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Strange high idle, common issues ruled out 140-160 1968

posted by  drj434343 on  Mon Aug 10 15:45 CST 2009
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last visit: Thu Oct 24 09:46 CST 2013
[RELATED]

I've had a chance to address several of the suggestions made, without success.

First, I totally rebuilt the distributor, thinking the timing advance weights may have been gummed up. They were dirty, but after reinstallation, the problem remained. I have new plugs, wires, rotor, cap, points, and coil installed as well.

Second, I got ahold of another manifold, one without secondary butterfly valves, or a crack. I made sure the port section was totally flat before installation, and I used a new manifold gasket. Still, no affect on the problem.

At this point, once warm, the car idles just below 2000 RPM. The carbs were just recently professionally rebuilt. I have them tuned to 12 flats down, and the idle screws at 180 degrees past engagement. I can artificially lower the idle by leaning the mixture, or messing with the timing, but nothing to bring it even close to normal idle levels.

At the current idle speed, it seems like it would have to be something obvious but I've literally replaced everything between the carbs and the head, and I can't think of what else to do!!

I'm dying! Help!






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