If a misfiring cylinder is being tested with a spark tester, a likely cause is?

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Multiple Choice

If a misfiring cylinder is being tested with a spark tester, a likely cause is?

Explanation:
Using a spark tester helps you verify whether the ignition system is delivering a spark to the plug. If a cylinder is misfiring and the tester shows no spark or a weak spark, the fault is in the ignition circuit—most commonly the ignition coil (or coil pack) or the wiring to the coil or spark plug. Fuel delivery problems, like a faulty fuel pump, affect fuel supply rather than spark and won’t be diagnosed by a spark tester. Worn brake pads or low coolant don’t influence the ignition spark. So an ignition coil or wiring issue is the most likely cause when diagnosing a misfire with a spark tester.

Using a spark tester helps you verify whether the ignition system is delivering a spark to the plug. If a cylinder is misfiring and the tester shows no spark or a weak spark, the fault is in the ignition circuit—most commonly the ignition coil (or coil pack) or the wiring to the coil or spark plug. Fuel delivery problems, like a faulty fuel pump, affect fuel supply rather than spark and won’t be diagnosed by a spark tester. Worn brake pads or low coolant don’t influence the ignition spark. So an ignition coil or wiring issue is the most likely cause when diagnosing a misfire with a spark tester.

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