Possible engine issue,need help to diagnose

pat_0701 · 01-30-2018, 07:01 PM

Hey guys,
I drive a 2010 G37s coupe 6mt, 64k miles on the odo.
Since I got my car fixed from an accident, it has been behaving weirdly.

Basically, whether I'm in 1st or 2nd gear and I'm accelerating quickly there is this unpleasant sound that erupts.(between 3.5-4.5k rpms) This does not happen in any other gear.
Sounds as if it is coming from my engine or maybe even my transmission. The sounds can be almost described as a finger rubbing on glass,
although much louder. This sound also happens when I am driving through rough roads in 1st or 2nd gear with a heavy foot.

I've been trying to pin point this noise but I have no luck. I've been searching forums everywhere, everyday. It's getting pretty frustrating. Any help or input would be highly appreciated. Thanks in advance!

https://youtu.be/_T7mC3i5xn8
P.S. I apologize if you cannot hear the sound well from my video, as I realized my phone did not pick up the sound loud enough.

pat_0701 · 02-01-2018, 02:24 PM

bump, anyone?

Chuck33079 · 02-01-2018, 02:27 PM

What happened to the car in the accident? What was damaged, and what was replaced?

pat_0701 · 02-01-2018, 02:35 PM

Quote:

Originally Posted by Chuck33079

What happened to the car in the accident? What was damaged, and what was replaced?

It was a drivers side front collision. The frame was a little bit bent but it was taken care of. The items replaced were : front bumper and assembly, headlights, fender, AC lines, and the intake airbox.

I've been getting told it might be my motor mounts but I do not notice the car drifting away when I accelerate and do not have my hands on the wheel.

Chuck33079 · 02-01-2018, 02:38 PM

If it didn't occur until after the repair from the accident, why not give the car back to the shop and tell them they missed something? Take them for a ride along and point out the noise.

pat_0701 · 02-01-2018, 02:44 PM

Quote:

Originally Posted by Chuck33079

If it didn't occur until after the repair from the accident, why not give the car back to the shop and tell them they missed something? Take them for a ride along and point out the noise.

Good suggestion, I did just that. I took the mechanic out on a spin and he looked under my car on a lift. He could not diagnose what was wrong. I'm hoping someone had this problem before that is why I took it to the forums. If all else fails, I'll take it to an Nissan/Infiniti dealer. I should clarify:the car behaved fine for the first week I got it back. But then it started to be strange. No power loss or anything, might be my suspension or hopefully my shift forks.

SouthArk370Z · 02-01-2018, 03:43 PM

First thing that comes to my mind is a bad drivetrain mount. I'd start at the engine and work back to the differential.

pat_0701 · 02-01-2018, 04:31 PM

Quote:

Originally Posted by SouthArk370Z

First thing that comes to my mind is a bad drivetrain mount. I'd start at the engine and work back to the differential.

Thanks for the reply. The drive train was the first thing checked out by the mechanic. He said nothing was loose under there.

Going back at what I said, this only happens 1st and 2nd gear. I tested 3rd and 4th gear under the same scenarios where the sound would erupt if I was in 1st or 2nd. No sound or anything, it was perfectly normal.

Rusty · 02-01-2018, 07:15 PM

What gear was the Z in when it got hit?

pat_0701 · 02-01-2018, 11:09 PM

Quote:

Originally Posted by Rusty

What gear was the Z in when it got hit?

I think it may have been 2nd or 3rd gear, I can't remember exactly but for sure one of those 2.

Rusty · 02-02-2018, 03:06 AM

Quote:

Originally Posted by pat_0701

I think it may have been 2nd or 3rd gear, I can't remember exactly but for sure one of those 2.

Sounds like maybe a tranny problem. During impacts, sometimes the tranny gets it too.

pat_0701 · 02-02-2018, 11:54 AM

Quote:

Originally Posted by Rusty

Sounds like maybe a tranny problem. During impacts, sometimes the tranny gets it too.

Thanks for the input! I'm going to have the tranny inspected when the time comes to replace my clutch and flywheel. Hoping I don't have to replace the whole trans...

Chuck33079 · 02-02-2018, 11:56 AM

You might need to get it inspected now, before it potentially eats itself. Waiting might not be the best idea.

pat_0701 · 02-02-2018, 12:00 PM

Quote:

Originally Posted by Chuck33079

You might need to get it inspected now, before it potentially eats itself. Waiting might not be the best idea.

If I go light on the pedal in 1st or 2nd gear it does not make the noise. The noise happens on WOT. But you're right, it may be safer to get it inspected soon.

Chuck33079 · 02-02-2018, 12:06 PM

Well, whatever is causing the noise may very well be happening at light throttle, just not in an audible amount. If it were my car, I'd park the thing until I got a clean bill of health.

01-30-2018, 07:01 PM	#1 (permalink)
pat_0701 Base Member Join Date: Dec 2017 Location: Illinois Posts: 10 Drives: 2010 G37s Coupe 6mt Rep Power: 8	Possible engine issue,need help to diagnose Hey guys, I drive a 2010 G37s coupe 6mt, 64k miles on the odo. Since I got my car fixed from an accident, it has been behaving weirdly. Basically, whether I'm in 1st or 2nd gear and I'm accelerating quickly there is this unpleasant sound that erupts.(between 3.5-4.5k rpms) This does not happen in any other gear. Sounds as if it is coming from my engine or maybe even my transmission. The sounds can be almost described as a finger rubbing on glass, although much louder. This sound also happens when I am driving through rough roads in 1st or 2nd gear with a heavy foot. I've been trying to pin point this noise but I have no luck. I've been searching forums everywhere, everyday. It's getting pretty frustrating. Any help or input would be highly appreciated. Thanks in advance! https://youtu.be/_T7mC3i5xn8 P.S. I apologize if you cannot hear the sound well from my video, as I realized my phone did not pick up the sound loud enough.

02-01-2018, 02:27 PM	#3 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	What happened to the car in the accident? What was damaged, and what was replaced? __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

02-01-2018, 02:38 PM	#5 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	If it didn't occur until after the repair from the accident, why not give the car back to the shop and tell them they missed something? Take them for a ride along and point out the noise. Rusty likes this. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

02-01-2018, 03:43 PM	#7 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324198	First thing that comes to my mind is a bad drivetrain mount. I'd start at the engine and work back to the differential. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

02-01-2018, 07:15 PM	#9 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 69 Posts: 35,384 Drives: 2011 Nismo GM 6M Rep Power: 2684438	What gear was the Z in when it got hit? __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

02-01-2018, 02:24 PM	#2 (permalink)
pat_0701 Base Member Join Date: Dec 2017 Location: Illinois Posts: 10 Drives: 2010 G37s Coupe 6mt Rep Power: 8	bump, anyone?

02-02-2018, 11:56 AM	#13 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	You might need to get it inspected now, before it potentially eats itself. Waiting might not be the best idea. SouthArk370Z and Rusty like this. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

02-02-2018, 12:06 PM	#15 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	Well, whatever is causing the noise may very well be happening at light throttle, just not in an audible amount. If it were my car, I'd park the thing until I got a clean bill of health. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

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