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?

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

3 Answers

  • Tiny
  • rivermikerat
  • Expert
  • 6,118 posts

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
  • 41,938 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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