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      03-27-2013, 09:18 PM   #95
RPM90
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Drives: 340i M-sport AT
Join Date: Mar 2006
Location: Chicago

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Quote:
Originally Posted by RollingLower42 View Post
I never have used E85, & I have only pumped 100 octane, but for whatever reason, when I put 100 octane in, my CEL comes on.

I did a couple of tests and didn't run the racing fuel for awhile, and only pumped 91, and eventually the light would turn off on its own.

Then I would pump 100 again, and boom, back on.

Not sure why the 100 octane makes my light come on, but it definitely does.
Sorry for the delayed post on this.
Just to be sure, did you make sure that the 100AKI fuel was lead free?

The station near me that sells race gas switched within the past year.
They now have 105 or 110, but it's leaded so NO GO with our modern engines.
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