Hi gents. New to this forum and new to owning GT40 so please bear with me. I now own SPF GT40P2116. Having trouble starting and keeping it running. Backfires frequently thru exhaust. Pulled plugs, Motorcaft AGSP32C, all oil fouled equally, no white on porcelain. Plugs are all black, not dripping, no carbon buildup. Car has MSD6AL ignition, Roush 427, Holley 770cfm 4 bbl
with choke wired open. Replaced plugs with Autolite APP3924. NAPA parts store does not carry Motorcraft plugs and said Autolite plugs are cross referenced to replace Motorcraft. (by the way what is spark plug gap, old plugs were about .040 give or take), Cranked engine over with inductive timing lite and got a lite at each plug. Searched the net for trouble shooting MSD but got no satisfaction. Have no trouble shooting old timey points and condenser and Pertronix on other cars but am a total loss at this kind of problem. would welcome any suggestion or advice. [email protected]
with choke wired open. Replaced plugs with Autolite APP3924. NAPA parts store does not carry Motorcraft plugs and said Autolite plugs are cross referenced to replace Motorcraft. (by the way what is spark plug gap, old plugs were about .040 give or take), Cranked engine over with inductive timing lite and got a lite at each plug. Searched the net for trouble shooting MSD but got no satisfaction. Have no trouble shooting old timey points and condenser and Pertronix on other cars but am a total loss at this kind of problem. would welcome any suggestion or advice. [email protected]