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UrS4 - misfire
Posted: Fri Jun 06, 2014 9:21 pm
by PRY4SNO
Car misfires at idle & under throttle. Improves when warm. Pulled 2312, and replaced the G62 sensor.
Then I soldered a new 2-pin plug onto the engine harness because the old one broke apart when I touched it.
Still misfires.
Where should I look next?
Re: UrS4 - misfire
Posted: Fri Jun 06, 2014 10:20 pm
by EDIGREG
If OE coils, look to the power output stages. You can swap them from a handful of other Audi/VW motors
Re: UrS4 - misfire
Posted: Fri Jun 06, 2014 10:22 pm
by loxxrider
Yep, only time I've had misfire at idle it's been because of coils.
Re: UrS4 - misfire
Posted: Fri Jun 06, 2014 10:29 pm
by PRY4SNO
Good tip guys, thanks. I'll hit up a buddy for spares.
Re: UrS4 - misfire
Posted: Fri Jun 06, 2014 10:41 pm
by loxxrider
That being said, usually I've experienced coils getting worse with heat... Could be vac leak if the car is still on MAF.
Re: UrS4 - misfire
Posted: Fri Jun 06, 2014 11:03 pm
by themagellan
I too have a weird misfire but mine is only at low throttle after hard cornering… I think it may be related to blow by… (thread jack)
Re: UrS4 - misfire
Posted: Sat Jun 07, 2014 2:43 pm
by PRY4SNO
Dave K. on QW recommended to pull the red ECU power fuse to clear the codes... so I'll try that first then look into the POS & coils or injectors. Thanks guys!
themagellan wrote:I too have a weird misfire but mine is only at low throttle after hard cornering… I think it may be related to blow by… (thread jack)
No worries! Nice to keeps solutions to a common issue handy in one tidy location.
Re: UrS4 - misfire
Posted: Sat Jun 07, 2014 6:12 pm
by PRY4SNO
Reset the ECU, ran perfect first time I ran the car. Misfires again as soon as I cranked her over the next time tho.
Will try the injectors and POS tonight when I meet up with a buddy who has a urs6.
Re: UrS4 - misfire
Posted: Wed Jun 11, 2014 9:06 pm
by morris400
I'll try to get my POS off the fire wall tomorrow. If I can you can swap to see if it helps. They did not want to budge last time I tried lol