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View Full Version : Passat 2.8 time belt jumped a few teeth on one cam



badbeny13
03-12-2014, 08:19 PM
So the other day I went to start the car and it started but with a hesitation, then a really rough idle. i turned the engine of immediately and pull the timing belt engine covers. I looked at the cams and saw that the cam on the left looked like it was off from the right. So then i pulled the codes and got P0340 cam position sensor circuit malfunction. now I'm stuck deciding on how to fix my problem. Should i just buy a used head thats in good condition or just part the whole car out? The car doesn't have any other problems and ran perfectly before this. The timing belt was done about 20k ago and it still is good condition. Any advice or tips would be great.http://i20.photobucket.com/albums/b236/badbeny13/81819b9c-3a1f-4996-a77e-5d4ac281e544_zps58204a1d.jpg (http://s20.photobucket.com/user/badbeny13/media/81819b9c-3a1f-4996-a77e-5d4ac281e544_zps58204a1d.jpg.html)

diagnosticator
03-23-2014, 03:05 PM
No offense, but I don't believe the sequence of events. I would not recognize one cam off from the other, without lining up the timing marks, for example. How do you know you need only one cylinder head? It is unlikely the valves are bent if it only skipped a few teeth on the cam sprocket. Fix the engine if the car is good otherwise.

badbeny13
04-04-2014, 06:00 AM
a 2.8 engine is a interference motor therefore if it is off just a couple of teeth there was some type of contact between the valves and pistons, correct? also it through a DTC Code for bank 1 cam timing.

what2dowiu
04-20-2014, 05:04 AM
Put it back in time run a compression test
bet it will be fine