92 900T APC Box mod issue - Saab 900 Bulletin Board - Saabnet.com
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I performed the "900Aero,com" APC mods consisting of replacing the resistors at R42, R138 and replacing R40 with a wire. I did not adjust the pots. While it did great things for the performance it made my APC valve go into a constant state of knocking. I disassembled the case, rechecked the connections, no cold joints...looks ok. Any comments or advice?
The APC Box = 7566599 / R40 = 1300 ohm / R138 = 40.2K
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