Identifying and Fixing GMC Envoy Ignition Coil Problems
For vehicles, everything begins with a spark. This spark is powered by the ignition coil, and when the ignition coil fails, the journey cannot even begin. This reduces the impressive GMC Envoy into a massive box in your garage. Ignition coils play a vital role in your engine performance, which is why, as an owner, you should familiarize yourself with its operations and its possible failings. Here are some ways on how to diagnose GMC Envoy ignition coil issues and what you can do about them.
Engine won't start
After a rainy night, you find that your GMC Envoy refuses to start. This could mean that the cylinders of your ignition coils may have cracked and moisture seeped into it. Check the coil pack, if you confirm that moisture has come in contact with your ignition coils then take them out and dry them. Clean the ignition coil packs as well and make sure that you dry them completely afterwards. If the ignition coil only has a hairline crack then you should be able to start the car. However, the crack will cause your vehicle to stall in the future as the crack disrupts the coil's ability to power sparks.
Ignition coil related stalling can be hot or cold and both cases will leave you stuck on the side of the road. Hot stalling is a result of hairline fracture on one of the coil's windings. Normally, ignition coils can take the high temperatures that the engine produces. However, this resistance decreases with a bad coil. So as the heat expands the bad coil, the gap from the crack disrupts the connection, and power fails to reach its destination. You can temporarily fix this by allowing the engine to cool off for a few minutes before starting again. On the other hand, if you stall when the temperature's low, like when it's raining or snowing, then it means that moisture has gotten into your ignition coils. This results in a weak spark. When the spark is not powerful enough to make the engine run, your vehicle stalls. Try restarting your engine and let it idle, before continuing your drive, this allows the coils to warm up.
Misfires and noise
When accelerating on the road, you suddenly find your engine hesitating. This is then followed by the sounds of your engine coughing, and the feel of your engine jerking. This means that your ignition coils are producing weak sparks that is underwhelming your engine. Even if the vehicle doesn't stall, make it a point to stop anyway. Turn off the engine then try restarting it. Better make sure that you check under the hood when you get home though. Misfires are common in old engines, but sometimes, it could mean that one of your ignition coils need replacing.