My 1990 acura legend dos'nt have crank pulley holder hex

No, it is not. Acura, and Honda Harmonic balancers, (the crank pulley), come off fairly easily once unbolted. Sometimes you have to pry on them a little, but I've never had any difficulty removing them.

It could be anything from faulty coils, injectors, head gasket. Did the car over heat? Has it been regularly maintained, is it low on oil?

try asking at the dealer or buy a haynes manual ,yes i know the haynes manuals are not very good but they should have a fuse wiring diagram .

Maybe this website helps you. You find there fuse box diagram and description for Acura Legend 1990

Acura Legend 1990 wiring diagram fuse box

properly connect a timing light aim it at the marks on the flywheel or crank pulley disable timing advance and turn the distributer until the timing mark lines up with the zero mark

THE MAIN RELAY HAS BAD SOLDER CONNECTIONS TO THE PRINTED CIRCUIT BOARD. THE HEAT IN THE CABIN ALLOWS THE CIRCUIT TO OPEN. I HAD LUCK RE-SOLDERING THE LEGEND'S RELAY AND DIDN'T SPEND THE $ ACURA WANTED.
YOU SHOULD HEAR THE PUMP WORK FOR A FEW SECONDS WHILE THE CHECK ENGINE LIGHT IS LIT (WHILE YOU CRANK).

looked it up online, looks like its in the underhood fuse box but couldn't get a good diagram that shows which relay number it is. the website i use is sort of dependent on the manufacturer, apparently acura did not feel like sharing that info. hope that helps

a 91-95 bodykit will not work unfortunatey.but you can purchase one for older legends. Try Hondatuner magazines website

I had a tough time with this not having a powerful enough impact wrench. I ended up taking a tie-down strap wrapped around the pulley with the ends secured to the frame and just cinched it down tight until the pully could no longer move. I also extended my breaker bar with a 3' pipe to get leverage. Crude, but effective for a bolt torqued at 174 ft-lbs.

The main relay which is located under the dash is bad.