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Re: 01 LeSabre misfire
From your description, it certainly sound like a seconday ignition misfire....you have changed plugs and wires(hopefully you used OEM plugs and checked the gaps....should be 0.060).....
While you changed coils, it doesn't sound like you checked spark output....need to do that one wire at a time with a spark tester attached.....this will test coil output....if bad output from a coil, swap coil with another.....if the spark output is the same for the same cylinder, bad ICM...if the misfire moved to another cylinder when you moved the coil, the coil is bad....
If spark is ok, and compression is ok, then we may have an injector problem.....if a noid light shows a pulse at #4 injector, it could be the injector....unfortunately, about the only thing you can do is an ohm check....if it is out of limits, then you need an injector....however if you have the same reading as other injectors, it proves nothing....it could still be bad....since no DIY'er has the equiptment to test the coil in the injector, or flow rate....about the only way to know for sure, would be to remove the rail and swap an injector.....if the misfire moves, you know it was the injector....
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