfire in cylinder 4, put in new coil, still misfire. Swapped plugs, still misfire. Changed fuel injector, problem solved. I hope this isn't your case, but I started with the easier (and cheaper) repairs, but ended up at the deep end of the pool.

The Simps

I'm pretty confident its not the injector as it still missfires when running on the LPG system so that rules it out.

I had the codes read today and its cyl 5 & 6 again which it was previously. I figure that if it was a sensor somewhere it would be random cylinders. So seeing as coilpacks are cheap enough I've ordered 2 in for tomorrow. Fingers crossed!!

The Simps

Replaced coil packs on 5 & 6 tonight but misfire is still there but only seems to be under load around 1500rpm then clears. I need to do more driving tho really to text thoroughly.

Any thoughts?

mishar

It looks like injectors. Pour some injector cleaner in your tank. Do that next few refueling. Don't use cheap fuel.

The Simps

Worth a try a guess!