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So far so good. Drove it another 2 hours and no more p228C engine code.
This makes me wonder if there's a bit of water in the tank as I have worked on the fuel system several times and left the low pressure fuel line open for days at a time.
Added a bottle of Iso-Heet and topped off the tank with top tier premium gas from Shell to get some good detergents running through the fuel system to clean it up.
Going to run this tank then fill it back up with E85 and see if that stops the p228c code.
It was coming on every 5 min and now it doesn't come on at all. I'll report back for others to use as a reference if they get this issue with E85. As I said, I've run it for years with no issues up until recently. Of note, it's winter here in Denver and I park it in a garage.
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2015 LFX M6 LS:Rotofab intake,Vmax ported throttle body,Jacfab laminator FX,extendolator,ARH HFC downpipes,Magnaflow resonated X pipe,SLP LM2 catback,Solo J pipes,Overkill Flexfuel sensor,E85 tune,3.91 gears,Monster twin disc clutch,Michelin PS4S tires,FR ZL1 wheels,SS brembos,BP drilled and slotted rotors,HPS 5.0 pads,RST SS brake lines,BMR rear trailing arms,Hendrix solid rear cradle bushings,1" drop Hotchkis lowering springs,1LE struts and sway bars,oem strut tower bar,Pedders radius rod bushing insert and rear trailing arm bushings,Z28 upper control arm bushings
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