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Old 01-23-2012, 11:52 AM   #1 (permalink)
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Question Engine noise

After driving for a while, noticed this noise. Is it normal?
2011 G37xs 3000 miles. thanks
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Old 01-23-2012, 07:14 PM   #2 (permalink)
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Take it to the dealer and have them check it out under warranty.
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Old 01-24-2012, 11:30 AM   #3 (permalink)
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I may be way off base but my former Nissan Murano that had a VQ engine had this rata-tap-tap sound. Turned out to be a fuel Damper gone bad.
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Old 01-24-2012, 07:58 PM   #4 (permalink)
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I can't reproduce the noise when cold start, then rev to 3000 rpm a few times. The noise only happens after driving for a while.
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Old 01-25-2012, 10:06 AM   #5 (permalink)
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On my VQ in the Murano, it only was noticed at idle on a warm engine.
I could hear nothing at speed but when at idle, it was very noticeable in the cab. Constant tapping like an old worn out Chevy pick up.

The culprit was the damper which looked like a small brass colored cylinder.
Probably 3 or 4 times the size of a sewing thimble. It was way back near the firewall and it was shot. The Nissan tech was a smart dude, had a metal stethoscope and put it on the damper and had me listen. Sure enough, loud tap sounds from it. Not saying it is what you have but something to look at if it produces this tap-tap sounds at idle on a warm engine.
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Old 01-25-2012, 10:49 AM   #6 (permalink)
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Quote:
Originally Posted by bob1 View Post
On my VQ in the Murano, it only was noticed at idle on a warm engine.
I could hear nothing at speed but when at idle, it was very noticeable in the cab. Constant tapping like an old worn out Chevy pick up.

The culprit was the damper which looked like a small brass colored cylinder.
Probably 3 or 4 times the size of a sewing thimble. It was way back near the firewall and it was shot. The Nissan tech was a smart dude, had a metal stethoscope and put it on the damper and had me listen. Sure enough, loud tap sounds from it. Not saying it is what you have but something to look at if it produces this tap-tap sounds at idle on a warm engine.
Greatly appreciated. I can't hear anything in the cab during driving or at idle. It is just after pop up the hood, i can hear it. Also, with cold start, then rev to 3000 after reach operating temp can't produce that noise. It is only after driving for a while. Stethoscope, that's a good idea. Hope the tech at the dealer is smart and experienced.
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Old 02-05-2012, 08:36 PM   #7 (permalink)
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UPDATE:
After driving for a while to reproduce the noise which can only be heard at idle, I restart the engine, the noise is gone. Someone said it was VVEL knocking, there is a TSB for it to update ECU/ECM, but that was for 2008 model. Mine is 2011 with 3000 miles
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Old 02-05-2012, 09:00 PM   #8 (permalink)
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keep an ear out for it and let the dealer know if it happens again.
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Old 03-26-2012, 12:23 PM   #9 (permalink)
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Any feedback from the dealer since your car is still under warranty?



Quote:
Originally Posted by mad_g37 View Post
After driving for a while, noticed this noise. Is it normal?
2011 G37xs 3000 miles. thanks
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