P0302 cylinder 2 misfire - Page 2 - Toyota Yaris Forums

IndestructibleYaris · 01-27-2022, 09:14 AM

Unless you do your own thorough diagnostics, I can't comment on another mechanic. Resistor type spark plugs were implemented after the dawn of electronic ignition around the 1990's. These resistors can go bad inside the spark plug leading to an open circuit that destroys the ignition coil. Your car could also be running horrible, thus destroying a good spark plug. Most mechanics are taught the wasteful technique of replacing systems rather than the individual component that has gone faulty among the group of otherwise perfect parts. This is done because most people do not understand diagnostics or the value of knowing the truth, and the experience of learning that comes with knowing the diagnostic truth.

You will never know the quality of a mechanic until you're more skilled than the man you're judging. Otherwise, you are just guessing. He knows tricks to diagnostics that you've never considered.

IndestructibleYaris · 01-27-2022, 09:18 AM

If you've removed the coils, then you're capable of diagnosing the spark plugs. The engine can run with the spark plug removed and the injector unplugged. Try a cylinder drop test with each component, and look and test the spark plugs. It's criminal to take the coils out and not take the spark plugs out for inspection

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01-27-2022, 09:14 AM	#19
IndestructibleYaris Drives: 2007 Toyota Yaris Sedan Join Date: Feb 2019 Location: Harrisburg, PA Posts: 142	Unless you do your own thorough diagnostics, I can't comment on another mechanic. Resistor type spark plugs were implemented after the dawn of electronic ignition around the 1990's. These resistors can go bad inside the spark plug leading to an open circuit that destroys the ignition coil. Your car could also be running horrible, thus destroying a good spark plug. Most mechanics are taught the wasteful technique of replacing systems rather than the individual component that has gone faulty among the group of otherwise perfect parts. This is done because most people do not understand diagnostics or the value of knowing the truth, and the experience of learning that comes with knowing the diagnostic truth. You will never know the quality of a mechanic until you're more skilled than the man you're judging. Otherwise, you are just guessing. He knows tricks to diagnostics that you've never considered.

01-27-2022, 09:18 AM	#20
IndestructibleYaris Drives: 2007 Toyota Yaris Sedan Join Date: Feb 2019 Location: Harrisburg, PA Posts: 142	If you've removed the coils, then you're capable of diagnosing the spark plugs. The engine can run with the spark plug removed and the injector unplugged. Try a cylinder drop test with each component, and look and test the spark plugs. It's criminal to take the coils out and not take the spark plugs out for inspection