First you must understand how the system works to detect misfires. I’ll see I can get this right. The Motor Electronics (ME) computer uses the L5 (crank) sensor for a few things one of which is telling the ME how fast the engine is running. The ME can see the slightest variation in crankshaft speed. As a cylinder fires it speeds the crank up a given amount and the engine itself moves because of this. When a weak cylinder fires the crankshaft doesn’t speed up as much and the ME flags the misfire and shuts the injector off on that cylinder to protect the cats from damage. Now with flat motor mounts the engine doesn’t rock or move as much as it will with good mounts. When the engine doesn’t move from flat mounts the crank actually spins faster because the inertia isn’t lost in the mounts flexing. With new mounts the ME will see slower crank speeds because now some of the inertia is lost as the mounts flex.

Does this make sense and clear up why the adaptation must be done?

fasthair