87 320i automatic crank no start

[Beemer Fever]

Hi Everyone
I have a 320i 1987 automatic. I have been struggling with intermittent crank no start. I have no spark. And I don’t hear injectors pulsing. I checked my main relay. Pin 30 should be hot but it’s not. Pin 86 seems to read 12v with ignition on. I have heard about an obc black relay box under the dash which cause an issue like mine but not sure if my car has one. Most of the info seems to be for the 13 button obc. I remove the cubby and panels and don’t see a box like that.

 

[rash777]

Check the earth straps, there is one under the intake manifold, my E30 had the same problem and that strap was the problem, after cleaning it car fired right up. Might be worth a shot.... good luck.