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Info: I have 02 bmw 325i and I’ve recent had a bunch of codes (misfire,random misfire, running lean) I had a new thermostat put in and it fixed all of them but the lean. I had o2 tested and installed new bremi mass air flow, new coils, spark plugs. After replacing those parts and then taking car to mechanic and having fuel adjusted, this knock/tick I had had turned into a slight knock/tick. I feel like it’s coming from coil pack area. Not the disa valve. I checked to make sure plugs and coils were tight and working properly and they are. But I do have a small leak on the left side , on the lower back art of motor. Leak isn’t bad, engine does smoke sometimes. I barely have any oil lost/burned between oil changes tho but I’m wondering if that could be the cause.
- and a side question.. are bremi boots and coils and ngk sparks a good bran to be installed? I know bmws are picky with brand and quality parts that you put on
 
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