These engines have a problem with two of the timing chain tensioners, there are three of them. There is actually a service bulletin regarding this problem and updated parts. Unfortunately it is pretty difficult to get at these parts and it is not cheap to do the job. You can probably expect to pay up to $1200. for a dealership to do this job. They may try and help you a little considering the parts were faulty and have been updated but they are not obligated to legally. It is very important that you take care of this problem as the chains will eventually fail because of this problem and destroy the engine. Here is the number of the bulletin:
Reference: NTB07-042A
Date: April 17, 2009
ACTION:
1. Replace both secondary timing chains and both secondary timing chain tensioners with the ones from the Parts Information section of this bulletin.
2. Change the engine oil and filter.
Hope this helps,
Dave
If you want, google: "VQ timing chain"
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