CUTS OUT WHEN AC IS ON GOT A MISFIRE CODE

  • Tiny
  • randy sharp
  • 2003 Ford Focus
  • 65,000 miles

I have posted this problem a number of times. If I have a misfire in cylinder 2. This is coil on plugs. Can I pull the wire on number 2 you know like you use to be able to do when a cylinder was cutting out pull a spark plug wire to see what cylinder is was. And I would like to know is how you test the injectors to see if it is bad?

Saturday, May 18th, 2013 AT 11:42 AM

4 Answers

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

Yes but first I would remove all the plugs and do a compression test. It is common for the valve seats to fail in these units causing the miss.

Check all plugs for wear as well. The fuel rail needs to be removed to watch the spray pattern of the injectors.

Roy

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Saturday, May 18th, 2013 AT 11:53 AM
  • Tiny
  • randy sharp
  • Member

This focus only has 66,000 on it I am not saying it couldn't happen. What kind of spray pattern should they have

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Saturday, May 18th, 2013 AT 12:07 PM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

A nice coneical pattern there will be one missing or way off if it is the issue

i have seen them at 50k with the valve seat issue

Roy

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Saturday, May 18th, 2013 AT 12:28 PM
  • Tiny
  • randy sharp
  • Member

I sure appreciate the advise, but why do you think it only does it when the AC is on?

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Saturday, May 18th, 2013 AT 6:32 PM

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