Testing the DI Cassette

Turn the Cassette over & put the plugs in the holes, ground each plug to the negative battery ***** and turn the engine over watching the spark. If there is a problem with the cassette, one of the plugs will have no spark or a very weak spark. Also, when you turn the ignition key off there should be a shower of sparks that runs the length of the plugs several times. There have been occasions when the DI cassettes would test ok when turned upside down but would fail when turned back over to install into the valve cover! Oil leakage from the individual coils of the cassettes have also been a problem. Oil leaks can be identified by noting that there is oil in the spark plug hole!
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