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Continuing Idle Issue ... can not get down past 760 RPM w/ IAC disabled 200 1988

follow up on climate control line ...

- I pulled the inside panel under passenger side of dash to check the oppostie end of climate control vacuum line.
-- Found fists full of dried leaves. No indication of a rodent. I assume outside air inlet brings in leaves.
-- Disconnected climate control vacuum line at check valve ... this time I can hear the air equalize from the vacuum in the vacuum tank. I checked pressure in line by blowing through from engine compartment. This time I kept applying pressure and after three breaths the line pressurized.
--- I had someone else blow through the line while I laid with my ear down near the vacuuum tank. I could hear them applying pressure and the increased difficulty with the last breathes. No sound of pressure lost.
--- I turned on the engine and laid with my ear down near the vacuuum tank. I operated the push button controls and could hear the different doors open and shut and sounds of air movement. I could hear no hiss while the engine is running that would indicate an air leak.
- I do not believe there is a fault in the climate control line.
--
1988 244 DL; B230F; LH-2.2; Manual 5-speed (M47)






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