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Old 03-11-2018, 04:14 PM   #1
S-Tecnica-I
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Vehicle:
2015 WRX STI

Default Overwhelming Exhaust like smell in Cabin

Everyone, I am beyond baffled! I cannot locate where this smell is coming from and/or why. At this point I can only assume it is coming in only when the window(s) are down. Even if only cracked opened a couple of inches its immediate!! Highway, cruising, stop light... doesn't matter. It only gets worse if you push the car. If you leave windows up and open the door, it hits you like a wall. So bad you smell like it when you get out of the car. It has to be a fixable issue. PLEASE somebody help!!

I checked exhaust under car... all seems tight
I extended the competition IAG AOS vent hose farther back under the car(the smell is similar to that)

Here is the list of go fast goodies:

Shortblock 8.2:1 2.5L
Cosworth piston set
OEM crankshaft
RalliSpec, Ltd. HP connecting rod set
King Racing bearing set
Subaru MY2008+ STI Oil Pump, 11mm Pump Rotor
ARP Head Stud Kit ARP2000
Engine Gasket Kit EJ257 MY08+
Gates Timing Belt & Water Pump Kit With Racing Belt, MY05+
Machining - deck cylinder heads
Mishimoto Subaru STI Thermostatic Oil Cooler Kit
IAG Performance Competition Air / Oil Separator (AOS)
Killer B Ultimate Oil Pickup EJ25 Turbo
Subaru WRX/STi Dominator 1.5XT-R Ball Bearing Turbocharger
Tomei EXHAUST MANIFOLD for EJ25 Equal-Length
Cobb SUBARU TOP FEED 1050X FUEL INJECTORS
SUBARU AEM HIGH FLOW FUEL PUMP
COBB Subaru 4 Bar MAP Sensor
Lower Manifold (TGV Delete Housing) EJ207 Spec C (Top Feed)
Exedy Stage 1 Clutch Kit Heavy Duty (Max 590 ft-lbs) STI 6MT
CattedGrimmspeed DP w/divorced wastegate
ETS Cat-Back
ProcessWest Top Mount
COBB EBCS
PST Carbon Fibor Driveshaft
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Old 03-11-2018, 09:32 PM   #2
S-Tecnica-I
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Default

Let me apologize ahead of time if this is not posted in the right spot.
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Old 03-11-2018, 11:44 PM   #3
viper_crazy
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Spark Silver

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Sounds like an exhaust leak somewhere you can't see. Would have to smoke it to find it if there is one. If you're cheap and resourceful, you can YouTube search "DIY exhaust smoke test" to make an at home version. Just get your car on ramps or stands so you can crawl under and check everything.
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Old 03-16-2018, 09:47 AM   #4
kellygnsd
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LINK G4+ hybrid STi

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It's either from the turbo to DP flange or the DP to catback flange. Leaks elsewhere don't fill the cabin with exhaust fumes like that. Look harder.
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Old 03-16-2018, 10:53 AM   #5
86Dreams
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If theres not an exhaust leak this might be something else to check. Inside of the trunk on either side are these little vents with rubber flaps that act like check valves. These are intended to equalize the pressure inside the cabin with the outside world when you close the doors. If one of them is messed up or defective it can cause what your describing(happened to me). The vents are behind the trunk lining. I was able to cover mine up with metal tape (for like ducts and stuff) and that mostly fixed it for me.

Its easy to check so why not?
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Old 03-16-2018, 12:00 PM   #6
undyjr
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Quote:
Originally Posted by 86Dreams View Post
If theres not an exhaust leak this might be something else to check. Inside of the trunk on either side are these little vents with rubber flaps that act like check valves. These are intended to equalize the pressure inside the cabin with the outside world when you close the doors. If one of them is messed up or defective it can cause what your describing(happened to me). The vents are behind the trunk lining. I was able to cover mine up with metal tape (for like ducts and stuff) and that mostly fixed it for me.

Its easy to check so why not?
Hell, you've got me sold. Even cracking the windows will create a negative pressure in the car. I could see exhaust fumes being pulled in through a damaged flap in the trunk.
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Old 03-16-2018, 04:08 PM   #7
S-Tecnica-I
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I love you guys for responding with ideas!!

