This 1990 Porsche 928 factory service and repair manual is built around the GT and Base coupe specification, with procedures and torque values matched to the 5.0L V8 (VIN B) rather than a generic V8 writeup pulled from another model year.
Engines
- 5.0L V8 (VIN B) Gas
Trims
- GT Coupe 2-Door
- Base Coupe 2-Door
Known issues on the 1990 928. One recall is on federal record for this model year, covering the fuel tank assembly: the plastic fuel gauge mounting nut can crack and allow fuel to leak from the tank, and if that fuel reaches a hot exhaust system or another ignition source it can result in a fire. No complaints or technical service bulletins are logged for the year. The factory diagnostic and repair procedures behind the fuel system are here.
Whether you're inspecting the fuel gauge mounting nut and tank seal or working through routine V8 service, it keeps you on the OEM procedure and the correct specification for your specific 1990 928.
PLASTIC FUEL GAUGE MOUNTING NUT MAY CRACK AND ALLOW FUEL TO LEAK FROM THE FUEL TANK.
IF FUEL COMES INTO CONTACT WITH A HOT EXHAUST SYSTEM OROTHER IGNITION SOURCE, IT COULD RESULT IN A F
REPLACE MOUNTING NUTS WITH NUTS OF AN IMPROVED MATERIAL.
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.
