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Ford Focus 2000 LX used the wrong spark plug

Tiny
JESSICALAUREN
  • MEMBER
  • 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
  • MECHANIC
  • 6,110 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
  • MECHANIC
  • 75,992 POSTS
Yes, Big Time
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Monday, March 19th, 2012 AT 5:28 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 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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