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MBittner

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  1. Hello all, I wanted to give an update on this post in case anyone else runs into the same issue. I appear to have solved the problem. The backfiring was caused by a rich condition. Basically when the engine warmed up it was running way too rich causing fuel to build up in the exhaust and detonate on deceleration. This also caused the stalling. The way this all started was that my Tillotson carburetor had a lot of leaks due to warpage. It was severely warped between the two housing halves, and at the manifold. So it had fuel and vacuum leaks. I replaced it with a brand new Tillotson. The reason the new carb didn't fix the issue, and made it worse, is because I set the base line mixture settings on the new carburetor based on the old carburetor settings. Whoever set the mixtures on the old carburetor had set them rich to compensate for the vacuum leaks. Once I realized this, I leaned out the idle mixture on the new carburetor by about a 1 1/4 turn, and the issue cleared right up. A backfire out of the tail pipe is NOT caused by a lean condition, but a rich condition. I hope this helps.
  2. Yes, it has points, but someone before me upgraded them to the newer style. My next steps are to check the points and timing. I actually replaced the condenser about two years ago just because I heard it was problematic. I will swap it with the old one and see if there is any change.
  3. At this point I don't think it's a carb issue. The new Tillotson is brand new, and it runs a lot better than the old one. The GAV was stripped out on the old carb. What is a normal setting for the GAV? I was running about half turn open at 45mph when it stalled coming to a stop.
  4. Hello everyone, I have a Model A that has started to stall when coming to a stop from a cruising speed. This seems to only happen after driving for several minutes with a warm engine. There is also an occasional loud backfire out of the tail pipe between shifts, or on decel. The car otherwise runs perfect. I am running a Tilotson carburetor which is now brand new. This problem also occurred with the old Tilotson carburetor which was replaced due to the housing being severely warped. Has anyone else experienced this issue before, and if so what did you find?
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