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Message: <blockquote data-quote="E30 newbie" data-source="post: 195424" data-attributes="member: 5146">thanks for reply...humm.... AFM? is it the sensor unit located at the air filter box? the unit already replaced by my mechanic. initially, the mechanic thaught that is the problem, but replacing the unit did not cure my car.firing order is correct, even the timing chain have been check and re-check to ensure that is is correct.what can cause the spark plugs to go hairwire?i read somewhere on the internet that u can use the ECU unit to pinpoint the engine problem, is it true? where can i get that kind of service here in klang valley?btw, i love bmw..... we all do.</blockquote>