What are causes of no spark from the ignition coil?

What are causes of no spark from the ignition coil. Have changed the ignition module, ignition coil, the pickup coil in the distributer, ignition switch and still no spark at from the coil. Submitted: 11 years ago. Category: Ford What year is this truck? Do you have power at the + side of the coil with the key on?

What should spark reading be on ignition coil?

If your coil reads under 11.00, then chances are pretty good that this is the reason you’re not getting any spark or a very weak one. Replace the coil with a good quality new one, make sure you attach and tighten the leads correctly, plug in the top cable that goes to the distributor, turn the key and you should be good to go!

What are the symptoms of a bad ignition coil?

This may seem like a no brainer because the most obvious symptom of a bad ignition coil is a no start no spark condition, but here are a few other symptoms you’ll see along with no spark: None of the spark plugs will fire spark. The fuel pump will still work. The PCM will still activate the fuel injectors.

Can a spark plug be removed while the engine is running?

Keep in mind that on vehicles equipped with catalytic converters, any test that requires removal of a spark plug wire while the engine is running should be kept to a thirty second maximum. Any longer than this may damage the converter. In the event you are testing spark plug wires, do not pierce them.

How to troubleshoot a no start ignition coil?

How To Troubleshoot A No Start (Ford 4.9L, 5.0L, 5.8L). This may seem like a no brainer because the most obvious symptom of a bad ignition coil is a no start no spark condition, but here are a few other symptoms you’ll see along with no spark:

Why does my spark plug not connect to the distributor?

If you have an older stile distributor cap with female connections the coil to distributor wire will not connect directly to the spark plug tester, but this is not a problem as the wire can be replaced with one of the regular spark plug wires.

Can a bad spark plug cause an ignition failure?

More likely if your spark plug wires are going bad the motor will run but one or more cylinders will have a miss resulting from a reduction or lack of spark at the plug with the bad wire. There is one exception where a bad wire will cause complete ignition failure and that is the wire between the coil and the distributor.

Where does the Spark Go in the ignition coil?

Once the ignition coil gets this switching signal, it starts to spark away and as you’re already aware, this spark gets delivered to the center of the distributor cap by a high tension wire. From this point, the distributor rotor distributes the spark to the cylinders across the spark plug wires.

Can a bad ignition switch cause a car not to start?

However, if your car has ignition switch problems, you may not be able to start the car at all. Ignition switch problems can also cause issues on the road, such as unexpected shutdowns or electrical problems.

Is it possible to replace the ignition coil?

Normally, the high secondary voltage produced by an ignition coil is quite powerful. You can replace the secondary coil wire on an engine that uses one with an equal length of vacuum hose and the engine will start and run.

What should the voltage be on the ignition wire?

The voltage, measured at the coil’s + terminal, should be near battery voltage, or about +12.5 volts. If not, a wire can be run, on a temporary-only testing basis, directly from the battery’s + terminal to the red ignition module’s red wire. Do not leave this temporary wire attached for longer than a minute or so, while the engine is not running.

Why does my ignitor not work at low voltage?

most common reasons for an Ignitor not to work are low voltage or a bad ground (earth). If the red wire is connected to the coil + terminal the voltage there is usually reduced by a ballast resistor or a resistor wire from the ignition switch. Voltages over 7.5 V will fire

Why do I get less voltage at the coil?

Although, even without the resistor, you’ll get still more voltage at the coil since the new wire run is short compared to the wire from the ignition switch – less distance means less voltage drop.

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.

What happens if there is no ignition switch?

Without the key, the switch won’t move to the start or run positions, and will lock the steering wheel and gear selector. Of course, many cars made in the last 10 years or so have a push button instead of an ignition key and switch. With this design, the key fob sends a signal to the car’s computer saying it’s OK to start the vehicle.

How can I test the spark at the coil?

Using an Adjustable Ignition Spark Tester Test the ignition coil positive and negative side. 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.

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.

What kind of test is the ignition coil?

IGNITION COIL TEST 1: Testing For Spark With A Spark Tester. IGNITION COIL TEST 2: Testing For Spark Directly On Coil’s Tower. IGNITION COIL TEST 3: Verifying Ignition Coil Is Getting 12 Volts. Why The HEI Spark Tester. Where To Buy The Ignition Coil And Save.

What are causes of no spark from the ignition coil?