mk4 1.8t agu missfire

[lukeyyyyyyy21]

Recently found a missfire. Happens around 3k rpm, any speed happens around twice every time i drive it now.

Have plugged it into vas, found no fault codes under engine electronics and fueling. As suspected could be coils... Changed spark plugs to bosch double standard ones.. I've had this missfire since I've put fuel system cleaner in and only run on super unleaded.

Related mods are air filter, and turbo back exhaust. Mileage 104k oil changes every 3k...

Old spark plugs were white so it must be under fueling....

Anyone know what this missfire is because it doesn't just happen under load..and what else to check?

[gtibarnesy]

I think there could be a couple fixes for this.  Is the fuel filter new? Could be worth changing to count it out.  Is there a electrical connector on the side of the airbox(not air mass), possible 4 or 5 pin maybe? I have known these to fail and causing running issues

[Wayne]

Could be a coil pack playing up

[richw911]

Ignition amp 

[lukeyyyyyyy21]

I think there could be a couple fixes for this.  Is the fuel filter new? Could be worth changing to count it out.  Is there a electrical connector on the side of the airbox(not air mass), possible 4 or 5 pin maybe? I have known these to fail and causing running issues

I changed the fuel filter 8k a go... No electrical connector either...

[lukeyyyyyyy21]

Could be a coil pack playing up

if it was the coils wouldn't it come up on the diagnostics with clyinder (?) missfire?

[RTechUK]

Could be a coil pack playing up

if it was the coils wouldn't it come up on the diagnostics with clyinder (?) missfire?

The AGU ecus dont reconise missfire detection, You need to do a logging session to test the air fuel ratio this should give you a picture of whats up with you engine.   If it was AUM then it would be eaiser to diagnose as its got wideband lambda an missdet.