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Greetings everyone. So my Fronty is crowding 30k miles and has suddenly developed a loud engine noise on coldstarts for a few seconds. After mentioning the situation to the dealer, they arranged to take a peak at it.

When the service manager started it cold, the engine made its noise. He felt the noise could be related to the timing chain, but said my motor was the loudest one he has heard. He felt that driving it much may be a bad idea, as he wasn't totally sure what the noise was and wanted to have his techs. listen to it.

Two technicians felt it was not related to the timing chain but felt instead the noise to be the result of piston slap. Their recommendation was that the motor be replaced.

Without ever listening to the truck, Nissan is refusing to replace the motor or even investigate it further. Nissan in fact when on to say that maybe running synthetic oil in my motor is bad and should try regular oil.

My dealer is trying to help resolve this, but to date Nissan remains unwilling to do anything about this. My truck still has both a basic and extended warranty (for whatever that is worth). Nissan wants me to continue driving it to see if it becomes worse (or dies).

Sorry about the length of this post...but just wanted to share my situation
 

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Amazing they don't agree with their own trained techs! The warranty dept. is filled with bean counters in suits. At least the dealer service dept has it on record and believes there IS an issue.
I'm sure you will prevail in this so be a thorn in their side. Good luck.

Clint
 

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I'm no technician, but you might try this. Quickly turn the key on and off so as to spin the engine, but not start it (perhaps doing this twice), THEN proceed with a regular start. Does it still make the noise upon startup?

If there's no noise, the secondary timing chain tensioners are likely the culprit because spinning the engine has pressurized the oil system and the tensioners have lifted, thus tensioining the chains.

If there's still a loud noise, piston slap might indeed be the cause.

I'll bet others might have better ideas.
 

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Get it in documentation that the techs said to replace it. Also, get a second and third option in documentation. When you get those opinions, do NOT tell them what another mechanic has said, just act like they're the first.

This will ensure you get three unbiased opinions and if things reach courtside and which it probably will, you will have what you need to ensure a quick win.

I had an 06 scion tC which had bad bearings and threw two rods. Before it did such, there was a heavy bottom end rattle that persisted for about 8k miles (started at about 22k miles and threw rods right after 30k). It coldstarted so hard that it felt like the engine was choking, but in reality those bearings were seizing every night they sat. Dealer had earlier heard the rattle and in this case said it was normal. However I got three other opinions from independent specialist who all stated the bottom end had abnormal noise and recommended a teardown to inspect the crankshaft, rods, bearings, etc.

When engine blew, scion said it was from non-spec oil being used (I had documentation of mobile 1 synthetic change every 5k miles from oil receipts and oil waste logs).

Went to court with toyota/scion and with three independent opinions, it took a few hours and I walked away with an award to get a new engine and labor from any place I chose.
 

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I have the noise on start-up, but it is not there after warm-up. Seem to remember this posted a few years ago and someone had found a fix. It wasn't related to timing chain or piston slap, nor was it detrimental to life of engine. Searching that far back is not easy!
 

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I remember the same thing jstpsgthruyrwrld. I think the member said his wife's Altima (with a VQ) did the same thing, yet ran fine for a long, long tiime.
 
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