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  #1  
Old 06-10-2014, 08:19 PM
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2012 35i-carbon from left exhaust

New to me 2012 Certified X5 35i with 30 K miles. Car is white so the black carbon coming from left exhaust is conspicuous.(dealer says there is a baffle so most exhaust comes out the left until at high power). too few miles to tell if engine is using oil.

I find myself having to wash the white cowling under the tip of the left exhaust and the rim of the chrome tip every 50 miles.

Anybody else seeing this? Maybe I should have bought a black car.

I'm going on a 2,000 mile trip through Nevada soon and will have an opportunity to run 80 mph or so for hours at a time. maybe this will help.

this 8 speed transmission is programmed so that the car is at 1200 rpm on our local roads with 45 mph speed limit. 70 mph is only 1700 rpm so I will need to use manual selection to get the rev's up.

thanks for any insight

JimL
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Old 06-10-2014, 09:25 PM
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There is indeed a valve that keeps the passenger side closes below 3000rpm and under low throttle. Nothing suspect about it
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Old 06-10-2014, 10:41 PM
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Thanks, Jyohay. I'm not concerned about the valve. I'm concerned about the amount of carbon coming out and just asking if others are experiencing this.

JimL
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Old 06-10-2014, 11:07 PM
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I've noticed the black stuff around the left pipe on numerous white E70 35i Xs here in TX. Must be a common issue.
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Old 06-10-2014, 11:44 PM
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What are your fuel trims? Additive and multiplicative. If you are running rich you can get carbon specs.
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Old 06-11-2014, 03:41 PM
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I don't know my fuel trims. How do I find out?
JimL
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Old 06-11-2014, 03:43 PM
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Computer, handheld code reader..attached to OBDC connector under dash.
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Old 06-11-2014, 06:53 PM
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Turbo engines will run a bit rich under acceleration,so that is normal.I had a 12 50i a few months ago and it was getting a lot of black around and on the tips.That is not oil burning.
If there is even a slightest deviation in the mixture the CEL will light-up right away.
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