A Bad Rotor Or Distributor Cap (cracks or carbon tracks that are allowing the spark to short to ground). Often the distributor cap is suspect. ... Consequently, it could short out the coil voltage and cause a faulty connection inside the terminal of the distributor cap . The result is a misfire in the spark plugs.
What if my ignition coil has power but no spark?
If the ignition coil does not have spark, it’s time to check its wires . Use a test light to check the continuity on the signal wire and power wire on the ignition coil. If both wires are functional but the coil fails to produce spark, the ignition coil or the ignition control module is bad.
What causes no spark from distributor?
Loss of spark is caused by anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. This includes worn, fouled or damaged spark plugs, bad plug wires or a cracked distributor cap.
How do you check the spark on a distributor?
If you don’t have spark at the plug lead, the next thing to check is whether you’re getting spark from the coil to the distributor. Pull the coil wire from the distributor and hold it near a ground . Again, have your assistant crank the engine and look for spark from the coil lead.
How do you fix a car with no spark?
If you do not see a spark, there is an ignition problem. Remove a plug wire and insert an old spark plug or a spark plug tester into the end of the wire (the plug boot). Place the spark plug on a metal surface on the engine, or ground the spark plug tester to the engine. Then crank the engine to check for a spark.
What are signs of a bad ignition coil?
- Engine misfires.
- Rough idle.
- A decrease in car power, especially in acceleration.
- Poor fuel economy.
- Difficulty starting the engine.
- Check engine light is on.
- Exhaust backfiring.
- Increased hydrocarbon emissions.
What would cause a coil not to fire?
There are a few reasons for no spark, new coil pack could be defective, crank sensor, ignition module or bad wire in primary circuit, faulty ECM/PCM . You may have to have a good technician have a look, diagnose and estimate repair. Second link gives detailed instructions for testing and diagnosing coil pack.
What causes no fuel and no spark?
If there is no spark or fuel, then the first thing I would do is check the vehicle’s fuses and relays , particularly the EFI main and ignition relays. It may be possible that one of these components has failed and is cutting off power to the vehicle’s ignition and fuel systems.
What causes weak spark?
If the spark is still weak after replacing the whole ignition system, then the normal size wiring or connector to the coil may be corroded or damaged somehow. The other real longshot is that the grounding strap between the engine/trans, body, and negative battery terminal is corroded/worn/damaged.
Can a camshaft sensor cause no spark?
If the camshaft position sensor is malfunctioning, the computer may not be able to determine the correct time to fire the ignition coils, and there may end up being no spark.
What are signs of a bad distributor?
- Engine misfires. Engine misfires can occur for a number of reasons. ...
- Car doesn’t start. ...
- Check Engine Light comes on. ...
- Excessive or unusual engine noises.
How do you test if your distributor is bad?
- Check the Distributer Cap. Often the distributor cap is suspect. ...
- Check the Contact Points. Inspect the condenser; the engine will not function if it is broken. ...
- Check the Arc. ...
- Tools and Materials.
- Crank the Engine. ...
- Remove the Old Distributor. ...
- Set the Point Gap. ...
- Set the Distributor.
Can you bypass a ignition Control Module?
To allow the ECU to take control of ignition timing it will “bypass” the ignitor and send the signal to the ECU for ignition timing processing. ... The ECU then sends a signal back to the ignitor with the ignition timing adjusted and then the ignitor module fires the coil.
Can off timing cause no spark?
If the timing belt slipped several teeth then the camshaft AND distributor rotor may both be retarded. If the rotor was too retarded then the coil can create the spark... but if the rotor isn’t on a dizzy cap terminal then you won’t get spark routed to the plug wire.
Can ignition switch cause no spark?
No spark is one of the most common causes of a no-start condition. It’s the first thing I check for. ... The igniter or ignition module, the pick up coil or crank sensor, the cam sensor, and the ignition switch are included.
