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Intake Resonance System Overhaul for the 1991-1993 E34 ///M5 21 Seiten https://mmm-five.net/Articles/files/...esOverhaul.pdf
System Background
• The intake resonance system is used to increase the torque at full throttle when engine speed is less than 4120rpm and greater than 6720rpm. At
3500rpm the average torque is increased by approx 15%
• The system is not energized (valve left open) if engine speed is not within this range AND full throttle is not applied.
• During engine startup the resonance flap can be observed performing its self test (evident by looking at the linkage at the top of the intake plenum).
My 1991 M5 (145000 miles) did this intermittently and then finally ceased this self-test. My 1993 M5 (41000 miles) does this self-test at EVERY
engine start.
• As the system ceases to function, a substantial drop in torque is felt in the 2500-4000rpm range. This is often accompanied by a “switch-like” response
as the engine torque increases rapidly In the 3500-4000rpm range. Here is a comparison of engine torque for a properly working resonance flap and a
non-operational one.
Intake Plenum Removal Instructions
Resonance System Vacuum Line Removal
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