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my fiance's 98 ford contour has a diagnostic code of 0171 (system (adaptive fuel) too lean bank 1), any ideas as to what i should be fixing? Is it a vaccum leak or the downstream oxygen sensor? the upstream oxygen sensor is new.
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down stream o2 will not set a
down stream o2 will not set a lean code, it only monitors cat. performance. vacuum leak very likely, but a bad map or maf will also cause code.
Any ideas on how i can find
Any ideas on how i can find the vaccum leak? Would the bad map or maf cause the car to idle rough and stall after 5 minutes?
you need to check the fuel
you need to check the fuel pressure when it's running rough. should be around 50 psi @ idle. next you'll need a scanner to monitor o2 sensor voltage. if the map or mass air flow readings are very low, that ind. a vacuum leak. let us know what you find so far.