Posts Tagged: engine misfire diagnostics.

Random Misfires — How to diagnose and fix

How to diagnose random misfires The #1 cause of random misfires is worn, faulty, improperly installed or incorrect spark plugs If you’ve recently installed new spark plugs and are now getting a P0300 with random misfires, and you didn’t use a torque wrench to install the new plugs, that may be the cause. Or you may have installed the wrong heat range plug or the wrong type of plug. If you’re overdue for spark plug replacement and are now getting a random misfire P0300 code, that’s a sign you’re due … Read More