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Message: <blockquote data-quote="speedracer" data-source="post: 27673" data-attributes="member: 15025">Thanks for responding. I was INCORRECT as i quoted a P0171 it was P0172 which is fuel rich. There is nosensor on this series it is determined by a Rube Goldberg algorithm. How nice an simple it would have been to justplace a toggle switch on the engine ECM - Left E10  Right E85. Could be changed on the fly depending on which gaswas available where you happened to be. Logical and easy = Can't be done!</blockquote>