2005 B6 VW Passat 1.6 FSI / P0300 misfiring please help :-)

DOBBER112

Hi folks, I'm having a P0300 misfires problem with a 2005 B6 Passat 1.6 FSI. So far all spark plugs and coils have been replaced and still the engine runs rough. When the car is started its idles perfectly for a few minutes then the engine management light begins to flash and then the engine begins misfiring and runs very rough. When the engine is turned off and started up again the process starts over again. First running fine and then runs rough. Also worth a note that the mechanic that changed the plugs for me noted that the plugs he removed although only in there 6k klms after full service were now black. I did have 1 or 2 rough starts over the last few weeks but other than that the car was fine until the engine management light came on and it began misfiring and running rough. Any ideas what the problem is? I'm not minted enough to keep throwing money at this problem. Thanks for reading

bbability

Sounds like the cam shaft position sensor is faulty.

DOBBER112

bbability wrote: »

Sounds like the cam shaft position sensor is faulty.

Thanks for the reply :-) would the camshaft position sensor not have its own code to point me in that direction though? Is it easy to get at? Just spotted one online for €35. Sorry about all the questions only I've already wasted money on parts and it did nothing to sort the problem.

Saucy McKetchup

Sometimes a problem with the MAF can throw up a misfire code

bbability

DOBBER112 wrote: »

Thanks for the reply :-) would the camshaft position sensor not have its own code to point me in that direction though? Is it easy to get at? Just spotted one online for €35. Sorry about all the questions only I've already wasted money on parts and it did nothing to sort the problem.

It's normally handy enough to get at. Just make sure you get the right one.

enumbers

What mileage is on the car. If it was one of mine I would be checking the timing at this stage.

DOBBER112

enumbers wrote: »

What mileage is on the car. If it was one of mine I would be checking the timing at this stage.

110,000 Kilometres and has been serviced every 10k

enumbers

with no other fault codes or obvious issues I would check the timing and check for any compression issues

DOBBER112

Mechanic is still working on the car, has tried all the obvious problems like plugs, coils, connections and so far the car is still misfiring but only when idling when driving its smooth as it should be. So far he thinks it could be the injectors or ECU.
Hopefully not the ECU...Part alone is €1,000 :eek:

George Dalton

Has the timing been checked?

enumbers

I have mentioned this twice on this thread but no response so would assume not.

George Dalton

enumbers wrote: »

I have mentioned this twice on this thread but no response so would assume not.

And we both know without even seeing the car that it probably needs a timing chain :pac:

enumbers

Wouldn't beyond the realms of possibility

DOBBER112

George Dalton wrote: »

Has the timing been checked?

This I will inquire about tomorrow as I'm not 100% sure if he has checked the timing chain. This would also be a hefty expense job would it not?

George Dalton

Yes quite expensive. To check the timing you need the specific timing tools for this engine.

DOBBER112

George Dalton wrote: »

Yes quite expensive. To check the timing you need the specific timing tools for this engine.

Either way I'm goosed

The great VW con eh...back the Japanese motors for me I reckon :rolleyes:

DOBBER112

George Dalton wrote: »

Yes quite expensive. To check the timing you need the specific timing tools for this engine.

Turned out to be a faulty injector, car is running perfect again after the defective one was replaced :-)

jca

DOBBER112 wrote: »

Turned out to be a faulty injector, car is running perfect again after the defective one was replaced :-)

Nice one:D