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Old 08-13-2019, 10:16 AM
Zooks527's Avatar
Zooks527 Zooks527 is offline
Breaking in the Pony
Location: Mansfield, MA
 
Join Date: Mar 2009
Posts: 6,180
Mein Auto: 19 Mustang GT / 05 Tacoma
Brown smoke?

Sure, it's a Honda not an E90 BMW, but I'll plead general older car knowledge instead of OT, assuming the forum is no longer as strongly moderated in the past and hoping I've got a bit of latitude from post count.

Saw this on the highway this morning. I had been behind this guy for several miles, with not a sign of an issue. The car in front of me started to accelerate, kicked out a short burst of brown smoke after a few seconds, then slowed down and pulled over to the breakdown lane. He was coming off speed pretty quickly as he moved over (my speed is shown in the bottom center of the image).

I know what black, blue, and white smoke out the exhaust mean, but I haven't seen brown before, especially in a single short burst. Any ideas on the possible cause?

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Prior 44 years of cars: 1967 BelAir wagon / 1968 LeMans Tempest / 1970 Mustang Mach 1 / 1972 El Dorado / 1978 Corvette / 1981 Subaru GL wagon 4WD / 1983 s10 Blazer 4x4 / 1985 Bronco 4x4 / 1996 Bronco 4x4 / 2004 Passat 4motion / 2009 BMW 335i xDrive E92 / 2015 BMW M235xi xDrive F22

Last edited by Zooks527; 08-13-2019 at 10:18 AM.
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