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P0308 Fault Diagnosis for 2000 Lincoln Navigator: Common Causes and Fixes

Model: 2000 Lincoln Navigator Fault Code: P0308 Posted: 2006-10-25 21:54

Hello, I recently noticed my 2000 Lincoln Navigator starting to run roughly, with the engine light illuminating. After checking at AutoZone, I was given a P0308 diagnostic code. The technician mentioned this code is uncommon in Lincoln Navigators, but I'm unsure if that's accurate or just a general assumption. Since misfire codes are common in vehicles with spark plugs, I'm wondering what simple troubleshooting steps I should take before taking it to a professional? Any advice would be greatly appreciated. Navig8r

Related fault codes
P0308
Comments (3)
Anonymous 2006-10-26 06:05

Calling P0308 'unusual' in a Navigator is misleading. All vehicles with spark ignition systems can experience misfires. The 2000 Lincoln Navigator, especially the 5.4L Triton engine, is well-known for issues like fouled spark plugs, stripped plug threads, burned coil packs, and leaking intake gaskets. If you're relying on a parts store technician's advice without deeper diagnostics, you may be missing key root causes. A more thorough inspection is recommended.

Anonymous 2006-10-26 22:04

For your 2000 Lincoln Navigator, it's essential to use Ford-approved spark plugs—these are specifically designed for the vehicle and have historically addressed known issues with plug thread stripping in older models. I strongly advise against using generic brands like Autolite or Champion, as they've been linked to frequent failures in this engine platform. If your vehicle has surpassed 80,000 miles, a full tune-up is highly recommended. Additionally, verify that the powertrain control module (PCM) is properly commanding fuel injectors for cylinder 8. Check the coil pack for cylinder 8 for signs of damage or failure—this could be a primary cause of the P0308 code.

Anonymous 2006-10-27 08:31

I recently worked on a 1999 Lincoln 250 with a misfire in cylinder #7, which occurred just one month after the owner performed a DIY tune-up. The vehicle was equipped with NGK platinum spark plugs and ran poorly—after replacing both the coil pack and one spark plug, it started running smoothly again. This case highlights how even properly maintained engines can develop issues due to incompatible or worn components, especially in 5.4L Triton-powered vehicles.