Originally Posted by wustydemo
What is a injector buzz test and a cylinder contribution test and how do you do them?
You can do these two tests with a good scan tool, one that an automitive repair garage or dealership would have. Bascially what they do is... a buzz test tests whether the injector wiring and solinoid is working, and a contribution test tests how each cylinder is running. If an injector was 'bad' and not firing, chances are that it would fail a contribution test. If you had an injector unplugged or a bad wiring harnedd it would probably fail a buzz test and set the check engine light.