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Re: PROBLEM: Reduced Engine Power and Service Active Handling
GR8, I'm betting the problem is resolved. I doubt disconnecting the battery made any difference, I'm more inclined to believe a long, hot "soak" cooked off (all or most of) the water that got in to the sensor. If there's still any issue, I bet it's lessened from before and that after a few more heat cycles the car will be cured.
Next time you power wash your motor, stay away from the TB, or wrap it in a plastic bag or something.
One additional caution - from experience. The Knock Sensors are located in "wells" in the center of the block under the intake manifold. Water can accumulate in those wells and when it does, it rusts and ruins the sensors necessitating their replacement. Unfortunately, the PCM won't necessarily throw a code, it just never detects knock even when the motor pings like crazy. I had this exact issue on my 98 Coupe.
I remember a GM TSB that actually advised the mechanic to run a bead of silicone around the KS opening in the valley cover to act as a "dam" to keep water from getting in. That's for "normal" water incursions. Your hosing off the motor is probably letting a significant amount of water get under the manifold, you might want to break your wash-down habit altogether because of this concern. Otherwise you may end up without knock retard protection.
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