2003 Ford F-150 Problems: 1 Issues Every Owner Should Know
2003 model year · 1,523+ owner reports · Updated April 2026
According to Au7o's analysis of 1,523+ owner reports, the 2003 Ford F-150 has 1 documented known issues, with 1 rated critical. The most serious is Spark Plug Thread Blowout ($150-$500 repair). The most commonly reported issue is Spark Plug Thread Blowout with 1,523 owner reports. Across all issues, repair costs range from $150 to $500. DIY maintenance guides at au7o.io.
All 1 Known Issues
On the 1997-2003 Ford F-150, the aluminum cylinder heads on Triton V8 engines have only 4 threads for spark plugs instead of the standard 8-10. This can cause spark plugs to blow out of the head, damaging threads. Helicoil repair kits are available.
Common Symptoms
- Loud popping noise from engine
- Sudden loss of power
- Engine misfire on one cylinder
- Spark plug ejected from engine
How to Fix
If not yet blown out: Use anti-seize compound on spark plug threads, torque to spec (11-15 ft-lbs), and change plugs every 30k miles. If blown out: Install a Helicoil or Time-Sert thread repair kit ($50-150 DIY, $150-500 at shop). Preventive repair kits are also available to reinforce threads before failure.
What Owners Are Using
Parts and tips from 1,523+ owners who fixed this issue
- UpgradeInstall a Helicoil or Time-Sert thread repair kit
- TipDIY repairs can save significantly - dealer charges $50-150 but DIY costs are typically 50-70% less
- TipPreventive repair kits are also available to reinforce threads before failure.
- NoteThis is a high-severity issue - ignoring it can lead to costly repairs or safety concerns. Address it promptly.