Hey guys, I got a manual 1.2 htp petrol. Lots of problem free motoring. Today though its just started misfiring, and when it was misfiring the emissions light was flashing.

 

It still starts first time everytime and doesnt stall or have a rough idle, it just missfires under acceleration (very jerky).

 

I might try to read the fault codes tomorrow, but wanted to see if theres any common things to look out for. Could it be spark plugs need changing or something worked loose?

 

This started today on the morning journey and was there on the afternoon journey, so its had 2x long runs and a rest in between, so I feel like this is a new problem that needs sorting, any pointers on what its likely to be?

 

Cheers for any help

 

Edited 2 May, 20242 yr by SkodaFabiaOwner

Update to say petrol tank is 3/4 full and fault codes are:

 

P0303

P0420

 

Also noticed slightly lumpy idle so misfiring at idle also

 

Cheers

Check spark plug condition.

If all OK, refit but swap coilpack that was in cylinder 3 with one of the other two.

See if misfire moves to that cylinder.

If it does, replace that coilpack, if it doesn't,  compression test time.

 

6-valve or 12-valve HTP?

Thanks breezy also just to add wasnt just misfiring, was also kinda limp home on last journey max speed of 20mph with very chuggy acceleration. If I rev out of gear it sounds clean and not misfiring.

 

I have a new set of spark plugs somewhere and its due an oil change so might give it a bit of a service. Cheers for ya help

Don't bother with the oil change until this situation is resolved. It won't/can't help.

Cheers breezy pete just to let you know I did the spark plugs today, already had a set I was planning on doing next service and its all good again, not bad for an 05 motor with 160k+ miles on the clock, been the best car ive ever had, it refuses to die 😂

Edited 11 May, 20242 yr by SkodaFabiaOwner