Spark plug wires ohm readings

Asked by Aug 20, 2016 at 11:37 AM about the 1996 Toyota Corolla Base

Question type: Maintenance & Repair

hey Peter fin I have a 1996 toyota corolla and I
have read my spark plug wires with an ohm meter
and it read my first spark plug wires at 1.33 and
the second one is 1.06 and the third is 0.89 and
fourth on 0.86 should I replace my spark plug
wires

2 Answers

105,485

Make sure the spark plug wire does not have an open circuit, and as a general rule, the resistance should not exceed 1,000 ohms per inch (but may be permissible by some O.E. manufacturers' specifications). To check, perform the following steps: Remove the spark plug wire from the engine. Using an ohmmeter, measure the resistance of the spark plug wire from terminal end to terminal end. If no reading is observed, the spark plug wire has an open circuit. Measure the length of the spark plug wire in inches. Divide the resistance reading by the length of the spark plug wire to determine ohms per inch. Right out of the book. The last time I say resistance this low was on a tractor that had solid core wires. Yes replace the plug wires.

2 of 2 people found this helpful.
55,415

If the wires are over 10 years old or have more than 100,000 miles on them I would replace them.

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