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


Registered: 05/16/11
Posts: 846
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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2013 Hyundai Elantra Gt Hatch 6 spd
2008 Nissan Sentra
1997 HD Sportster

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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: 846
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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2013 Hyundai Elantra Gt Hatch 6 spd
2008 Nissan Sentra
1997 HD Sportster

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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: 846
Loc: Chicago
Oil level is normal.
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2013 Hyundai Elantra Gt Hatch 6 spd
2008 Nissan Sentra
1997 HD Sportster

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


Registered: 11/06/09
Posts: 1248
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: 216
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: 1528
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: 4488
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: 846
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.
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2013 Hyundai Elantra Gt Hatch 6 spd
2008 Nissan Sentra
1997 HD Sportster

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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: 846
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"
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2013 Hyundai Elantra Gt Hatch 6 spd
2008 Nissan Sentra
1997 HD Sportster

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


Registered: 03/21/04
Posts: 16081
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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2015 Subaru Forester 2.5 engine/CVT PP & M1
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1999 Dodge Ram 2500 w/Cummins - Rotella T6 & M1


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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: 1067
Loc: Lakeside, CA
Heat shield on the muffler has come loose.
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99 Jeep GC 4.7 146,000 PYB 5w30, Fram Ultra.

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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: 3824
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: 846
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
2008 Nissan Sentra
1997 HD Sportster

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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: 9777
Loc: Saskatoon canada
Originally Posted By: Warstud
Broken exhaust hangar or loose heat shield



That'll be my guess too
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2006 Charger RT
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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: 1067
Loc: Lakeside, 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 Jeep GC 4.7 146,000 PYB 5w30, Fram Ultra.

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