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1986 jeep Comanche makes a rattling sound when you try to start it?

Possible causes:

* Starter solenoid: The starter solenoid is responsible for engaging the starter motor with the flywheel. If the solenoid is faulty, it can cause a rattling sound when you try to start the engine.

* Starter motor: The starter motor is responsible for turning the engine over. If the starter motor is faulty, it can also cause a rattling sound when you try to start the engine.

* Flywheel: The flywheel is a large metal disk that is attached to the crankshaft. If the flywheel is damaged, it can also cause a rattling sound when you try to start the engine.

* Transmission: If the transmission is not properly engaged, it can also cause a rattling sound when you try to start the engine.

How to diagnose the problem:

1. Check the starter solenoid. The starter solenoid is located on the starter motor. It is a small, cylindrical device with two electrical terminals. To test the starter solenoid, you can use a multimeter to check for continuity between the two terminals. If there is no continuity, the solenoid is faulty and needs to be replaced.

2. Check the starter motor. The starter motor is located near the bottom of the engine. It is a large, cylindrical device with a heavy-duty electrical cable attached to it. To test the starter motor, you can use a multimeter to check for continuity between the positive terminal and the ground terminal. If there is no continuity, the starter motor is faulty and needs to be replaced.

3. Check the flywheel. The flywheel is located at the back of the engine. It is a large, metal disk with a ring gear around the edge. To check the flywheel, you can use a flashlight to look for any damage to the ring gear. If the ring gear is damaged, the flywheel will need to be replaced.

4. Check the transmission. The transmission is located between the engine and the driveshaft. It is a complex mechanical device that allows the engine to power the wheels. To check the transmission, you can shift through the gears while the engine is running. If you hear any grinding or whining noises, the transmission may be faulty and need to be repaired or replaced.

How to fix the problem:

The best way to fix a rattling sound when you try to start your engine is to identify the cause of the problem and replace the faulty part. If you are not comfortable doing this yourself, you can take your vehicle to a qualified mechanic.