Knocking noise and stalling

SouthArk370Z

Get a piece of garden hose about 4-10 feet long. Start engine. Place one end of the hose to your ear. Move the other end of the hose around until you can pinpoint the source of the noise. May have to lay on ground to check underneath. If you check under the hood, be very careful of moving parts.

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James512

Right, but then what? I'm not taking the car apart when it is under two different warranties. I was just trying to get some ideas from people who are more mechanically inclined than I am so i can take some ideas back to the dealership.

Another issue is that when the car warms up, upon take off, it jerks a little like someone learning to drive a manual. Nowhere near as bad bud definitely surge, normal, surge, normal, surge, normal.

cv129

I think SouthArk is quite mechanically inclined But it's hard to diagnose off just idling sound taken from a standing position.

If possible, put the car on jack stand, remove the undershroud, then do as SouthArk described. That'll give the seasoned Z guys here a much stronger idea for an internet diagnosis.

If 3x visits to dealership isn't getting this done, it's time roll up the sleeves and dig deeper.

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Setrab | RE-71 | SPL | JRZ | Nismo | ARK | Whiteline | RacingBrake | CJM Oil Pan | Ti shield

James512

Right on, this will be done tonight. More to come.

James512

It's back at the dealer. Finally got them to say that it sounds like it's the transmission, now they just have to prove it to Nissan.

cv129

Lol so they still can’t/won’t take necessary actions to pinpoint where the sound is coming from, let alone an acute diagnosis, the dealership just wants Nissan to cover a new tranny hoping the problem would be fixed....wow

Best of luck and keep us posted. The 7at and VQ37 are common within the Infiniti lineup, but no Nissan. I wonder if an Infiniti dealership would take a crack at a diagnosis for a fee.

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Setrab | RE-71 | SPL | JRZ | Nismo | ARK | Whiteline | RacingBrake | CJM Oil Pan | Ti shield

James512

Thanks but I wouldn't necessarily say that. Based on the videos, the stalling, and the other problems I've written in this post, the service manager and one of his employees say that it sounds like the problem is coming from the transmission and I told them that I agreed.

The last time the car was at the dealer, they did an air idle relearn (maybe it's called something different but its 7am and I cant think of it) and did the bulletin for the rear axles clicking. The last guy i dealt with said numerous times that the sound i was hearing sounded like it was coming from the rear of the vehicle and i told him that i did not agree, he even wrote that in the service order.

This time, the service staff said what I am experiencing sounds like a transmission issue, that's all I'm saying. This was never a loose axle issue but I did let them perform the bulletin because I'm sure those axles needed some grease by now.

Now it is up to a mechanic, hopefully with some direction from the service manager, to take a better look at the transmission and if it's not that to figure it out.

I'll keep yall posted.

SouthArk370Z

Once you have identified where the noise is coming from (engine, xmission, differential, etc), those who are more mechanically inclined may be able to provide some help. At this point, everyone is pretty much just shooting in the dark.

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Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma