When starting our 2.5 SL in the morning it will often clatter or rattle for about a second or less. I've searched the forum and found a couple of suggestions. One is that the VTC gear on the intake cam is making the noise and the other is that the cam chain tensioner is slow in filling with oil (i.e. hydraulic pressure) and it is causing the noise. Sometimes it rattles when we first start it and other times it does not. Once you start the engine, then turn it off it, then restart it, it nevers rattles.
I can live with it but my wife hates it and if the wife ain't happy, nobody's happy.
Which problem is most likely to be causing the noise?
I have the same issue. I have O2 Altima 2.5 it has been making that noise forever now I took it to the dealer when it was under warranty and after they could never duplicate or find anything wrong with it. I hate the noise but what to do...car has about 114000+ miles on it. If you figure it out let me know good luck
Dark Slate 2008 Altima 2.5SL
No car note = #winning. 73k miles as of December 2013. Nexen 5000 Tires, Alpine CDA-9887, Kenwood KAC-X10D & KAC-X40, JL Audio CS213RGW1V, Racingline strut tower brace, 35% Tints, Stillen Rear Sway Bar. Hushmat on trunk, side panels and rear deck.
This. It's some sort of valvetrain noise. Mine's louder and lasts longer in cold ambient temperatures. Every 2.5L Altima I've driven does it.
I quit worrying about it when I got my oil analyzed, they found no abnormalities in the oil.
This one didn't do it until it got a remanufactured replacement engine put into it. The original engine died when a oil change place forgot to tighten the oil drain plug and my wife lost all the oil on the interstate. It shouldn't rattle.
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