Can’t set ignition timing
I know it's not a 2002, but I figured this is the largest knowledge base I could find.
I have a ’75 Euro 520i with KF injected 2 liter M10, mechanical advance only on distributor.
Under light acceleration or at steady speed, there is a slight bucking or surging.
Since owning, I have replaced points, plugs, condenser, rotor, cap and wires.
Marty from H&R checked out the injection pump and made some adjustments. It runs much better than when I got it. He said it is still running a bit rich and suggested a rebuild.
Before I go that route, I want to exhaust all other possibilities. Problem is that I have only been able to set the ignition timing by feel. I believe the marks (either ball on flywheel or notch on front pulley) should line up at 2500 rpm. There is no way to hold a steady rpm; it just wanders up and down.
My question to you folks with more experience is: could there be a problem with the distributor advance (the plate with the points on it snaps right back when I rotate it and let it go and I wouldn’t know what else to do) or should I have the KF pump rebuilt (the 2500 rpm spec is right in the middle of the range where surging occurs).
Thanks for any advice you can give me.
Bruce