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Re: Air leak on the back of the plenum
Have you tried using a short length of hose as a stethoscope to better locate the noise?
Wiswind mentioned the EGR regulator valve. This valve has an intentional "leak" ... it leaks in air to help control a vacuum signal. This valve may need to be replaced ... or it may be missing the round filter piece that sits on top. This filter, if missing, would allow some dirt to leak into the system ... and it might allow some noise.
The '99's IMRC actuator (only a single motor) is all-electric.
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