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Fuel Pump Check Valve & Fast Idle Control 1800 1973

posted by  Chris Mullet on  Sun Oct 25 15:51 CST 2015
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last visit: Fri Oct 24 09:08 CST 2014
[RELATED]

Issue 1.) The cold idle is too fast. When it's warm and the fast idle valve closes, the idle is right on. I seem to recall on our old 144 or 142, there was an in-line valve in the cold idle circuit by which I could limit the volume of air that flows through the circuit when the thermal valve is open. Has anybody ever seen such a thing? BTW - I'm not confusing it with the A/C triggered valve that that increases bypass air through that sort of "H" fitting when the A/C clicks on. I plan to reverify that valve is closed when it's not energized. Anyone ever seen that extra adjustable valve?

Issue 2.) The car seems to suffer from fuel drain-back when sitting for a day or two, causing starting issues. I have to cycle the pump several times to get it to catch. Once started, it runs fine (except for fast cold idle). Does the fuel pump have an integral check valve? Oh yeah, I also plan to verify thermal timer/cold start injector function.

Thanks again.






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