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Warm Start Problem 140-160 1974

posted by  someone claiming to be Ira Eisenberg on  Wed Sep 17 09:41 CST 2003 [RELATED]

I had the opposite problem.........that is mixture a bit too lean when engine was cold. Ironically the problem shows up during warm weather but not during winter. I replaced the coolant temp sensor which helped a bit and then spliced a variable potentiometer ( I seem to remember using a 5K ohm) in series with the coolant temp sensor. Dialing in a bit richer mix at startup smooths out idle; no stalling and after a couple of minutes running, dial the potentiometer back to zero resistance. To add acccuracy, I installed a generic oxygen sensor in the exhaust pipe just below where its connected to the exhaust manifold. This feeds an air/fuel ratio gauge. Good luck






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