Cant work out why its misfiring HELP

[Audiman99]

Hey, basically at around 3000-4000 revs it will hesitate and seem to misifre for a second or so then carry on as normal. I just took it for a test drive and as it misfired, a puff of smoke came from the exhaust. First time i've noticed this, don't think it does it everytime.

Car idles fine, and if I keep below 3000 revs drives brilliantly. I've recently cleaned the MAF, throttle body, injectors, replaced fuel filter and a few hoses that looked knackered also checked and tigtened everything up. Car was fully serviced about 4 months ago by myself.

Vagcom says I have no errors except the low MAF signal from when I disconnected it, still misfired with it unplugged.

I'm guessing if it was a coilpack or sparkplug it would show in vagcom and I would get the flashing icon on the dash. Only thing I haven't checked is DV but it sounds like its working fine.

Any ideas guys?

Allan

 

[s3dave]

Did you go for the recall? coilpacks breaking down dont always show on vagcom as there may be a weak spark

 

[beachbuggy]

Coilpack.

 

[Audiman99]

I went for the recall last week, but unfortunately as my coils were not originals I was sent away empty handed. I know since I've owned the car I've had to change coils 1 and 2, as they misfired and gave me a vagcom fault. But 3 and 4 as far as I know are originals, so maybe Audi being lazy or just trying to mug me off!?

Any easy ways to test the coils? If I swap them around will the misfire move to a different rev range?

Thanks

Allan

 

[s3dave]

What make are the 2 replaced? not heard great success with cheaper unbranded coils esp with a remap

 

[s3 Hoggy]

I had exactly the same problem was a coilpack, mine was on cylinder 4

 

[Audiman99]

I'm not too sure on the brands, most probably from eurocarparts or vwspares. I guess a trip to Audi is needed again, i'm pretty sure the parts guy is getting sick of seeing my face i'm in their every week!

 

[s3dave]

With the puff of smoke you are seeing strongly suggests unburnt fuel from a partial misfire, so yes i would get at least a couple..

 

[Audiman99]

Thanks for the help. Ill pop to Audi on my next day off. Anyone know how much they go for?

 

[s3 Hoggy]

around £35 now mate

 

[Audiman99]

cool thanks Hoggy

 

[Stanley]

I've just fitted another coil to mine tonight. So far numbers 3 and 1 have gone in 6 months. Replaced with used VAG ones. Free of charge ;-)

 

[steve bain]

maybe i'm a tight ****, bu get a pair genuine ones off bay for cheap. then go back for the recall?

 

[DaveA3]

maybe i'm a tight ****, bu get a pair genuine ones off bay for cheap. then go back for the recall?

**** it i would. try a different audi garage if theyve already seen the car

 

[Audiman99]

Hey, just a quick update. I changed coils 3 & 4 which turned out not to be original but some cheap brand, probably from ebay. I left 1 & 2 as they were fairly new anyway. The car has never pulled so well and the misfire has gone! Actually don't think its driven this well since I bought it. Anyway I'm happy again, thanks for the help.

 

[s3 Hoggy]

good to hear pal!