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Old 05-10-2011, 12:07   #1 (permalink)
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Mark VIII rough idle, IMRC noise?

Hi. I have a 95 Lincoln Mark VIII, which has been having rough idle issues. It started off a little rough and got progressively worse. It seems to run better as the RPMs increase. Cruising at low RPMs, it's rough. I changed the plugs and wires, "seafoamed" it through the vacuum hose at the brake booster, and poured some in the gas tank. I replaced a few pieces of vacuum hose, pcv elbow. I cleaned the throttle body. I reached in and moved the rod for the passenger side IMRC, and there was little resistance. The driver's side seemed to barely move, but I could hardly get a grip on it. There is also a noise that seems to be coming from the intake that almost sounds like a lifter. I can't here anything from the cilinder head area. I used a hose to listen down between the pipes on the intake. Seems to be coming from there. Do stuck or malfunctioning IMRCs make that sort of noise? Should the actuator rod move freely, or with some resistance? Should I be pushing down, or pulling up on that rod with the engine running? What conditions would a malfunctioning IMRC cause?
Thanks.
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