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Originally Posted by ROFL it's Waffle
So to speak to the 500 rpm, my WRX had similar symptoms when I did my exhaust, intake, and EBCS. I was surprised to learn how much the MAF sensor was tied to ABS, TCS (wheel speed sensor). Although I agree that your wiring to the wiper fuse is puzzling, maybe clean your MAF sensor with some MAF cleaner. But maybe your car went to limp mode because of the questionable wiring. This is why I'm a mechanical guy, I despise electrics lol.
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It doesn't take as long as people think to pull out sensors and test their resistance. Tedious but it may be the solution (although it could be as simple as plugs, fuel injector cleaner, or an air filter!) I had a similar problem with my Fiancée's Impreza, low RPMs, occasional cam position sensor, and rarely a cyclinder misfire code. I replaced on cam sensor that didn't read out the right ohms and that made it better but it was still a little wierd with the RPMs just less codes thrown so I ran a bottle of injector cleaner and the car drives normally again. The issues can be the same or different but the approach is the same. Test anything that might be a problem and fix the cheap possibilities first.
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