I have no spark on cylinder number four in my 72 mod. 350 slc.
Have new plug wires, new points, new rotor, new rotorcap. Starts easy warm and cold but use a lot of gas. Tried with another plug wire but still no spark. Any ideas.....???

I suspect the distributor cap terminal for No. 4 cylinder is defective, consequently no voltage is being distributed to that spark plug.

__________________
Fred Hoelzle

How do you know you're getting no spark on that cylinder? It has to be either the cap, the wire or the plug.

I would have to agree with the above statement. I have seen caps that had cracks that were not evident to the naked eye, but would prohibit a particular cylinder from firing. Good luck

__________________
96 E300d

Thanks for your advice. I will change the cap but it's only when the engine idles. When I rev the engine I got spark on all cylinders.

Soooo, the pertinent question, already asked is, how do you know you don't have any spark at idle?

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

I connected a timing gun to the wire. No light when the engine idles. Only when I rev it. Light in the gun on all the other cylinders.