I installed four Bosch IR Fushions in my 1993 318is a year ago and the engine blew a cylinder within a week. Sold that car while running like shit and bought a 1994 325i. I installed 6 Bosch IR Fushions in my 94 325i last week while changing the oil. Now the car is miss firing/stalling and basically not wanting to run. The engine light turns on and off and I have to rev the car to 3k just to keep it from stalling.
What is the deal with the Bosch IR Fushions? Or am I just having bad luck?
My thought on spark plugs is that unless you have something crazy done to the engine, boost/stroker/cams, I don't see a reason to switch from the spark plug BMW put in the engines from the factory. The factory plugs are going to be the right heat range, right resistance and have the right reach into the cylinder. I run the factory plug in my M50 with CAI, chip, pullies and cat back and have had zero missfire issues.
Quick update: Turns out that my Mass Air Flow Sensor is the problem. I guess it really was bad luck... the car runs Perfect until I decide to do some maintenance work on it!!! CRAZY! The plugs are correct and defintely not the problem.
So, has anyone replaced a Mass Air Flow Sensor? I am picking one up tomorrow and was planning on installing myself. It seems pretty basic.
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