Quote:
Originally Posted by brianhiggi
I have a '78 SC that had been sitting outdoors for a few years. I got it started but when the engine warms up the idle starts to go up and down. I have read on other threads that the warm up regulator may be at fault. I took the wur apart and didn't see anything that looked amiss but I don't know exactly what to look for. Could the idle problem be something else?
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Brian,
Start your engine and keep it running until you get into operating temperature (very warm engine). Driving it around is preferred than just letting it idle to get to operating temperature. Once the engine is fully warmed up, park the car safely and remove the oil filler cap. The engine RPM (idle speed) should drop down from 950 to 700 rpm more or less when you removed the oil cap. If you don't observe any noticeable idle change, you have unmetered air going into the system.
Lastly, think twice before you tinker the air mixture screw!!!! I would not recommend touching it until you have verified and confirmed that you don't have a vacuum/air leak. Not being able to find one does not mean you don't have a leak. So a pressure test is required to avoid the guess-work. Keep us posted.
Tony