Concerned! 01 QX4 (124k).. Cold Start Rattle for Few Seconds

[Legend11]

Hello,

I have searched and searched and I still can't find a relieving solution to my problem. I bought a 2001 QX4 last month and it has continuously made a rattle noise that only lasts for a 1-3 seconds on a Cold Startup (first thing in the morning or after sitting for a while). Google searches have found that this is a TSB and known issue on later model Nissan cars; the cause being failing Timing Chain components (hydraulic lifters, timing chain and timing chain tensioners, etc...) The cause is a result of poor oil pressure which builds up after the 1-3 seconds and tightens the bet. During that initial start, the chain rattles around causing "excessive wear" with the potential for serious engine damage if left untreated: http://www.denlorstools.com/autoblog/20 ... -start-up/

I can't be the only person experiencing this... It seems so common according to my web searches. Thoughts?

[Legend11]

My Dad also owns a 2001 QX4 with more miles (146k) and does not have this issue. I continuously hear that this is "normal" with Nissan vehicles. I cringe when I hear it in the morning. Going to try another oil change (last change was 1600 miles ago) with a better quality filter tomorrow

[Mark Sheriff]

it'll also be good to check all heat shields under the car, unless your 100% sure its timing chain related

[Legend11]

BUMP...

Still surprised that anyone else hasn't had this issue. I was hoping a few more oil changes would have helped, but it is still there.

It doesn't happen every time on cold starts. Also, so some mentions of timing tensioners and worn timing chain guides. Might investigate this, but it seems like a big job to fix it right