Escort/Lynx fuel problem

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Use 87 Lynx, 1.9L as commuter car. Recently had bad idle problem. Replaced cap, rotor, plugs, fuel filter and O2 sensor. None of these helped. Had mechanic fix it and he changed the throttle body fuel injector. Now mpg has gone from 25+mpg to 15mpg. Pulled the O2 sensor out and the tip was black-all carboned up proving overly rich mixture. Pulled the vacuum hose off MAP and the idle went up a lot which tells me it's working. Vacuum at the MAP hose good. Took it back to the mechanic that changed the injector and he put it back on the computer and everything checks out. He swears that he's never seen a fuel injector cause bad mpg. Any ideas? Thanks

posted by  mistergm

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