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2000 Ford Ranger Spark Plug

Tiny
LTMAGNUM
  • MEMBER
  • 2000 FORD RANGER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 135,000 MILES
I recently changed spark plugs and found that one had no electrode in it. After replacing the truck ran great for about 3 days. Engine codes say it is running too rich and too lean. Bought new O2 sensors to replace but decided to check the plugs and found the same plug with the electrode missing again. What causes this on a plug?
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Wednesday, March 5th, 2008 AT 7:30 AM

2 Replies

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Start with checking the codes in the pcm. Sounds like a lean issue is happening that may have resulted from a coil pack or pcm problem (updated for spark knock on both), possibble o2 sensors as you mentioned, bad MAF or Dirty MAF.

Hopefully you aren't going through coolant. Excessive sprk knock will casue headgaskets to fail from excessive heat.
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Wednesday, March 5th, 2008 AT 7:45 AM
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Is the tip of the plug bent at all?

Sounds like it could be excessive pressure and heat caused by spark knock, check your knock sensor to see if it is functioning then move onto o2 sensor related or a dirty MAF, IAT sensors.
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Wednesday, March 5th, 2008 AT 7:55 AM

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