Do you have to ground a spark plug to test it?
Do you have to ground a spark plug to test it?
Yes you should ground the spark plug. In your case the spark plug was close enough to the block to still jump the gap. If the plug was far enough away from metal nothing would have happened. On a separate note.
How can I find out if my engine ground circuit is bad?
There’s some unwanted resistance in the ground circuit. To locate the problem, continue with the next steps. Move your meter’s red lead to the main ground terminal, engine end side. Have your assistant crank the engine while you take a voltage drop reading.
How can I tell if my engine ground axle is bad?
Move your meter’s red lead to the main ground terminal, engine end side. Have your assistant crank the engine while you take a voltage drop reading. Repeat the previous two steps, moving your red lead to the terminal that connects the black, main ground, cable to the battery post.
What happens if the engine ground is bad?
The engine ground provides an electrical return path for the starter motor. A bad engine ground is a common problem leading to hard-starting and no-starting conditions. The following test takes a voltage drop reading to locate unwanted resistance in the engine ground path.
What happens when you have a bad electrical ground?
A bad electrical ground may affect one or more electrical systems because it forces current to search for other easy paths back to battery ground. This may cause all kinds of trouble for lights, sensors, modules and other electrical and electronic components. Often, bad grounds are relatively easy to diagnose and fix, usually in minutes.
What to do if there is no spark at the ignition coil?
Check for voltage output at the ignition coil. Disconnect the ignition coil wire from the distributor and install the spark tester to the wire and ground the tester to the engine. Crank the engine for a few seconds. If there’s spark, the problem is with the distributor cap or rotor.
How do you check a HEI ignition coil?
STEP TWO: Verify power supply to HEI. Disconnect the power wire to the ignition coil. If the coil is built into the distributor cap, this wire will plug into the cap, at the “BAT” or “B+” terminal. Probe the connector on the power wire with the test light, or use the voltmeter set to the lowest scale that accommodates 15 volts.
How can I tell if my ignition coil is on fire?
Have someone crank the engine and observe the center electrode of the plug — if there’s sufficient voltage reaching the plug, you should see a bright blue spark jump across the gap of the electrode every time that cylinder fires. If you see no spark, the coil is a good thing to suspect next.
Why is there no spark at the coil axle?
If there’s no voltage, check the wire between the ignition switch and the coil and, if necessary, the switch itself. If there’s voltage, the problem may be with the pickup unit. If the pickup is good, then the problem may be with the ignition control module.
