Having problems with your 2003 Chevrolet Avalanche ?
Where are the spark plugs??? - 2003 Chevrolet Avalanche
Look in your engine compartment. Find where you fill the engine with oil, and look on the surface of the engine that it attaches to; you'll see the 4 coil packs for that side of the engine. You'll notice that each one has a large wire leading down to the side of the engine. Where this ends, is where the wire hooks up to the spark plug. The other 4 are on the opposite of the engine, exactly in the same place.
Repair Help & Product Troubleshooting for 2003 Chevrolet Avalanche
Tips for a great answer:- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.