Help with engine noise / 17755

[os2firefox]

I was driving the audi home from work one day and noticed that the engine sounded like a diesel. Appears to be misfiring from the three cylinders on driver side of the engine.

Vagcom is showing the following code:

17755 - Camshaft Position Sensor 2 (G163) / Engine Speed Sensor (G28)
P1347 - 35-00 - Incor. Correl.

We pressure tested the cylinders and saw that the cylinders on the bad side were ~70-90psi and the cylinders on the good side were ~120psi.
We also replaced the G163 sensor on both sides without any change in results.

Video: https://plus.google.com/100727269628...ts/VNRA1N7nuD7

Does anyone know if this sounds like a cam tensioner or something else?

[CELison]

That sounds like heavy lifter tapping or a cam tensioner. I had a lifter collapse on me, not fun

[zillarob]

Oh dear, check you timing belt. Correlation code is no bueno. Hate to say it, but Im guessing you have some bent valves.

[os2firefox]

Oh dear, check you timing belt. Correlation code is no bueno. Hate to say it, but Im guessing you have some bent valves.

I was hoping that wouldn't be the case... Any ideas why the timing belt would only affect one side of the engine and not stop the car from running (catastrophic failure)?

[zillarob]

tbelt can skip on any or all of the 3 pulleys that matter, depends on what causes it to skip. If the cam sensor is out just a little bit you will get an implausible code, correlation means it is not even in the neighborhood. My guess would be b2 skipped a few teeth and the center intakes are tweaked. Our valves are easy to bend (better than breaking off) so the motor keeps spinning.

Quickest way to check is pop the tbelt covers off and eyeball where the cam bar goes or just pop the valve covers off and see if the notches on the cams line up at the same time. Going to be in there soon anyway.

[os2firefox]

Ah, thanks for the insight :)

[os2firefox]

Darn... took it apart and saw this:



That's the bolt holding the timing belt tensioner :/ All the plastic covers were ripped by the timing belt. I wonder how the car didn't just explode before I got home ><

[CrazyRobCustoms]

^ Gooooo. over stretched/ tightened bolt you got there..That sucks.

[os2firefox]

It was tightened to spec using a torque wrench :/

[bps4]

It was tightened to spec using a torque wrench :/

Damn.. How did you tension the belt?

[CrazyRobCustoms]

It was tightened to spec using a torque wrench :/

Yeah but it a single use stretch bolt. Nobody replaces them. Prob been loosened then tq more than once.