I am so desperate I'll look anywhere. I have been trying to schedule a smoke test. But as mentioned above, I keep thinking it is a leak near the turbo. I can literally produce the smell. I say this because when I first get in the car and if I just drive VERY casually, almost no smell, regardless of speed. But if I get into boost, its almost instant! I can't help thinking that whatever it is, when it gets hot, it's expanding allowing the gases to escape. People have stood next to the car when I'm just chillin and they instantly tell me the car stinks! So sad...
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Old 03-22-2018, 06:19 PM   #8
scarzhero
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2002 Wrx sti swap
grey

Default Me too

I have a similar issue, everything is fine until I open the window. Smells like gas/exhaust. it smells different then a gas can though. No leaks I can see so far. It's getting nice out can only drive with the windows up for so long.
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Old 04-06-2018, 11:51 PM   #9
Wolfboy
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Check exhaust leaks probably near catback to downpipe or downpipe to turbo connection. Is it tuned?
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Old 04-07-2018, 11:47 PM   #10
S-Tecnica-I
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Well I am told that it is either the AOS venting to atmosphere or normal exhaust smell... products of a car built like this.

Neither of which I understand especially on the highway. I don't see how it is possible that any of that can cause that smell to come back in the car at 70+mph!

I don't what to do.
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Old 04-08-2018, 07:14 PM   #11
S-Tecnica-I
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I THINK I GOT IT!!

So I saw a video and I believe it was mentioned previously in this thread... I didn't think it was possible to have that much stank in the car and I NEARLY ignored it... but... the vents in the rear of the car behind the trunk liner. Sure enough, one was stuck open! Fixed it, took it out, cruised, then drove it real hard a few times and nearly no smell!!! I think the only smell was the interior from the everyday problem. I hope tomorrow is the same results.

Thanks to all that have posted!
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Old 04-10-2018, 02:18 PM   #12
S-Tecnica-I
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86Dreams GOOD CALL bro!! I wanted to make sure I acknowledged that!
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Old 04-16-2019, 09:13 PM   #13
Cloud17
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Quote:
Originally Posted by S-Tecnica-I View Post
I THINK I GOT IT!!

So I saw a video and I believe it was mentioned previously in this thread... I didn't think it was possible to have that much stank in the car and I NEARLY ignored it... but... the vents in the rear of the car behind the trunk liner. Sure enough, one was stuck open! Fixed it, took it out, cruised, then drove it real hard a few times and nearly no smell!!! I think the only smell was the interior from the everyday problem. I hope tomorrow is the same results.

Thanks to all that have posted!
I have a flap open as well on my 2018 WRX. Noticed the smell instantly today the first time I really let it rip. Almost have 12,000 miles on it... I nearly passed out from the fumes. It is unbelievable this is still an issue on a 2018. What are they trying to kill us? Thanks for this thread boys !
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Old 08-01-2019, 04:22 PM   #14
Treslocos
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Quote:
Originally Posted by S-Tecnica-I View Post
Everyone, I am beyond baffled! I cannot locate where this smell is coming from and/or why. At this point I can only assume it is coming in only when the window(s) are down. Even if only cracked opened a couple of inches its immediate!! Highway, cruising, stop light... doesn't matter. It only gets worse if you push the car. If you leave windows up and open the door, it hits you like a wall. So bad you smell like it when you get out of the car. It has to be a fixable issue. PLEASE somebody help!!

I checked exhaust under car... all seems tight
I extended the competition IAG AOS vent hose farther back under the car(the smell is similar to that)

Here is the list of go fast goodies:

Shortblock 8.2:1 2.5L
Cosworth piston set
OEM crankshaft
RalliSpec, Ltd. HP connecting rod set
King Racing bearing set
Subaru MY2008+ STI Oil Pump, 11mm Pump Rotor
ARP Head Stud Kit ARP2000
Engine Gasket Kit EJ257 MY08+
Gates Timing Belt & Water Pump Kit With Racing Belt, MY05+
Machining - deck cylinder heads
Mishimoto Subaru STI Thermostatic Oil Cooler Kit
IAG Performance Competition Air / Oil Separator (AOS)
Killer B Ultimate Oil Pickup EJ25 Turbo
Subaru WRX/STi Dominator 1.5XT-R Ball Bearing Turbocharger
Tomei EXHAUST MANIFOLD for EJ25 Equal-Length
Cobb SUBARU TOP FEED 1050X FUEL INJECTORS
SUBARU AEM HIGH FLOW FUEL PUMP
COBB Subaru 4 Bar MAP Sensor
Lower Manifold (TGV Delete Housing) EJ207 Spec C (Top Feed)
Exedy Stage 1 Clutch Kit Heavy Duty (Max 590 ft-lbs) STI 6MT
CattedGrimmspeed DP w/divorced wastegate
ETS Cat-Back
ProcessWest Top Mount
COBB EBCS
PST Carbon Fibor Driveshaft
Thanks for this post. Had my car in the body shop, they took out both vent assemblies while they were painting and reinstalled them both upside down. Taped those bastards off for now!
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