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How does your car run? It sounds like it purrs but the bad timing reading is bothering you, as well it should. Just thinking off of the top of my head here, it sounds like you have a problem with the markings. 12degrees is way too far for the any computer to compensate for and your car shouldn't run well if at all, so it must be that your car is correctly timed but gives a bad timing reading.
With that in mind what are the possible culprits? 1) the harmonic balancer has slipped. But you took it off and put it back on again. Assuming, it wasn't in the wrong position and then you assumed that it was the correct position when you put it back on again, then that isn't the problem. 2) If you have a 230F engine in the car then you are measuring the timing by the little plastic shroud, make sure this has not slipped. I have heard of instances where the shroud had moved and people got readings like yours. 3) Are you measuring the timing with respect to cylander #1? Maybe you are measuring from the wrong wire.
The only reason I bring up the dummy checks is because I can't think of many reasons why you would get a wrong reading, there just isn't that much going on there. It seems like something simple must be overlooked.
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- Mike
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