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Wax Valve/Vacuum Hoses/Firewall Solenoid Valve 200 1980

posted by  Ten Sleep on  Sun Mar 20 15:20 CST 2005
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last visit: Mon Apr 14 16:35 CST 2014
[RELATED]

Hi,

I am working on a 1980 245DL, California model. I need to get the smog test done and have been working on the emissions system for this car. I have cleaned the throttle body, the IAC valve, the injectors and the part that the black plastic idle screw fits into. I have replaced the gasket for that part as well, replaced the injector seals, the O2 sensor and the exhaust and intake manifold gaskets. I have set the timing @ 6 deg. BTDC. The old girl does not idle well when cold; I am not sure how the wax valve is supposed to work. Right now, there are no vacuum lines going to the valve, although there are two fittings for lines. There is a solenoid valve mounted on the firewall that has a vacuum line running to the intake manifold; the other nipple on the solenoid valve is capped. If I remove the cap when the engine is warm, the solenoid valve is open, allowing air to enter the intake manifold through the valve, increasing the idle RPM. I have not checked it's function with the engine cold.
I need help figuring out how the vacuum is routed through the wax valve and the solenoid valve. I also believe that there is another cold idle control mounted into the block; I saw it when I had the intake and the throttle body off to clean. The sensor was towards the back of the block, underneath the intake manifold. I cannot see it with the engine reassembled. The plug to this sensor looked suspect; it had been repaired with RTV. How important is this sensor and what is its function and name?

Any help would be greatly appreciated. If pictures will help you help me, I can post them.

Thanks again!





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