This 1991 Porsche 928 factory service and repair manual is built around the year, engine and trim actually stamped on your car, so the torque values, clearances and diagnostic steps inside are the ones Porsche specified for the 5.0L V8 (VIN A) or 5.0L V8 (VIN B) under your hood, not a generalized 928 procedure.
Engines
- 5.0L V8 (VIN A) Gas
- 5.0L V8 (VIN B) Gas
Trims
- GT Coupe 2-Door
- Base Coupe 2-Door
Known issues on the 1991 928. One recall is on federal record for this model year, covering the automatic transmission: a plastic filler piece inside the transmission was installed without sufficient support and can shift under hydraulic pressure, which can prevent the transmission from kicking down to a lower gear when the accelerator is pushed to the floor, so the expected burst of acceleration during a passing maneuver may not occur. No complaints or technical service bulletins are logged for the year. The factory diagnostic and repair procedures behind that system are here.
Whether you're inspecting the kick-down linkage on the automatic transmission or working through a routine service interval, it keeps you on the OEM procedure and the correct specification for your specific 1991 928.
A PLASTIC FILLER PIECE LOCATED IN THE AUTOMATIC TRANSMISSION WAS INSTALLED WITHOUT SUFFICIENT SUPPORT. THIS FILLER PIECE CAN MOVE BECAUSE OF THE HYDRAULIC PRESSURE IN THE SYSTEM, AND NOT ALLOW THE AUT
IF THE ACCELERATOR PEDAL IS PUSHED INTO THE KICK-DOWNPOSITION, THE EXPECTED ACCELERATION OF THE VEHI
DEALERS WILL INSTALL A NEW FILLER PIECE WHICH HAS A SECURING BRACE TO PREVENT MOVEMENT.
Information for PIWIS tester update 42.300.050 & .052
Instructions on manufactures certificate for approved Porsche A40 engine oils
Instructions on manufacturers certificate for approved C20 engine oils
Instructions on manufactures certificate for approved Porsche C30 engine oils
Information for PIWIS tester update 42.300.035
Information for PIWIS tester update 42.300.040 & .041
Information for PIWIS tester update 42.300.030 - .032
Parts information for parts withdrawal involving the glass roof - 9J0877069EY and 9J0877069DY
Showing the 8 most recent of 76 technical service bulletins on file with NHTSA.
