[fastfredracing]

This mornings victim. 2002 Honda Civic, 236,000 miles. Comes in with a missfire. He has had it at the dealer twice trying to chase this problem down. Both times, they did a leakdown, and compression check, and it has on their invoice that they checked for vacum leaks , and checked fuel injectors.
I pulled it in this morning expecting this to be a hard diagnosis. I trust no one, so I always do my own checks. Quick compression check shows 180 psi in all cylinders. Does not sound like a vacum leak, the #4 cylinder is totally dead. I listen , and can hear all 4 injectors working, and i have fuel on the plug for the dead cylinder. Check for spark output, and # 4 is not sparking. I am thinking surely that this will need a pcm, or have faulty wiring somehere, as there is no way the dealer could have missed something as simple as a faulty ignition coil twice. I switch coils from cyls #3 &4, and the miss moves with the coil.
New coil, done, runs like a Honda again.
This customer paid good money two times to have this missfire diagnosed, with no answer. It says on the invoice from Honda that they believe that bad gas could be the culprit.
This was the simplest of simple basic missfire diagnosis. WTF?