Remove rear carpet. Remove spare tire in recessed tire compartment. There will be a small hatch with a plastic white lever that you have to swing open. Once the door is open, remove ground (black) first, then the positive red side. Clean terminals and also clean ground to rear hatch from battery.
SOURCE: 1986 porsche 928 intake removal and replacement of sparkplugs.
You dont need to take off the intake manifold but the cold air intakes these unclip grab the convaluted tubing and pull it straight back out of the aircleaner then lift it up and un clip the bottom then pullit out of the intake snorkle
SOURCE: Adding automatic transmission fluid to Porsche 928 S4
Mine is an 88 cant imagine its different, thereis a plastic tank on the rhs of the trans that has a screw off lid, you will need the car on stands or a hoist level and with the oil at opperating temp you will also need a bottle pump or some type of plunger to fill it the engine must be running and add the fluid slowly allow time for it to be taken into the trans repeat until at the mark and stays there
SOURCE: porsche 928
open trunck , look behind rear panel look for plastic nut ,loosen and pull on tail light .
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