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After consultation with a BMW forum, an expert in MS S52 reverse-engineering had this to say: As for why BMW has multiple knock maps - it's probably just because they could. Their engineers probably also experimentally determined what the signals look like when the engine is knocking.


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(NOTE: Since you aren't talking about an ancient fuel filter, I'll change my answer ...) This appears to be BMW's version of a PCV (Positive Crankcase Ventilation) valve. It's purpose is to pull gasses which have passed by the piston rings and into the crankcase and force them back through the intake system to be burnt. It doesn't necessarily filter the ...


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Location It's located between your throttle body and the manifold. You would remove the air intake and the throttle body from the manifold to best accesss the EGR and clean it. Video Here is a youtube video cleaning of an EGR (exhaust gas re-circulation) valve that is a similar model to yours. Supplies To clean the valve you will want carb/brake ...


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Usually when I hear what you are describing, I put the issue at the front end of the transmission, either with the front bearing or the carrier bearing supporting the input portion of the transmission. Here is my reasoning: Your description places the noise/vibration when the transmission is engaged in neutral, which means the clutch is engaged with the ...


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Yes, it is quite common. I initially said that it isn't, but I was wrong. I had another look at my Subaru's mapping and saw that there are more ignition timing tables than I first thought. Here's a complete list of tables (note the greyed out ones): Factors that could warrant separate knock maps for each cylinder would include the following: differences ...



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