I have an 84 300SD with 79,840 miles, and I am getting exhaust gas in the cabin if any window is down or the sunroof is open while driving along at any speed between 20 mph to 90 mph.

Also at at a stop with any window down I get exaust smell in the car. The smell is burnt exhaust not raw fuel.

However, stopped with windows up or moving along with the fan on I dont get any offensive smell. I also is is leaving soot circles al over the car.

The GF is fetting very tired of this, always wants to drive the blue 300D

or her car now******must fix even at Midas !!!!!
Any suggesstions where to start looking for a leak?? And how to repair!!!!

Thanks in advance for you assisstance. Steve

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Steve
1984 300SD
1987 300E
2000 Harley Road King
2006 Honda Accord EXL
1971 Chevrolet C-10 Pickup

Start at the exhaust manifold with the engine running and work your way back towards the tailpipe. Look for soot and feel for puffs of exhaust (don't touch the exhaust system though!

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

1984 300d Turbo 143,000
The 6 Inch Water Drains 2 Ea On Fire Wall Engine May Be Slip Off
And Reinstall After Oil Filter Change, Pull BacK Seat And Check
For Soot Marks Their Is 2, 3 In Covers May Be Missing When Some One Change The Rear Shocks Rear Ext System Holes Replace All 2 Piece Ext Systerm, Diy, And Flex Down Pipe Use Two Floor Jacks
To Hold Up Ext System 2 Bolts 4 Rear Rubber Donuts One Clamp