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Can a 501/520 and 516 IAC Valve be swapped? -No. 200

posted by  FitzFitzgerald on  Mon Feb 9 17:10 CST 2004
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last visit: Wed Jun 25 23:15 CST 2014
[RELATED]

After performing a tune up on a friend's '90 240, I've had a chance to further inspect a 516 IAC Valve and it's associated plumbing and two major differences are present. I've outlined them below:

The 501 and 520 IAC valves require electrical power to both open and close the valve. The 516 is spring loaded and power is supplied only to Open the valve, and it snaps shut when power is disconnected. The other major difference is that when a 516 is closed, it isn't really completely closed. It is still open slightly and alows a predetermined amount of air to pass through it. The '90 240 that I was working on did not have an Idle Speed Set Screw (black thumbwheel) on the throttle body, and it would seem that the 516 has eliminated the need for one.

To answer your question: "Can a 501/520 be swapped with a 516?" I'm sorry to say the answer is no.

God bless,
Fitz Fitzgerald.
--
'87 Blue 245, NA 231K






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