MK5 Golf GTI
All Things Mk5 => How to Guides / Troubleshooting => Topic started by: jimmy-s3 on January 06, 2011, 08:34:36 pm
-
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?
-
Sh*t fuel?
If you have changed everything else it would only leave injectors I'm afraid.
-
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??
-
Does it do it when switched to revo's stock mode?
-
Its been remapped by custom code and ive never been able to switch it back to stock mode!?
-
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.
-
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??
-
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
-
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!
-
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.
-
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.
-
At what rpm dose the misfire occur and dose it do it through out the rpm band?
-
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.
-
Yep, tried that DOMT!
It MUST be the injector?
-
Hmmm, nothing is ever for certain, looking likely. Perhaps PDT/BDMAlex may want to put some additional info here as traders.
-
UPDATE.
Before tackling the injectors i had a compression check done on the car to make sure it wasnt a cylinder that had worn out! All cylinders tested full compression :happy2:
Cleaned the MAF sensor with some Carb cleaner and refitted once dried out, drove the car and it feels alot better. Replace the cam follower too while i was messing about with the car!
Took the car to have a vcds check and the missfire has gone!
Now its showing Evap system fault and oxygen sensor faults??
How the hell has that happened?
-
hi jimmy, might be talking out of my rear end but i remember somewhere i was told not to spray the MAF with carb cleaner, i went to do it on my MK4 GTi (they all had lots of issues with the MAF) and a reputable mechanic (who i trust) said not to. Not sure if this info helps?
-
Ive had a couple of people saying to do it and a couple saying not to!
Thought id try it first rather then spend £110 for a new one.
It seemed to go alot better once it was cleaned tho!
-
i totally agree jimmy, have you got VCDS? if so clear the DTC's take her for a blast and see what comes up after :happy2:
-
A Freind has! Ive has them cleared today. Will gat the check done again in a few days!
-
There is a special toolkit for the injectors mate.
-
what do you mean STU?
-
To remove and install injectors requires a special toolkit. It's not just a case of popping them out.
-
Oh yeah, i know STU cheers!
-
Another thing with my car at the moment, when i start it up from cold, sometimes the car ticks over at normal rpm and sometimes at a higher rpm. Obviously at higher rpm the " choke" or cold start valve is working away as it should, but why not at other times when starting from cold?
When i pull away when the cars in "choke" mode, it doesnt rev very easily and seems to stutter as if its out of fuel,as soon as the revs die back down, it drives normal??
Could this be linked to my other problems?
-
im willing to bet its the PCV valve going.
read somewhere that if your revs stay high then its a cause.
-
Where is it on the engine?
-
Under the top engine cover, top of the engine towards the front, just behind the diverter valve, if it's the same engine as the ed30
-
hi jimmy i had a missfire on my Gti last year on cylinder 3, after moving coil packs,data logging and swapping plugs etc i swapped the injector and all was solved in my case, it had me pulling my hair out :signLOL:
my car would randomly missfire underload mostly in 3rd gear and only after it had warmed up
-
Any pics steve?
-
Any pics steve?
http://www.golfgtiforum.co.uk/index.php?topic=180206.msg1686581#new
Picture in 2nd reply. :happy2:
-
I bought a new PCV the other week, £30, the one I took off was revision 'F' the new one was 'N' so looks like there has been issues with them. I also bought a new MAF which I didnt need as my old one was fine, that was £108.
Good luck with finding your fault. There was nothing wrong with the PCV, you can have it to try if you want, Its only sitting in my shed.
-
Where abouts are you at?
-
Seaham, 20 mins from middlesborough. Got vcds aswell if u need a scan doing.
-
Ill have a look at mine at the weekend and let you know how i get on!
Your ideal, only being 20mins away too :happy2:
-
Sounds like a coil!