Engine oil leaks are known to develop around the rear crankshaft (main) seal and engine oil pan gasket.
Resources for the Repair and Maintenance of your 1991 Ford Aerostar
1991 Ford Aerostar
1991 Ford Aerostar Problems
If you experience poor idle quality and fuel economy (and the Check Engine Light illuminates) after the exhaust system or motor has been removed and replaced, it could be that the oxygen sensor wires are crossed at the rear of the motor. Wiring schematics should be checked to ensure that the correct harness plug is connected to the corresponding sensor.
The valve cover gasket may fail, causing engine oil to leak onto the exhaust manifolds.
If a noise from the rear end is heard when going around turns or after driving at highway speed for an extended period, this could be caused by a failing deferential clutch kit. An updated differential clutch kit available.
An engine knocking noise coming from the lower end during acceleration is common and could be caused by worn or damaged engine bearings.
1991 Ford Aerostar Recalls (Recent)
Summary: SEAT BELT ANCHORAGE BAR FOR REAR SOFA FAILED TO SUSTAIN LOADS REQUIRED BY FMVSS 210.Learn more »
Summary: EQUIPMENT DESCRIPTION: AFTERMARKET BRAKE ROTORS FOR USE ON CERTAIN FORD AND MAZDA TRUCKS. CRACKED CASTINGS CAUSED CRACKS TO APPEAR ON THE OUTER DIAMETER OF THE ROTOR HAT OR AROUND THE STUD HOLE.Learn more »
Summary: WHEN THE AUTOMATIC TRANSMISSION SHIFT LEVER IS PLACED IN THE PARK POSITION, THE PARK PAWL DOES NOT ALWAYS ABUT OR ENGAGE THE PARK GEAR.Learn more »
1991 Ford Aerostar Questions and Answers
I've run the devil out of my Aerostars over the years -- and I now still have my third one a 91 with a 3.0 which I have used as a commercial vehicle in the past with good success (including th...
what may be wrongwith my vehicle
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