The S is a 24 valve double overhead cam
The U is an overhead valve,
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Strong language - - thatās why I am concerned.
I took the car back to the technician who hooked it up and assured me all cylinders were firing flawlessly. He had warned me in advance this problem might occur and said to trace it down would be costly and possibly futile. I took the risk and took it on a 1300 mile trip and, although the code persisted, the engine did not miss a spark. It continues to run flawlessly.