When they get hot, the high voltage spark finds other paths to ground, causing random misfire. Who gives a crap about coil resistance? What kills these coils is heat. The test does not cover heat absorbed dielectric strentgh. I have a set of defective coil packs in my garage. Please read what I wrote about coil packs. These cars are so crappy that they can't handle a minor malfunction, it's like a chain reaction. The FIRST time your car stumbled or threw on the CEL, you SHOULD HAVE stopped driving the damn thing. The fact is that extended occurrence of misfire ruins the upstream cat. It is a pending code that only occasionally lights the CEL. I hate the car, I still owe on the car, I am a student with no money to fix or replace the car anymore but am looking at getting a loan to do so but am starting to feel that replacing the vehicle is my only option. Now almost a year and a half later and alot of money and work later it has hugely deteriorated, The engine light is always on solid, it has fits of no power and flashing that can last several minutes, it throws the codes at any speed even in idle it runs terribly and I only get about 300-400 km a tank. my problem used to be every couple weeks to months always at about 60 km/h it would lose power almost stall, the engine light would flash for a couple seconds it would suck a bit of gas, then it would go solid and run fine and the engine light would clear itself. It has been into multiple mazda and private shops plus I have worked on it myself. I have replaced the spark plugs, wires, 02 sensors x2, the ERG kit, catylictic converter, coil packs have been tested, ran many bottles of fuel injecotor cleaner though it. I have hadthese two codes on my 2002 mp5 since oct 2009 As long as I keep it over 70MPH or under 65MPH its fine. At 70MPH it kicks down no power with a few kicks of the gas pedal it kicks back in. After i replaced the pre-cat it ran fine for about 3 days then started to act up again. HHHHEEEELLLLPPPP!!!!!! I'm frigin losing my mind. Have spent endless amount of money to try and fix problem. Replaced Pre-cat(the one that bolts directly to the exhaust manifold. Trouble codes 1) P0421 - Warm up catalyst below threshold(bank 1) 2) P0300 - random/multiple cylinder misfire detected. HELP! I posted once before and have done everything I can think of nobody can seem to help me with problem.
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