How to measure 3.2 V6 timing chain stretch with VCDS. - Club Touareg Forums
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post #1 of 62 Old 11-24-2014 Thread Starter
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How to measure 3.2 V6 timing chain stretch with VCDS.

According to a french forum it could be possible to measure the timing chain stretch with VCDS.

Go into groups 208 and 209 at idle and note the 3rd value. Both should be between -6 and 6 AND the two values should not be further apart than 4.

In my case, both values is -6 and then the difference is 0. So it's borderline to stretched.

Can anyone confirm or do their own measurement?

I have my own theory about my values. The chain is not stretched, hence both is -6, but I should re-prime the tensioner to get the values closer to zero. Or it might be the other way around.
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post #2 of 62 Old 11-24-2014
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Interesting. Not seen that before.
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post #3 of 62 Old 11-25-2014
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Please let me know when you find out. I purchased a new tensioner and will install soon.
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post #4 of 62 Old 11-25-2014
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Quote:
Originally Posted by benb2376 View Post
Please let me know when you find out. I purchased a new tensioner and will install soon.
VW had a technical Bulletin 15 07 03 Jan 31 2007, 2010614 concerning MIL ON with DTCs P1347/17755 and P1340/17748 related to elongated timing chain. In VAS 5051/5052 if field 3 measurements in display group 208 and 209 are less than
-8.0 KW (-9.0 to -14.0 KW) and if both speed sensor and camshaft sensors are OK - Replace upper timing chain

Not certain how VAS relates to VcDs but as you indicated the stretched chain can be determined. Replacing the tensioner will not help if the condition is to advanced but for the cost of the tensioner would not hurt to try.
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post #5 of 62 Old 11-25-2014 Thread Starter
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Great find on the TSB. It's the same values, but the "safe" zone seems to be between -8 to +8. Both VAS and VCDS use degrees KW as well.
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post #6 of 62 Old 11-25-2014
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Quote:
Originally Posted by iSagen View Post
Great find on the TSB. It's the same values, but the "safe" zone seems to be between -8 to +8. Both VAS and VCDS use degrees KW as well.
I have been driving my car for over six months with CEL on. My chain is stretched. I can hear it quite clearly until engine temp and oil temp are 200 F. After that no problem. Now that it has gotten really cold the noise is very noticeable at start up. Will have it corrected in the spring unless it gets worse. To mitigate am changing oil more often. If you are at -6 you should be able to hear your upper chain slapping around. It will sound like marbles rolling around in a can mid point of the upper dash. Don't think the tensioner will resolve the issue. You should be getting camshaft position correlation codes which are generally a good indicator of a stretched chain if the sensors are fine otherwise. If you are not getting the codes the tensioner may help. My bet and experience with same engine is the upper chain is stretched. Best thing for the 3.2L is to keep the oil fresh. Screw the manual, change oil at half the interval or no more than 3/4. It costs a lot less than pulling the engine to change the upper chain. To bad VW used an engine meant to be transversely mounted in the V6. OK if they left enough room between the firewall and block to change a damaged chain but no such luck.
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post #7 of 62 Old 11-26-2014 Thread Starter
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Luckily I have no codes, yet.
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post #8 of 62 Old 11-26-2014
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How many miles are on your timing components?

2004 - V6 3.2L - Touareg,
Air Suspension, No custom Mods
~150k miles in Louisiana, USA
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post #9 of 62 Old 11-26-2014 Thread Starter
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I suspect it's close to 100k miles now.
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post #10 of 62 Old 11-26-2014
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Quote:
Originally Posted by iSagen View Post
I suspect it's close to 100k miles now.
I have 41K miles. Think my problem started with the upper tensioner. It was not extending properly and actually was slightly out of plumb. Not certain at what measurement you will start getting codes but at -6 imagine you may be getting close. Would think you could hear slightly. In any event if you start getting camshaft crankshaft correlation errors don't be so quick to replace. If the car starts and runs the crankshaft sensor is fine. If one of the crankshaft sensors goes bad you will know as the car will take noticeably longer to crank, or that is how it was for me.
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3.2 , stretch , timing chain , vcds

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