• Guest would you be interested in CUPRA or SEAT valve caps? let us know in the poll

  • Welcome to our new sponsor Lecatona, a brand dedicated to enhancing performance for VAG group sports cars, including SEAT, Audi, Volkswagen and Škoda. Specializing in High Pressure Fuel Pump (HPFP) upgrades.

Help - big stutter under power and now misfiring - Coils or something worse?

atconc

Active Member
Jul 1, 2013
48
0
I was driving today and under hard acceleration got a sudden stutter and then very rough running with flashing orange EML. No smoke, no loss of fluids. Car has just had an oil change and MOT last week (it's a BAM 225 LCR with revo stage one remap, no physical mods). The AA guy said the oil is slightly over filled but not enough that he thought would cause an issue, especially as there's no smoke.

I pulled in and checked the fault codes with torque app on my phone and got nothing, so tried driving again and got flashing EML and torque showing Misfire on cyl 3 - so stopped again and called the AA thinking coil packs. I have noticed a slight stutter under hard boost in high gears a few times recently, but not frequent enough that I've got round to investigating.

AA guy came, swapped the coil on cyl 3 with the 1 spare he had in the van, ran the car again and it seemed rough still, scanned with his scanner and got codes for random misfire and misfires on cyl 1 and cyl 3.

So he did a bit of experimenting swapping the coils around (he put my coils back in and then swapped 3 and 4 over) and it seemed to be running a bit smoother so he followed me the couple of miles home before running another scan the EML flashed intermittantly on the drive when accelerating (very gently) but cleared again each time (was off when we stopped).

Once at home scanned again and he got Misfire on cyls 3 and 4, so he thinks 2 coils failed simultaneously, does this sound plausible or is there something else I should be checking / worrying about?

I have since scanned with vagcom and got the below, so nothing extra from what he picked up with the code reader in his van.

Address 01: Engine Labels: 06A-906-032-BAM.lbl
Part No: 1ML 906 032 A
Component: 1.8l R4/5VT 0001
Coding: 10510
Shop #: WSC 02629
VCID: 3F8DA57E3DDDB1E6AD9-517A
VSSZZZ1MZ5R054707 SEZ7Z0E2862699

3 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 -
16688 - Cylinder 4
P0304 - 35-00 - Misfire Detected
16687 - Cylinder 3
P0303 - 35-00 - Misfire Detected
Readiness: 0010 0101

As he couldn't get parts on a sunday he said to call them out again tomorrow and they can either try to get 4 coils and replace at the roadside or recover to a garage of my choice.

I watched him change the coils to see if I thought I could do them myself but don't feel confident about getting the boost related stuff (Vacuum reservoir etc) back together correctly. So even if it's just coils it will need to be done either by the AA or the garage.

Does this sound like the classic coil pack failure or should i be worried?
 

ibizacupra

Jack-RIP my little Friend
Jul 25, 2001
31,333
19
glos.uk
coils from GSF... change all 4.. if all of same age once tired they are all tired..
also plugs.. excessive gaps will contribute to spark blow out.. when were they last changed? check and replace also as required.
 

atconc

Active Member
Jul 1, 2013
48
0
Thanks Bill

Plugs were changed 6 mths ago in sept so I think should be OK?

It's misfiring all the time even at idle now does it sound like failed coils?

Sent from my GT-I9505 using Tapatalk 2
 

atconc

Active Member
Jul 1, 2013
48
0
Just to update, AA came back and changed all 4 coils at the roadside today and car is running smoothly again :)

Sent from my GT-I9505 using Tapatalk 2
 
Genuine SEAT Parts and Accessories.