Quote:
Originally Posted by epowers777
So your saying it's something in the valve train. I had a friend look at it he said it's not a rod nock. My idle is also really low.
So what is your suggestion. I'm positive it's cylinder 3 or 4.
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I'm saying the tapping sounds like it is tapping at a speed that is approximately half of the expected idle speed. So with that in mind I'd be looking at camshaft / valve train related areas first.
I think it would be a good idea to remove the rocker arm sets from the engine and examine them. Whilst they are out I'd feel the camshaft up for any noticeable movement. If this turns out not to give any obvious possibilities I'd remove the chain tensioner and the sprocket from the camshaft and then see if there was a camshaft related problem.
If that wasn't it then I'd be looking at the chain tensioner and how that goes back together. Oil pressure is used to help the tensioner do its job. If there is a blockage or the tensioner is worn then you might get a bit of flapping from the chain.
If you remove the chain tensioner be sure to follow the chapter in the FSM for proper installation.
http://www.startekinfo.com/StarTek/outside/12265/disc_2/program/Engine/617/05-310.pdf