FORD FOCUS 2000 LX USED THE WRONG SPARK PLUG

  • Tiny
  • JessicaLauren
  • 2000 Ford Focus
  • 97,000 miles

A few days ago, I replaced the spark plug on my Ford Focus 2000 LX in a hurry. I accidentally used the wrong spark plug - I used a Motorcraft SP 478 instead of the SP 504. However, the descriptions on these two spark plug are identical. Would using the wrong plug be causing my engine to misfire?

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Monday, March 19th, 2012 AT 3:34 PM

3 Replies

  • Tiny
  • rivermikerat
  • Member

It could. What about the specs on the 2 plugs? Heat range, etc.

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Monday, March 19th, 2012 AT 5:27 PM
  • Tiny
  • rasmataz
  • Member

Yes, Big Time

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Monday, March 19th, 2012 AT 5:28 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,997 posts

Yes, if spark plugs specifications are not what is recommended, it can cause misfirings as the gapping and heat range could be different.

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Monday, March 19th, 2012 AT 5:29 PM

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