1948-LS

Thanks for the advice, but I think it may be more than that. Right now it dosen't run. It cranks great, but dosen't even try to start. After about 7-10 seconds of cranking, it explodes out the muffler. All of the ignition parts are new on both systems: plugs, cap, rotors, ext. Carb has been rebuit. Adjusted the valves. Even the timing "looks good". It also has good compression. I think I will try disconnecting the muffler. It may be clogged up from the last owner running the truck for miles with the choke on when the throttle got stuck. The only ignition parts not replaced are the coils. Will test them next. Also in need of a manual for the ENF707A if anyone haas one for sale. THANKS

I am having the same problem with my 1948 mack l-model with a enf707a gas engine. I'm working on it now. Have you come up with any ideas yet? If I find the problem with mine, I'll let you know.