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Sounds like you need to get your transmission serviced as the darkened color is a sign of deteroration. As for oil to somehow make it into the transmission you would need one serious oil leak and the grommet around the tranmission dipstick would have to be pretty much gone for oil to somehow make it into the housing. Needless to say I've never seen it happen.
the knock sensor is located at the center of the engine in the rear, heres a diagram witha list of the sensor locations,it shows the knock sensor, it looks like its in the front of engine but its not its in the rear, good luck.
you need to adjust it.. take it to a dealer probly cost you a lil bit 400 bucks.. but its a toyota you defenitely dont need a new engine .. just a lil tuning will do the job.. also check if its the water pump that might be the knocking sound your hearing common sickness for vvti engines..
First of all change the fuel filter. If that doesn't get it, change the spark plugs. If that doesn't help, check for vacuum leaks. Check all intake bolts for tightness. With the engine running, use a stethoscope, or a length of fuel line held to your ear and listen for a hissing sound. Wiggle all your hoses around and check for loose ones or cracked ones.
DTC 52 on a 93 Corolla is a Knock Sensor code. I replace the knock sensor; it is located on the side of the engine block, on the side of the engine that faces the firewall. It is in the center; under the intake manifold.
The idle issue is normal. The idle is controlled by the ECU. There are no adjustments for the idle. Regarding the knocking noise, that could be several things, and I am hesitant to comment without hearing it. Take it to a Toyota Dealer & have a tech listen to it. We are very good at identifying noises on the service drive.
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