Why is my coil pack not working?

Sometimes low fuel pressure could be the culprit. However, most of the time this issue is due to the ignition system. Faulty ignition coils can affect the timing of when the spark plugs ignite, which causes misfiring and bad timing. Backfiring of the engine is a symptom of a bad coil pack.

What happens when there is no spark from the ignition coil?

1 Power. Two positions of the ignition switch provide power to the positive primary post of the ignition coil. 2 Signal. With no external signal to the coil negative primary post, voltage would travel through the ignition coil windings without inducing any secondary spark. 3 Flow. 4 Open Circuits. …

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.

What happens when you replace the coil wire on an engine?

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. The powerful spark will travel down the hollow hose to the distributor cap, but the engine will stall under any load because of the weakened spark.

What should the resistance of an ignition coil be?

Switch the meter’s resistance range to the 20K-ohm setting and attach the negative (black) meter lead to the center terminal of the coil. The reading here should be 11.00 or better, with 13.49 being about normal. 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.

What happens if there is no spark in the ignition coil?

Hence, without this high voltage, there is no spark and, consequently, internal combustion cannot take place within the engine. Simply put, the bottom line is without spark the engine doesn’t run.