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#3211617 - 12/09/13 07:11 PM Help me diagnosis this issue!
dja4260 Offline


Registered: 05/16/11
Posts: 648
Loc: Chicago
My wife is having issues with her 2008 Nissan Sentra 2.5 w/ CVT.

It recently became very cold where we live. This is what she described to me over the phone.

When car is cold (temp) or under acceleration the car makes a VERY loud rumbling sound. She compared it similar to the sound that my Harley makes with it's open pipes. She said it's not a grinding noise. No check engine light is on.

My guess is that it's a cracked exhaust manifold?
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#3211627 - 12/09/13 07:21 PM Re: Help me diagnosis this issue! [Re: dja4260]
dja4260 Offline


Registered: 05/16/11
Posts: 648
Loc: Chicago
The first thing she is doing is checking the oil level. I always do it but since I've been gone for 6 months, she paid a local place to change it last week.
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#3211635 - 12/09/13 07:31 PM Re: Help me diagnosis this issue! [Re: dja4260]
dja4260 Offline


Registered: 05/16/11
Posts: 648
Loc: Chicago
Oil level is normal.
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97 Sportster- Amsoil
Sub 8 sec. 1/4 drag boat
622ci BBC- M1,Amsoil,Rotella

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#3211642 - 12/09/13 07:41 PM Re: Help me diagnosis this issue! [Re: dja4260]
cjcride Offline


Registered: 11/06/09
Posts: 711
Loc: Ontario Canada
Exhaust manifold crack.
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#3211657 - 12/09/13 07:55 PM Re: Help me diagnosis this issue! [Re: dja4260]
stroked93 Offline


Registered: 09/24/06
Posts: 192
Loc: midwest
Is this your first winter in the car? Nissan 4cyl are very unrefined and loud in cold temps, I have a couple and love them but they are loud cold.

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#3211659 - 12/09/13 07:58 PM Re: Help me diagnosis this issue! [Re: dja4260]
renegade_987 Offline


Registered: 04/07/11
Posts: 1470
Loc: Ankeny, IA
I'd vote for a cracked exhaust manifold
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#3211668 - 12/09/13 08:10 PM Re: Help me diagnosis this issue! [Re: dja4260]
The_Eric Offline


Registered: 03/31/10
Posts: 3524
Loc: Iowa
Have her wait till the car is cold again, then open the hood. Start the car and see if see can isolate the noise to an area. She doesn't really have to know what it is, but if she can give you/us an idea of where it's at, and if it gets worse when revving or not, that would help.
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#3211669 - 12/09/13 08:11 PM Re: Help me diagnosis this issue! [Re: stroked93]
dja4260 Offline


Registered: 05/16/11
Posts: 648
Loc: Chicago
Originally Posted By: stroked93
Is this your first winter in the car? Nissan 4cyl are very unrefined and loud in cold temps, I have a couple and love them but they are loud cold.


No, she purchased this car new in 08. We've pin pointed the noise now to the rear of the car. Exhaust gasket or muffler is my guess.

Trust me, the lack of detail is frustrating....

Sounds like it's safe to continue driving until my father can take a look later this week.
_________________________
2013 Hyundai Elantra Gt Hatch 6 spd
97 Sportster- Amsoil
Sub 8 sec. 1/4 drag boat
622ci BBC- M1,Amsoil,Rotella

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#3211671 - 12/09/13 08:12 PM Re: Help me diagnosis this issue! [Re: The_Eric]
dja4260 Offline


Registered: 05/16/11
Posts: 648
Loc: Chicago
Originally Posted By: The_Eric
Have her wait till the car is cold again, then open the hood. Start the car and see if see can isolate the noise to an area. She doesn't really have to know what it is, but if she can give you/us an idea of where it's at, and if it gets worse when revving or not, that would help.


I've tried. Don't get me started. As described "it's louder the more I push the gas pedal down"
_________________________
2013 Hyundai Elantra Gt Hatch 6 spd
97 Sportster- Amsoil
Sub 8 sec. 1/4 drag boat
622ci BBC- M1,Amsoil,Rotella

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#3211675 - 12/09/13 08:13 PM Re: Help me diagnosis this issue! [Re: dja4260]
Donald Offline


Registered: 03/21/04
Posts: 13760
Loc: Upstate NY
If it get quieter when the engine warms up then it might be a cracked exhaust manifold.

I had one on my Camry probably for 50K miles. Sold it like that.
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#3211711 - 12/09/13 08:56 PM Re: Help me diagnosis this issue! [Re: dja4260]
Blkstanger Offline


Registered: 08/13/11
Posts: 684
Loc: San Diego CA
Heat shield on the muffler has come loose.
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#3211713 - 12/09/13 08:57 PM Re: Help me diagnosis this issue! [Re: dja4260]
Warstud Offline


Registered: 09/02/05
Posts: 2966
Loc: MIchigan
Broken exhaust hangar or loose heat shield

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#3211745 - 12/09/13 09:31 PM Re: Help me diagnosis this issue! [Re: Warstud]
dja4260 Offline


Registered: 05/16/11
Posts: 648
Loc: Chicago
Originally Posted By: Warstud
Broken exhaust hangar or loose heat shield


I don't see a broken exhaust hanger making it sound like it has straight pipes.
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2013 Hyundai Elantra Gt Hatch 6 spd
97 Sportster- Amsoil
Sub 8 sec. 1/4 drag boat
622ci BBC- M1,Amsoil,Rotella

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#3211746 - 12/09/13 09:36 PM Re: Help me diagnosis this issue! [Re: Warstud]
Clevy Offline


Registered: 11/11/10
Posts: 7900
Loc: Saskatoon canada
Originally Posted By: Warstud
Broken exhaust hangar or loose heat shield



That'll be my guess too
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#3212883 - 12/10/13 09:33 PM Re: Help me diagnosis this issue! [Re: dja4260]
Blkstanger Offline


Registered: 08/13/11
Posts: 684
Loc: San Diego CA
The heat shield on my Daughters Nissan came loose. It made a [censored] of a noise. It was only held on by some cheesy little studs with push on spring things. Very cheap stuff.
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99 Ranger Supercab 4x4 4.0 150,000
QS Defy 10w30 Motorcraft FL-1A

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