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Old 06-10-2019, 03:59 AM   #1
drave199
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Default Exhaust smell

So I have had my 2007 wrx for about 3 months now and am definitely enjoying it. Itís my first Subaru and first manual car and getting better every day at driving it. I have many questions but Iíll ask them in moderation lol.

Since day one I have had an unusual exhaust smell that seems to come from under the car. I have gotten used to diesel exhaust the last 3 years so maybe itís normal. Itís not a rotten egg smell or anything, just a strong exhaust smell. It seems to come from directly under the car in the middle. I mostly notice it if I have the drivers window down and come to a stop, then I can smell it come in. Or when I pull into my garage I can definitely smell it. If the windows are up, no smell. It smells different than what comes out the tail pipe and does seem to not be as pronounced after a little bit of idling. Itís hard to say if itís more or less detectable after driving hard. Fwiw, it does have an intake, down pipe and accessport. Any ideas? Maybe this is better suited in a different section?

Thanks!
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Last edited by drave199; 06-10-2019 at 04:11 AM.
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Old 06-10-2019, 05:48 AM   #2
rtv900
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you have a leak
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Old 06-10-2019, 08:14 AM   #3
Charlie-III
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Could be an oil leak that drips on exhaust. Get the car up and look, common is from valve covers.
Exhaust leak, I like to get the car up, engine running, have someone block off exhaust exit with a rag while you feel around and listen for leaks.
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Old 06-10-2019, 08:16 AM   #4
Fndragn
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Is it a catless downpipe? You’ll smell a lot more exhaust if it’s catless. If it’s an actual leak you should be able to hear it sounding funny.
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Old 06-10-2019, 09:10 AM   #5
bdubblu
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So far your tests have been limited to smell. Next step is to actually look... get under it.
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Old 06-10-2019, 01:01 PM   #6
drave199
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Quote:
Originally Posted by Fndragn View Post
Is it a catless downpipe? Youíll smell a lot more exhaust if itís catless. If itís an actual leak you should be able to hear it sounding funny.
It is a Cobb catted dp. The only ďunusualĒ noise I hear is a slight ticking at lower rpms but from what I understand thatís a normal sound in these engines. Car only has 64k miles
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Old 06-10-2019, 01:23 PM   #7
rtv900
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I know one time in my car my oil fill cap came loose so I was driving for days without the cap on.
It reeked of a sort of fuel, oil, exhaust like smell only when I'd come to a stop.
but very strong in the cabin, totally sucked

Once I saw the fill cap was completely off and put it back on it went away.
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Old 06-10-2019, 02:57 PM   #8
drave199
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Quote:
Originally Posted by rtv900 View Post
I know one time in my car my oil fill cap came loose so I was driving for days without the cap on.
It reeked of a sort of fuel, oil, exhaust like smell only when I'd come to a stop.
but very strong in the cabin, totally sucked

Once I saw the fill cap was completely off and put it back on it went away.
Thanks Iíll check that. It doesnít come in the cab with the windows up though
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Old 06-11-2019, 01:21 AM   #9
noahp
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An easy check for an exhaust leak if you can't feel it with your hands is by spraying soapy water at each connection point. If there is a leak, the escaping air will form bubbles from the soapy water.
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Old 06-11-2019, 01:23 PM   #10
Fndragn
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Soapy water will only work for a few seconds on a cool exhaust. Once it gets warm it’ll just burn off.
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Old 06-11-2019, 05:22 PM   #11
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Quote:
Originally Posted by Charlie-III View Post
Could be an oil leak that drips on exhaust. Get the car up and look, common is from valve covers.
Exhaust leak, I like to get the car up, engine running, have someone block off exhaust exit with a rag while you feel around and listen for leaks.
If you're alone a giant potato up the tailpipe works just as well......
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Old 06-13-2019, 12:52 PM   #12
R1Armadillo
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Quote:
Originally Posted by Scorpius View Post
If you're alone a giant potato up the tailpipe works just as well......
Wait, I thought it was a banana?!! (Beverly Hills Cop anyone?)

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Old 06-17-2019, 12:55 PM   #13
Breydent
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sounds like you need a new exhaust
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Old 06-17-2019, 02:47 PM   #14
mcursch88
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just buy gaskets and replace them all.
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Old 08-01-2019, 03:19 PM   #15
Treslocos
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Quote:
Originally Posted by drave199 View Post
So I have had my 2007 wrx for about 3 months now and am definitely enjoying it. Itís my first Subaru and first manual car and getting better every day at driving it. I have many questions but Iíll ask them in moderation lol.

Since day one I have had an unusual exhaust smell that seems to come from under the car. I have gotten used to diesel exhaust the last 3 years so maybe itís normal. Itís not a rotten egg smell or anything, just a strong exhaust smell. It seems to come from directly under the car in the middle. I mostly notice it if I have the drivers window down and come to a stop, then I can smell it come in. Or when I pull into my garage I can definitely smell it. If the windows are up, no smell. It smells different than what comes out the tail pipe and does seem to not be as pronounced after a little bit of idling. Itís hard to say if itís more or less detectable after driving hard. Fwiw, it does have an intake, down pipe and accessport. Any ideas? Maybe this is better suited in a different section?

Thanks!
So there's another post about this, I'd link it but I'm too lazy. I had the same problem, it was the vents behind the rear bumper cover. They can be accessed in the trunk, behind the carpet on the sides. Youtube it
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Old 08-02-2019, 11:02 AM   #16
bdubblu
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For the love of Samuel L Jackson.... get under the freaking car and put your hand next to every joint. If you canít find it by sight and sound.. which is usually pretty easy, then you can feel the hot air coming out of the joint. This should have been done by now.
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Old 08-07-2019, 09:51 AM   #17
86Dreams
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In your trunk on either side behind the wheel wells and behind the lining are two vents. they are one way check valves that open to relieve cabin pressure when you close the doors. They have a flap of flimsey rubber that acts as the valve mechanism. If either of them rip or stick open then you will get an exhaust smell in the cabin with the windows open.
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Old 08-11-2019, 04:56 PM   #18
drave199
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Apparently this was resurrected. But as an update, I still havenít found what the cause is, if there is a cause. Trunk vents are good, didnít find an obvious leak in the exhaust. Still happens even after adding the cat back exhaust(now have a full tbe). Windows up, no smell. Windows down, come right in on my face. I will keep investigating. Thanks for the help thus far
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Old 08-12-2019, 10:50 PM   #19
Riptyde
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This is totally not a DIY but you could take it to your local reputable exhaust shop and just have them diagnose it. They'd probably do it for free. Can't beat a lift.
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Old 08-14-2019, 09:57 AM   #20
BooostedNooob
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+1 for being catless?
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Old 08-15-2019, 02:15 AM   #21
drave199
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Quote:
Originally Posted by Riptyde View Post
This is totally not a DIY but you could take it to your local reputable exhaust shop and just have them diagnose it. They'd probably do it for free. Can't beat a lift.


Probably will, I was an idiot for not having them look at it when they put the exhaust in last month but I was to excited. I have an oil change coming up so Iíll have them look at it then for sure
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Old 08-15-2019, 02:15 AM   #22
drave199
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+1 for being catless?


Full tbe but it is a catted Cobb DP. High flow cat but still catted
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