* Misfire: This is the most common cause. A misfire occurs when one or more cylinders aren't igniting properly. This can be caused by a number of things including:
* Spark plugs: Worn, fouled, or damaged spark plugs are a frequent cause.
* Ignition coils: These deliver the spark to the spark plugs. A failing coil will cause a misfire in the cylinder it's connected to.
* Worn or damaged wires: Worn or damaged ignition wires can prevent proper spark delivery.
* Fuel injectors: A clogged or faulty injector can prevent proper fuel delivery to a cylinder.
* Low fuel pressure: Problems with the fuel pump or fuel filter can lead to insufficient fuel pressure.
* Other potential issues (less likely, but possible):
* Crankshaft sensor: A faulty crankshaft position sensor can prevent the engine from timing the ignition correctly.
* Camshaft sensor: Similar to the crankshaft sensor, a problem here disrupts engine timing.
* Throttle position sensor: A faulty sensor can lead to erratic engine operation.
* Mass airflow sensor (MAF): This sensor measures the amount of air entering the engine. A bad sensor can lead to a lean or rich fuel mixture, causing misfires and shaking.
What you should NOT do:
* Ignore it: Continuing to drive with a blinking check engine light and shaking could cause serious and expensive engine damage.
What you SHOULD do:
1. Pull over safely: Find a safe location to stop driving immediately.
2. Have it towed: Do not attempt to drive the Jeep further. Towing is recommended to prevent further damage.
3. Get the diagnostic trouble codes (DTCs) read: A mechanic or auto parts store can use an OBD-II scanner to read the codes stored by the computer. These codes will help pinpoint the exact problem. This is the *most crucial* step. The codes will narrow down the possibilities greatly.
4. Repair the identified problem: Once the codes are read and the problem is identified, a mechanic can make the necessary repairs.
The shaking and blinking light together strongly suggest a potentially damaging problem. Don't delay getting it checked out. The cost of repairs will likely be much lower if you address it promptly than if you wait and cause further engine damage.
