Missfire is back!

[jimmy-s3]

Had a vagcom check on my gti and it came up with cylinder number 1 missfire, so ive replaced the ignition coil and its still the same. Ive checked the rest of them and they all look fine, even the one i replaced looks fine to me!
Ive also had the plugs and fuel filter replaced about 1000 miles ago.

Any ideas?

[KRL]

Sh*t fuel?

If you have changed everything else it would only leave injectors I'm afraid.

[jimmy-s3]

Im not sure it is the injectors?
It does feel like its a coilpack failing, if you floor it in the dry in 1st or 2nd it either spins till the ESP cuts in or stutters and makes a popping sound as if the coilpacks are failing. In 3rd gear when you floor it, it stutters and hesitates but does not make the "popping" sound!?

What controls the coilpacks??

[Saint Steve]

Does it do it when switched to revo's stock mode?

[jimmy-s3]

Its been remapped by custom code and ive never been able to switch it back to stock mode!?

[Saint Steve]

Oh dear....... Custom code....

can't they re install your stock map so you can check the basics are working fine 1st before going any further.

[jimmy-s3]

The remap was installed somewhere down south and the local custom code dealer said it has to go back to where it was installed!
What a load of BOLL&&ks!

Could it be a faulty MAF sensor??
Ive drove the car with the MAF sensor disconnected and it seems to drive slightly better??

[winrya]

The remap was installed somewhere down south and the local custom code dealer said it has to go back to where it was installed!
What a load of BOLL&&ks!

Contact custom code, you will probably have to pay for the time (hopefully under £40 and hour) but I'm sure any custom code dealer will be able to help you

[ennvee]

Had a vagcom check on my gti and it came up with cylinder number 1 missfire, so ive replaced the ignition coil and its still the same. Ive checked the rest of them and they all look fine, even the one i replaced looks fine to me!
Ive also had the plugs and fuel filter replaced about 1000 miles ago.

Any ideas?

Hey, that sounds exactly like what was happening to mine.  It was Cylinder 1 also! Mine was the injector.

If you have already replaced the coil pack and the plugs and fuel filter are new I reckon its the injector :(   

Just make sure you dont go to a rip off dealer like I did!

[jimmy-s3]

ENNVEE, that sounds promising!
Im going to attempt to remove the injectors at the weekend and either get them cleaned proffesionly or replace them(ive been offered a used set).
The guy at Teesside auto tech said to me 99% of the time the injector is as good as new when cleaned by them. They put them in an ultrasound bath to break down the carbon build up then fit new filters and seals to them for £12 each.

[ennvee]

If that works then thats great!  Beats paying £125 for one.

My worry with mine is the fact that the warranty is only replacing the one that is faulty so i'm either waiting for another to go or take the plunge and replace / clean the rest.

Might need to see if there is anyone in Aberdeen who does that.

[bobsey]

At what rpm dose the misfire occur and dose it do it through out the rpm band?

[Poppa Dom]

Have you tried moving the cylinder 1 coil pack on to another cylinder, put some mileage on the car and re-scan with VCDS to see if the misfire has moved cylinder. If it has it would suggest a failing coilpack - if it stays on cylinder 1 then clearly another issue, most likely injector.

[jimmy-s3]

Yep, tried that DOMT!

It MUST be the injector?

[Poppa Dom]

Hmmm, nothing is ever for certain, looking likely. Perhaps PDT/BDMAlex may want to put some additional info here as traders.