The idle on my 2001 Expedition 4.6L goes up and down between 500 and 800 RPM quickly when in gear like at a stop light. When it is in park it idles just fine. I just put new plugs in it. This problem existed before the new plugs along with some other issues. The other issues went away while this one did not. I did notice when I changed the plugs that one of the coils had a different ohm reading than the rest. Seven of the coils had .1 ohms and one had .22 ohms. Could this coil be the problem. The service engine light is not on.
2001 Expedition idle
Sep 30, 2003
1 Replies
With some vehicles, the idle speed will momentarily increase if you release the brake and let it creep foreward, even a few inches, while stopped. I don't know if this is a sensor thing, or a brake booster vacuum thing.
Gary in IN
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