04 touareg V8 cam timing chain tensioner - Club Touareg Forums
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post #1 of 32 Old 03-28-2012 Thread Starter
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04 touareg V8 cam timing chain tensioner

The low oil pressure warning light came on and had noisy lifters on cyl's 5-8. I put in a mechanical oil pressure gauge and saw that I had 75 psi cold at idle and 50 psi after the car warms up a little. Pulled the valve cover off and noticed the cam chain was loose. I ran the engine w/ the valve cover off and saw oil squirting out of the chain tensioner, ( the orifice in the plastic guide) and the chain didn't tighten up. I assumed the chain tensioner failed and replaced it w/ a new one for $640 for the part alone. When I first started up the car the chain tightened right up and everything sounded great, no oil shooting out of the center hole. After it finished the cold start mode, I noticed the chain had slack again and started making they loud lifter noises and was squirting oil out the center hole again. Either I experienced infant mortality on the tensioner or there is something causing the tensioner to vent the oil and slacken the chain. Does the variable timing slacken the chain to retard or advance the timing? Could something like the cam position sensor be bad.

I am out of ideas, any thoughts would be appreciated.

Marc
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post #2 of 32 Old 03-28-2012
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I'm puzzled. The V8 has a timing belt not a chain.
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post #3 of 32 Old 03-29-2012 Thread Starter
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Yes there is a timing belt but there is also a chain for the dual overhead cam.
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post #4 of 32 Old 03-29-2012
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Yes it is tensioner chain under the valve cover. This is very tricky and specialised problem.
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post #5 of 32 Old 03-29-2012
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From Bentley this is the oil pressure spec for the V8 engine oil over 80 degrees celcius.
  • Check oil pressure at different speeds: 2000 rpm: 3.0...5.5 bar over 2000 rpm: maximum 7.0 bar
So that's all the facts I have. From here on out its all random thoughts and guessing.

It looks like you are probably within that range, but I wanted you to see the spec.



I wonder if you are using the right viscosity oil.



I am almost thinking that squirting oil is the normal behavior of the part. I would also wonder whether there is some other problem that is causing the tensioner to back off too much such as a bad or no control signal or controller (whatever the heck controls the tensioner).


Do you have any codes?


Probably not much help. Good luck.

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post #6 of 32 Old 03-29-2012
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Not your instant answer, but some education on how it works might help pave the way. For the initiated, this is for the 2004-2006 AXQ 4.2L engine.



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post #7 of 32 Old 04-01-2012 Thread Starter
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So my problem with my cam chain tensioner is electrical at the plug not the unit itself. Cold start mode I have 12V going to the tensioner and have good tension. After the short warmup, the chain tensioner drops down. I unplugged the connector on the tensioner and put 12V from another power source to the contacts and the tensioner went right up and the engine sounded great. Take it away and the tensioner drops down and get the loud lifter noise. I measured the power at the connector and only had 10.5 volts.

Why do I have low voltage there? The only thing I can think of is a bad cam position sensor. I also have the low oil pressure warning after cold start mode. I am wondering if its low voltage to a bunch of things causing a bunch of problems.

Any thoughts?

Thanks,

Marc
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post #8 of 32 Old 04-02-2012
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To answer that question, you would have to take some voltage measurements and see. Assuming your voltage is OK, you might want also to check out some Audi forums for some input as the 4.2L V8 has been used in Audis.

Wild-a## guess time. Perhaps you have a bad oil pressure sensor. Perhaps its reading low puts the tensioner in a default mode to preserve oil pressure for lubrication.

I see that only one side is affected. Have you tried swapping the electrical connectors between sides to see if the behavior switches with it?

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post #9 of 32 Old 04-12-2012 Thread Starter
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replaced the ecu

I replaced the ecu w/ one from a junkyard. I have the code 17978 engine start blocked by immobilizer p1570 - 008 implausible Signal. Does anyone know about recoding the ecu?
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post #10 of 32 Old 04-30-2012
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Any updates to any of these unknown and interesting issue(s) of yours?



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