'02 A6 w/3.0L idles rough, misfires and found low compression

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12-31-2015, 01:24 PM

#21

jcman

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Quote:

Originally Posted by krychu

Hi, my engine is 3.0 BBJ and my Audi is from Australian market. At the moment I can't inset pictures with block. I try tomorrow again.

Ok this explains it all not North American sold, sorry.
Your best bet is to start a new thread with the coolant leak, this quest for an answer has no relevance to the OP's "Original Poster" thread from five years ago.

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01-01-2016, 08:40 AM

#22

SloopJohnB@mac.com

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Looking at your pics and the gallery photos, looks like headgasket failure.

Quote:

Originally Posted by krychu

Hi Cerocool,

Can you explain, how your engine 3.0 after long time. Have you found and solve problem, I'm asking because my Audi a6 3.0 2005 probably have similar problem, now car lose 150ml coolant per 2 weeks. Last time I found coolant in 5th cylinder.

Now, why it failed is another issue. You could just clean up the block/deck and the head and install another head gasket. I wouldn't be surprised if you need to use new head bolts; the OEM ones are torque-to-yield on most modern engines for uniform clamping force. The surface texture of the head and deck mating areas to the head gasket are critical, not too smooth, not too rough. Helps to check deck and head for flatness as well.