Question about 2005 Nissan Altima
If this is the 3.5L V6 engine;
There were two common problems that can cause this. This engine had problems with secondary timing chain tensioners that wore out and need to be replace at fairly low mileage. There will be a service bulletin regarding this repair and updated tensioners that must be installed. Unfortunately, your dealer is best suited to do this as it is a complicated job and you don't want a beginner doing it. Some shops may recommend doing the entire set of timing chains, but this really isn't needed, just the secondary tensioners. The other problem relates to small screws that can fall out of one of the many throttle plates inside the intake runners. I believe there is a bulletin regarding this problem as well. When the screw falls out, it is ingested into the engine and actually gets imbedded in the piston and can sound just like a lifter as it comes up and bangs into the head. Unbelievably, the fix for this problem is to rev the engine sufficiently so that the screw gets hammered into the piston far enough so that it doesn't hit anymore, and then remove the intake to replace the screw(s) and locktite the rest of them. There is a fair bit of info on the web about this, google: "VQ35 noise" add "tensioner" if you like as well.
Posted on Jul 04, 2010
This engine doesnt have a timing chain it has a timing belt, check your oil level low oil presure could be causing valve clatter
Posted on Jul 04, 2010
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Posted on Jan 02, 2017
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