MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: bower on April 26, 2014, 02:34:09 pm

Title: misfire count
Post by: bower on April 26, 2014, 02:34:09 pm
hi ive just checked my misfire count on vcds and i recorded a 4 misfires under load on cylinder one and i wondered if this it anything to worry about?
Title: Re: misfire count
Post by: bacillus on April 26, 2014, 02:49:38 pm
Could be an indication of needing new plugs or coilpack within the troubleshooting list..
Title: Re: misfire count
Post by: bower on April 26, 2014, 03:00:53 pm
ive just recently changed the plugs.
so its not an acceptable misfire then?
Title: Re: misfire count
Post by: Dan_FR on April 26, 2014, 09:01:43 pm
Misfires are not acceptable, period.

Mine started on one cylinder a few months back, was a dying coilpack. Swap coilpacks with another cylinder and see if it follows the coilpack
Title: Re: misfire count
Post by: mvb12 on April 26, 2014, 09:37:45 pm
I would just change all the coil packs.

heard the red tops give you added bhp  :laugh:
Title: Re: misfire count
Post by: betty_swollox on April 27, 2014, 12:27:07 am
Yeah misfires are normal mate, definitely something that's 'acceptable'

Fuuuuuuck me lol
Title: Re: misfire count
Post by: DanGB on April 27, 2014, 12:41:31 am
Misfires actually happen on standard cars out of the factory. But a count of 4 is a bit too high on one cyl.
Title: Re: misfire count
Post by: robdf2 on April 27, 2014, 09:49:29 am
hi ive just checked my misfire count on vcds and i recorded a 4 misfires under load on cylinder one and i wondered if this it anything to worry about?
It depends on whether your car was warm or the count was done straight from a cold startup?

Believe it or not I had over 25 counts and seat said it was normal !
Title: Re: misfire count
Post by: bower on July 13, 2014, 05:01:48 pm
resurrecting my post because the problems still there and i dont know where to go from here.

when start up from cold, i get shaking going through the car in high gears (4-6) at 2k revs, if i put the foot down it doesnt do it but cruising it does.
ive changed the coil packs, fuel filter and spark plugs but the problems still the same if not worse. ive done a vcds scan today but no errors and i also did a live data collect and it was misfiring on cylinder one, upto 6 misfires.

the strange thing is when it gets up to temp it stops shaking?

where to go from here? is it an injector? anything i can check on vcds?
thanks for any help
Title: Re: misfire count
Post by: martin@gti.co.uk on July 13, 2014, 05:25:33 pm
might be the injector or carbon build up on intake valves.. try different injector first..have a look on the gap on spark plug again and check wiring sockets for corrosion etc.. Hope you get it sorted mate.
also if you can do logging
use APR page for this:
Misfire-Specific Diagnosis
Item #   Vag-Com
Block #   Description
1   001-1   Engine Speed
2   003-2   Intake Air Mass
3   015-1   Misfire Cyl 1
4   015-2   Misfire Cyl 2
5   015-3   Misfire Cyl 3
6   016-1   Misfire Cyl 4
7   054-3   Accelerator Pedal Position
8   054-4   Throttle Plate Angle
9   101-3   Injection Timing (Median)
10   115-3   Boost Pressure (Specified)
11   115-4   Boost Pressure (Actual)
12   230-2   Rail Pressure - Actual
Title: Re: misfire count
Post by: bower on July 13, 2014, 05:33:46 pm
cheers for that  :happy2: just wish it was easy to swap the injectors, if i have to strip it all to get to it i may aswell just put a new injector in.
i have looked at those on vcds but it may aswell be in a different language lol
Title: Re: misfire count
Post by: bower on July 13, 2014, 06:01:14 pm
anyone tried bg44k injector cleaner or is it the same rubbish as redline?
also if i use the wynnes egr cleaner do i have to do an oil change?
Title: Re: misfire count
Post by: Saintsteve on July 13, 2014, 06:21:31 pm
Replace the injector on the effected cylinder.Carbon build up being the main cause. clean the others and replace the duff one to cure .

That will cure your issue.

Extremely common fault on cars over 60k and getting more and more common.
Title: Re: misfire count
Post by: bower on July 13, 2014, 06:24:54 pm
mines on 108k so im guessing thats the problem
is there a how to replace the injector?
Title: Re: misfire count
Post by: Saintsteve on July 13, 2014, 06:29:03 pm
mines on 108k so im guessing thats the problem
is there a how to replace the injector?

Perhaps check on you tube for how to replace injector on 2.0TFSI.

I gave my car to JKM to sort.
Title: Re: misfire count
Post by: GrayMK5GTI on July 13, 2014, 09:43:37 pm
mines on 108k so im guessing thats the problem
is there a how to replace the injector?

Perhaps check on you tube for how to replace injector on 2.0TFSI.

I gave my car to JKM to sort.


You need a special tool to remove TFSI injectors. Looks like a pig of a job  :sad1:
Title: Re: misfire count
Post by: bower on July 13, 2014, 09:49:05 pm
great  :scared: whys this car so hard to work on!
Title: Re: misfire count
Post by: bower on July 13, 2014, 10:26:04 pm
want to try the wynnes egr cleaner but just changed my oil, so if i do use it do i have to change the oil again?
Title: Re: misfire count
Post by: Saintsteve on July 14, 2014, 02:06:49 pm
want to try the wynnes egr cleaner but just changed my oil, so if i do use it do i have to change the oil again?

Tried it, didn't work, helped but missfire comes back.

And no you don't need an oil change
Title: Re: misfire count
Post by: GrayMK5GTI on July 14, 2014, 02:16:59 pm
want to try the wynnes egr cleaner but just changed my oil, so if i do use it do i have to change the oil again?

Try BG44k just before you change the oil again.

Tbh running a can through midway between oil changes won't do any harm, it's just not a good idea to run lots of injector cleaner bottles through the system.
Title: Re: misfire count
Post by: bower on July 14, 2014, 07:25:09 pm
thanks for your help  :happy2: seemed slightly worse on way home from work  :scared: