Question about 1998 Mercury Sable

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ENGINE CODES; NO ACCELERATION

I got 5 different codes when i went to autozone can someone tell me what they mean. PO761, PO171, PO172, PO174, PO175. ALSO SOMETIMES WHEN I AM DRIVING MY CAR WILL NOT PICK UP SPEED NO MATTER HOW MUCH I PRESS ON THE GAS PEDAL, IT WILL DO FINE FOR A WHILE WHEN I TURN IT OFF AND LET IT SIT FOR A FEW MINUTES THEN START IT BACK UP.

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Well this one will be a tough one.
P0761 is shift solenoid 3 malfunction. Most likely caused by a broken valve retainer in the valve body.
The other four codes well that may be tough to diagnose. See P0171 and P0174 are bank 1 and 2 are lean and
P0172 and P0175 are bank 1 and 2 are rich.
To have both banks coding rich and lean would be extremely rare.
I suspect you have a couple of problems like may be a MAF sensor problem, a vacuum leak, and maybe a restriction in the exhaust.
The exhaust restriction would be easy to diagnose. You would need a vacuum pressure gage and hook it into the hoses from the DPFE sensor. You should have 1PSI or less at idle and 3-4 PSI at wide open throttle anything more would be a restriction.

Posted on Apr 14, 2009

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