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Misfire testing
So apparently you don't count misfires with a knock sensor anymore, you make each cylinder misfire, then proceed to run at 2500 rpm for 5 mins while 4 cylinders are completely off then switch to the other side and do a bunch more on purpose misfires to try to see what the cause is. It'll tell you if it's a plug a coil or an injector though which is kinda neat but idk how great this is for longevity if you have to run more than a couple of these tests.
P.s. don't do this at your house, my neighbors hate me now and they're still stuck with 10 minutes of jackhammer noises
Best massage I've had in a while though with how the cars shaking.
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