My nephew tuned his car and designed an engine pass. Attempting to diagnose with a code reader just didn't work. He mentioned he has a CRP123E starter tool so I put it in and found it was misfiring on cylinder 4. Looking at this spark plug I found that there was NO GAP in it, it must have fallen and filled the gap. I overhauled the spark plug and fixed the misfires. After using his scanner I had to buy a CRP123X! It certainly helps to have this in someone's toolbox!
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