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After engine wash w/water: Hesitation / Stumble on acceleration, MIL code is 18
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To Answerer No. 1: Yes, my vehicle DOES display trouble code 18: I checked with Alldata and Mitchell Automotive software (other person has this software). This is what the table of trouble codes states: The table lists various codes, including the codes 17 and 25, then it clearly states, in BOLD CAPITAL letters: "CODES NOT LISTED - PGC, See: Powertrain Management/ Computers and Control Systems/Testing and Inspection.../Pinpoint tests/PGC - Power and Ground Connections" So, it directs me to go through tests of Computer's power and ground connectors, and possibly inputs on computer from various sensors. I could go through all that, but I figured that experienced mechanic (not a dude from the street like the one who said "there is no code 18") would narrow down the tests for me based on his/her experience with these symptoms. Moreover, various online sites (just Google "ford trouble codes") give description of code 18 and three reasons for it.