1992 e34 wont start but cranks

[shaun535i]

hey to all-
new to this site.
i have a 535 and its a dream car but...
it now just wont start.
changed the fuel pump,checked air flow,check 02 sensor,checked crank shaft sensor, checked for spark,fuel,checked for vacumm leak, check plugs that are full of fuel....so its pumpimg too much fuel and backfires but keeps cranking and wont start. no check engine on or any warnings signs---
I think my option is try now the cars computer...
any ideas...
thank you

[brettski]

Welcome to the Werkz.

Was any work done to the car prior to this issue occurring?

[shaun535i]

hello,
no work was done except regular maintenance.
it just decided one morning not to start .
today i will try again.
i have checked all items
plugs
vacumm
02 sensor
wires
my only test now is computer main board