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low compression, burnt plug
Hey guy's I'm wondering how common a problem this is and what may be the root cause. Misfire codes on #'s 4&8. #8 spark plug is burnt off for 1/2 inch, compression good. #4 plug looks fine compression 75 lbs. This is a police vehicle with 68000 miles, plugs we... Login to read more. 
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| Engine | 5.4 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2006 Ford Expedition XLS 5.4L
| Engine | 5.4 L |
| Trans | 4-speed Automatic (Electronic) |
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