Cabin fumes

[nick9one1]

My honest opinion is that if you have fumes in the cabin the root cause is an exhaust leak somewhere underneath the car.

Occasionally I dont close the rear hatch properly, and in the rear view mirror I can see daylight between body and seal. I usually dont notice until I start driving and realise road noise is louder than usual. I've driven my 15 mile commute this way (slightly open hatch) numerous times, with and without the front windows/sunroof open. I never get any exhaust smell inside the car, even when not moving!

I also had my center console, gear gaiter and rubber seal out for a little while and never got fumes from the tunnel either.

So i think you need to be looking for an exhaust leak.
The other possibilty, like I mentioned before is a cracked/leaking manifold. Fumes escaping under the bonnet and being drawn in by the fans.

 

[Dunners]

ORIGINAL: nick9one1

My honest opinion is that if you have fumes in the cabin the root cause is an exhaust leak somewhere underneath the car.

Occasionally I dont close the rear hatch properly, and in the rear view mirror I can see daylight between body and seal. I usually dont notice until I start driving and realise road noise is louder than usual. I've driven my 15 mile commute this way (slightly open hatch) numerous times, with and without the front windows/sunroof open. I never get any exhaust smell inside the car, even when not moving!

I also had my center console, gear gaiter and rubber seal out for a little while and never got fumes from the tunnel either.

So i think you need to be looking for an exhaust leak.
The other possibilty, like I mentioned before is a cracked/leaking manifold. Fumes escaping under the bonnet and being drawn in by the fans.

I'll have another good look at the exhaust, but as stated, I made sure it was thoroughly checked out by both RPM and ProMax.

Nick, does your car have a bridge spoiler? I have a theory that the main cause for this problem with 944's is the older over hanging spoiler as I believe it creates more of a pocket when driving along.

Are there any people out there with bridge spoilers that have issues with fumes?


Drew

 

[nick9one1]

Yes it does have a bridge spoiler so your theory could be correct.

 

[david924s]

Both my old 924S and my 944S2 have the "old" rubber spoiler and neither got or get fumes into the car even when the hatch has opened while driving so I would suspect a leak in the exhaust maybe only noticeable when driivng as it is under load from the engine, stick your hand over the tailpipe when it is running for a few seconds and see if it blows anywhere.