Can I replace the timing chain tensioner on a 2001 Audi A4 by simply removing the valve cover? Is there an adjustment? My engine is noisy at idle and I'm getting a CEL code of P0011. I've had the code reset and it comes back. One time it came back as P0012. Which makes me think its the tensioner. How hard is it to adjust or replace?
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Re: chain tensioner adjustment, 2001 a4
The tensioner,should be automatic,and if there is a noise,or you are going to go into the timing chain area,you will have to remove the timing cover.And if you do,on this engine,replace all timing components so you will not have to go back into the timing cover.
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Sounds like a bad valve lifter or a valve out of adjustment. It's probably a bad hydraulic valve lifter. In idle, when the oil pressure is lowest, it is not filling with oil. When the motor revs up, oil pressure rises and fills the faulty lifter.
If you do have mechanical lifters, the valve is probably out of adjustment. If you do car work, pull the valve cover and see if it's adjustable. Of course, you'll need the specs from VW/Audi.
Otherwise, it's probably a shop job.
Audis are not very common in mycountry but from what I can gather:
Themark for the crankshaft gear is on the cover you have to remove inorder to get at the timing belt. The sprocket you may be having troublewith is the intermediate shaft (in front of the water pump) and I don'tbelieve that one matters at all since it doesn't drive any of the cams.The intake cams are driven by a chain off of the exhaust cam shaft soonly the exhaust cam is driven directly by the timing belt.
Depending on the period of time and intensity of the knock ? If it is a rapid short ,loud knock then disappears altogether you may be dealing with a cam chain tensioner that is loosing oil pressure when the car is standing. A loose cambelt tensioner can increase the noise .