We tried a new #1 TPS sensor, but nothing changed, so next up was the pedal assembly, which is actually an easy swap. Simply use a screwdriver to press down that white tab, and you should be able to wiggle the pedal assembly out to your left. Just be careful not to brake the tab if you can.
Unfortunately, changing the pedal didn’t do anything either, so now it was time to remove the intake manifold. In order to reach TPS #2 on the throttle actuator, you must remove the intake manifold, which is surprisingly easy when you compare it to the removal of an E46 325 or E36 M3 or 325i/328i. Thank you, BMW, for individual throttle bodies—because for once the higher performance made things much easier to work with under the hood! Well, maybe until the day we decide to remove the actual throttle bodies at least.
To remove the intake manifold, I forced my girly hands to remove the airbox. Start by loosening the clamp to the air mass sensor housing (which is part of the airbox), and the clips on the air box itself with a screwdriver. Don’t forget to unplug the air mass sensor itself (which of course we don’t use being Speed-Density, haha!)
Remember this little Macht Schnell air filter and intake boot? We tested it in Part 1, and it is probably still the best bang for your horsepower buck for the E46 M3.
Unplug the xenon ballast, pop the cover off, and remove the two 10mm screws.
Remove the nut holding the dip stick tube in place. And there is that black plastic radiator splash shield I was referring to earlier, which we’d removed to previously gain access to the alternator by removing the coolant pipe as well.