For the last could of months I have noticed a very slight intermittent judder every now and then. This was barely noticeable and i wasn't sure if it was just the road surface.
A few weeks after I got a low oil warning light, which was a little strange as it was only half way to its next oil service.. I topped the oil up and light went away. The next day the
engine light started flashing more regularly, so I got a local garage to scan the car, they told me cylinder 1 was misfiring and was likely to be the coilpack. I then change he coilpack,
which seemed to fix the problem for about a day, next day light starts flashing again and then finally ends up staying on.
Next scan results in P0300, P0301, P0302, so I took it to a VW specialist to check out whats going on. After switching the coilpacks/spark plugs/fuel injectors they came to the conclusion
that cylinder 1 fuel injector has faulty and told me that only cylinder 1 seemed to be playing up. So no fuel injector fitted and back on the road! This fixed the issue again for around a day,
now once again I have a multiple misfires.
The car seems to be misfire at idle every couple of seconds mainly on cylinder 1, but also every now and then on ALL the other cylinders, however the car did not seem to misfire whilst the car was being revved.
We then took the car for a drive with VagCom plugged in, again we noticed that whilst accelerating the car did not misfire at all, and only started when slowing down for junctions.
I am not sure why the mechanic didn't notice that the misfires were occurring on all cylinders, but now I am back to square one
I have since been told that they have tried replacing all the sparkplugs too,but cylinder 1 is still misfiring... They have told me that the compression is fine, the engine timing seems fine and the maf is ok, next step for them is to open the engine up to check for internal damage!!!
I have already paid out a lot of money and don't seem to be getting anywhere! I am thinking about taking the car to the main dealer now see if they can figure it out.
The car has full VW service history, Revo stage 1 and BSH intake (both of which have been fine for 10k miles previous to this problem)
What is annoying is the car still drives perfectly with no lack of power, just a slightly ruff idle.
Anyone got any idea of what could be the issue? Does this mechanic know what he is doing or should I get my car to VW before I get another big bill for opening up the engine?
Note:
The car has only ever thrown the following errors;
P0300, P0301, P0302
The misfires were noticed on the live count.
