B250 3/4 Ton Van V8-318 5.2L VIN T FI (1992)
Break In Of "New" Engine
- Degrease, clean and reinstall the plugs.
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Excessive Valve Guide Clearance
- Repair engine as necessary.
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Worn Valve Seals
- Replace seals.
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White or Gray - Burned or Blistered Insulator
DESCRIPTION:
Burned or blistered insulator tips and badly eroded electrodes.
POSSIBLE CAUSE
ACTION
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Overheating
- Check the cooling system.
- Check for sticking heat riser valves.
- Check for lean air-fuel mixture
- Check the heat range of plugs. May be too hot.
- Check spark timing. May be too advanced.
- Check the torque value of the plugs to ensure good plug-engine seat contact.
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