Quote:
Originally Posted by 964 T #304
They did the same thing in the 60's on some GM cars with a little selenoid valve on the throttle linkage that kept the throttle open a little on de- aceleration on the automatic cars to keep them from dying when you let off the gas .
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Yep, I remember those too. I've been around a while..
The 12 volt solenoid on the throttle linkage of those old USA cars was energized when you turned on the AC and it mechanically pushed the throttle linkage idle speed stop open a little to keep the rpms from dropping or the engine from stalling while decelerating to a stop when the AC compressor came on.
There was also a little saucer shaped gadget with a diaphram in it called a dashpot on some carburator linkages and it acted as a little pnuematic shock absorber in the throttle linkage that kept the throttle butterfly from snapping shut if you let off the gas quickly all at once.
It would make the linkage delay final closing of the throttle butterfly for about 1-2 seconds so the engine wouldn't stall after reving on heavily smogged cars and some muscle cars running a rich mixture and huge carburator that would almost stall after reving the engine.