VAG 1.8tsi misfire

[Bill]

In a Skoda Yeti. Few error codes, main one says misfire on cylinder 4.

Is there a likely suspect or any way to narrow this down? (I'd take a wild guess at a coil pack but that is all it would be.)

Edit:

[Bill]

I could move a coil pack and see if the error moves??

[Jazoli]

Yes you could try that, its a common issue and VAG coil packs are almost consumables, I used to carry a spare in the boot.

[Bill]

Thanks. Is there a recognised brand that's any good? Looks like two are Bosch and two have no markings.

[Jazoli]

I always bought Bosch ones from ECP they were about 40 quid each.

[stevemcs]

Swap 4 and 3 coil packs over and 4 and 2 plugs over clear codes and drive - at least 10 miles.

[PT1984]

Opie Oils used to sell x4 NGK coils for £100. Grab the plugs too. My S3 ran noticeably better after. And I will throw in the obligatory - check the sump pickup!

[Bill]

PT1984 said:

check the sump pickup!

I will Google, ta!

[cuprabob]

PT1984 said:

check the sump pickup!

Is that not just the old 1.8 20V engine or do the new 1.8 TSI engines suffer this too?

[Bill]

stevemcs said:

Swap 4 and 3 coil packs over and 4 and 2 plugs over clear codes and drive - at least 10 miles.

Misread that for a moment and confused myself! Good plan, thanks.

[PT1984]

It’s not related to the misfire. It’s just these engines love to sludge up. The dipstick guide also likes to dissolve and it ends in the sump. I have had both the 1.8T and the 2.0TFSI and they both did it.

[cuprabob]

PT1984 said:

It’s not related to the misfire. It’s just these engines love to sludge up. The dipstick guide also likes to dissolve and it ends in the sump. I have had both the 1.8T and the 2.0TFSI and they both did it.

Thanks, good to know.

[Bill]

Got my local friendly garage to order some for yesterday as I wasn't sure if DPD would insist on someone signing for them from EPC today. All sorted and I replaced the other non Bosch one as well. Looking at the numbers on them I suspect the two I swapped are originals from 2011!