Rick's Free Auto Repair Advice

Posts Tagged: random misfires

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

Misfire Ford Windstar

Misfire Ford Windstar with the 3.8-litre engine This problem may be easier to diagnose than to repair. The exhaust gas recirculation (EGR) valve meters exhaust flow from the exhaust pipe to the intake manifold. From there, the exhaust flows through a small orifice at each individual intake port. Carbon buildup can block off these orifices. When that happens, the excess exhaust gas flows into other cylinders, causing misfires. To determine whether the misfires are EGR related, simply unplug the vacuum hose running to the EGR valve. Plug the vacuum hose … Read More


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