How many ohms should a spark plug wire read?
Simply attach or hold a meter probe on each end of the cable and read the total resistance on the meter. The Society of Automotive Engineers suggests the maximum resistance should be 12,000 ohms-per-foot.
What is the resistance of a spark plug wire?
For copper core wires, the resistance will be 1 to 6500 ohms, inductive wires the resistance will be 2200 to 8000 ohms per 1 meter or 650 to 2500 ohms per foot and carbon wires, the resistance is 10000 to 23000 ohms per 1 meter or 3000 to 7000 ohms per foot.
How to check for a bad spark plug with an ohm meter?
Test for a Bad Spark Plug. Remove the ignition wire from the spark plug. Touch one meter lead to the terminal of the spark plug and the other lead to engine ground. Press the points of the meter leads firmly to the metal to ensure a good connection. If the meter reading is anything other than what you saw in Step 4, the plug is bad.
What to look for in a bad spark plug?
What to Look For. Be sure to first check spark plug wires for visual damage. Look for any signs of melting or cracking. The following situations call for immediate replacement of spark plug wires: Vibration damage – Constant wear and tear caused by engine vibration can loosen the electrical connection at the spark plug.
What can I use to test spark plug wire?
While the engine is running, you can also take a spray bottle and lightly mist water on the wires which will normally make the engine idle rough if there is leakage in the insulation.
Test for a Bad Spark Plug. Remove the ignition wire from the spark plug. Touch one meter lead to the terminal of the spark plug and the other lead to engine ground. Press the points of the meter leads firmly to the metal to ensure a good connection. If the meter reading is anything other than what you saw in Step 4, the plug is bad.
Can a spark plug be read by a tuner?
Being able to “read” a spark plug can be a valuable tuning aid. By examining the insulator firing nose color, an experienced engine tuner can determine a great deal about the engine’s overall operating condition.
How do you test a spark plug wire?
Test the wire from end to end with the leads of the meter. The lead colors do not matter for this test: one at one end, one at the other end. Note the reading. Lubricate inside the plug wire boot before installing it onto the spark plug.
What to Look For. Be sure to first check spark plug wires for visual damage. Look for any signs of melting or cracking. The following situations call for immediate replacement of spark plug wires: Vibration damage – Constant wear and tear caused by engine vibration can loosen the electrical connection at the spark plug.