MYSTERY ENGINE MISS

  • Tiny
  • martinrobertcairns
  • 1998 Ford F-150
  • 170,000 miles

I have a 98 f150 2 wheel drive standard with a 4.6 the engine has a miss and when I put it on the scanner it comes up with a miss on cyl#4 I have replaced the fuel injector the plug the wires and the coils on the engine but it still has a miss. I have checked for vacuum leaks and found none. I am at a lose as to what else it could be. Can you help me please?

Friday, September 14th, 2012 AT 11:58 AM

3 Answers

  • Tiny
  • KHLow2008
  • Expert
  • 41,976 posts

Check its compression to see if it varies with other cylinders.

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Friday, September 14th, 2012 AT 11:59 AM
  • Tiny
  • martinrobertcairns
  • Member

I did a compression test and cyl #2, 3, 4 were 165 and the rest were 155.

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Saturday, September 15th, 2012 AT 12:24 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,976 posts

Compression results seems ok.

Have you checked the EGR functions and operations?

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Saturday, September 15th, 2012 AT 6:24 PM

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