S6 rattling issue at idle, EPC light

A6 All/ S6 All
#1

Hi,

I’m a french owner of an S6 avant from late 2006 since 2 years. I have carbon cleaned it, lots of gaskets replaced, LPFP and HPFP replaced too.

Last Thursday I have had an EPC light (G300, value too low), but with no loss of power during 10 kilometres. Then at low revs the engine started to rattle. I stopped and cleared all codes (P0366, linked to G300 exhaust camshaft position sensor, and misfires on 2, 3 and 5 cylinders). The code linked to camshaft position sensor came again immediately, then I started the car, horrible idle then the engine stopped by itself.
The car is at the carrier that took my car out, and will go to a garage tomorrow.

The carrier has replaced upon my request the VVT solenoid on this camshaft, no change.
Still have to try to replace the sensor.

Any experience on this kind of issue ?

Thanks a lot for your help.

Regards,

Matt

#2

So diagnosis done today… compression at 0 on cylinders 3 and 4… :rage:

Maybe due to a faulty camshaft adjuster, exhaust valves have maybe hit the pistons and been bent, so they probably remain open.

Engine swap to come… I will check the current engine to see if it can be salvaged later and been kept as spare.

#3

Condolences

#4

Condolences as well. How many kms on your ride to give an idea of when this can happen?

#5

Thanks. It has 221 000 km. I’m the second owner, fully serviced by Audi Switzerland by the first owner until 180 000 km.

#6

KM alone can’t be the “issue”… mine has just “turned” 300 000+ km with 0-issues in that regard, sooo :sweat_smile:

1 Like
#7

I have some news… I have removed the head cover on passenger side, and guess what ? Rocker arm broken…

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#8

Wow super sad. This is actually not super uncommon. I think this is the 3rd or 4th time we’ve seen this.

Keep us posted on how this develops

#9

I will replace the engine in the coming days. I should receive the new one next week, low mileage (90 000 km).

I will rebuild this one later, change rocker arms, defective camshaft, and the whole timing. I will keep it as spare.

#10

I’m sorry to see this, especially after all the hard work you put in.

At least you learned a lot about the car.

#11

@Matt92 Sorry for your trouble :see_no_evil:
Mine still sounds very healthy despite the high milage :crossed_fingers:

Is there any way to prevent this from happening or perhaps service some key parts before it happens… seems like quite an investment to have a spare engine sitting around and waiting for it to happen :sweat_smile:

#12

Sorry to hear about this.

#13

Tough news. Sorry, man.

#14

@CountVohn when doing valve cover gaskets, what should be inspected to possibly catch this before failure.

#15

Done the valve cover gaskets last year , I haven’t seen anything wrong… :confused:

#16

Engine received !

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1 Like
#17

Ready to be put in the engine bay…

I have had to replace the intake manifold too.

It should be ok before the end of next week.

#18

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#19

Where did you end up ordering your intake manifold from? Best of luck on the install!

#20

Oscaro.com. Pierburg ref is .08 instead of .07 on the version that was on my car (already replaced by Audi, M version of the IM).
The mechanics will have some work next week…

I will rebuild the old engine later.