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Old 06-10-2010, 03:07 PM
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Clatter/rattling noise when starting a 2.5 SL

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?

Thanks,
Hap
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Old 06-12-2010, 05:23 AM
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Possibly low on oil will make the top end of the V6 makes some clattering noises for a bit I've heard, not sure about the 2.5L. Check it out after it sits for at least an hour.
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Old 06-12-2010, 08:24 AM
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2.5's do have that issue as well after the oil settles.

2 options...

Get a different car...
Start the car for the wife

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Old 06-12-2010, 10:42 AM
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Oil level is not an issue. I've ruled that out already.
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Old 06-12-2010, 02:10 PM
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FIXED
Quote:
Originally Posted by bt2580 View Post
2.5's do have that issue as well after the oil settles.

2 options...

Get a different car...
Start the car for the wife
Get a remote starter installed

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Old 06-12-2010, 03:18 PM
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Yeah,...thanks for the technical advice. Nevermind, I was looking for someone with experiance on the subject.

Last edited by Hap Call; 06-12-2010 at 09:08 PM.
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Old 06-13-2010, 05:24 AM
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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
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Old 06-13-2010, 06:36 AM
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My 2.5 does the same thing.
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Old 06-13-2010, 09:24 PM
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i have a 3.5 and a machanic said that it was something called a timing chain, and that only the dealer can fix it.
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Old 06-13-2010, 09:29 PM
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Quote:
Originally Posted by animalfries2 View Post
i have a 3.5 and a machanic said that it was something called a timing chain, and that only the dealer can fix it.
Well some older 3.5s have an issue with the timing chain tensioner wearing out. That may be what your mechanic was referring to. Search for it, you'll find more info.
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Old 06-13-2010, 09:33 PM
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yup mine was my timing chain
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Old 06-13-2010, 11:59 PM
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I have the same issue. http://www.nissanclub.com/forums/eng...ne-rattle.html
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Old 06-14-2010, 01:41 PM
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Quote:
Originally Posted by bt2580 View Post
2.5's do have that issue as well after the oil settles.

2 options...

Get a different car...
Start the car for the wife

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.
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Old 06-14-2010, 06:51 PM
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Quote:
Originally Posted by GirchyGirchy View Post
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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Old 07-10-2010, 12:42 PM
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No more rattle when the engine starts. I changed the VTC gear and that fixed the problem. I also adjusted all the valve clearances because I found over half to be either out of spec or borderline.

Now the engine starts without any rattle and it runs VERY smooth.

Thanks to those who's input was sincere.

Hap
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