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Cape Codder · 10-13-2018, 06:55 PM

FIRST I want to thank everyone that has responded to my "Terrible backfiring" post.

We have tried: changing the distributor body & cap, re-gapped the points, changed the condenser, changed the coil & coil wire, re-timed the engine, checked for vacuum leaks at the intake/exhaust manifolds, did I say retimed the engine cause I forgot to tighten the screw on the cam, used a jumper to check the ignition switch, adjusted the GAV from almost closed to 1/4, 1/2, and maybe as much as 3/4. After these few checks, we still have a Terrible Backfiring.

Soooo.......we are thinking of changing the plugs. We found the washers? on the bottom of plugs crushed and don't seem to be sealing. Don't know for sure about that but they sure are flat. However, the plug tips are a lite tan color with no oil or soot.

I have Champion W16Y plugs in there now but which one do most use looking at the below chart which was posted by someone on this site? Should I have a hotter or colder plug?

Champion (hotter down to colder):

W95D
W89D
W16Y
W20
W18
W14
W10
W85N
W80N

Thanks for any help you can supply because we are at witts end with this problem.

10-13-2018, 06:55 PM	#18
Cape Codder Senior Member Join Date: May 2010 Posts: 1,262	Re: Terriable backfiring FIRST I want to thank everyone that has responded to my "Terrible backfiring" post. We have tried: changing the distributor body & cap, re-gapped the points, changed the condenser, changed the coil & coil wire, re-timed the engine, checked for vacuum leaks at the intake/exhaust manifolds, did I say retimed the engine cause I forgot to tighten the screw on the cam, used a jumper to check the ignition switch, adjusted the GAV from almost closed to 1/4, 1/2, and maybe as much as 3/4. After these few checks, we still have a Terrible Backfiring. Soooo.......we are thinking of changing the plugs. We found the washers? on the bottom of plugs crushed and don't seem to be sealing. Don't know for sure about that but they sure are flat. However, the plug tips are a lite tan color with no oil or soot. I have Champion W16Y plugs in there now but which one do most use looking at the below chart which was posted by someone on this site? Should I have a hotter or colder plug? Champion (hotter down to colder): W95D W89D W16Y W20 W18 W14 W10 W85N W80N Thanks for any help you can supply because we are at witts end with this problem.