Where is the engine control computer located on a 1998 Jeep Grand Cherokee 4.0l 4X4 automatic?

The Engine Control Module (ECM), often called the Engine Control Computer (ECC), in a 1998 Jeep Grand Cherokee 4.0L 4x4 automatic is typically located under the hood, near the firewall on the passenger side. It's usually a fairly sizable rectangular black box with numerous connectors.

However, the exact placement can vary slightly depending on options and specific build. It's best to:

1. Consult your owner's manual: This is the most reliable source. It should have a diagram showing the location of major components.

2. Look for a large black box with many wiring harnesses: If your owner's manual doesn't provide a diagram, carefully inspect the passenger side of the engine bay near the firewall.

3. Search online for pictures: Search for "1998 Jeep Grand Cherokee 4.0L ECM location" on Google Images. This can help you visually identify the component.

Caution: Be careful when working around the engine bay. Avoid touching hot surfaces and be mindful of moving parts. If you're not comfortable working on your vehicle yourself, it's best to take it to a qualified mechanic.