Question about 1999 Ford Expedition

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My check engine light came on yesterday, took my 99 expedition to parts store,code read misfire plug#3? How to fix?

Should i fix just that plug or should i replace them all?

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  • russell d gentry sr Feb 22, 2012

    I put the new coil #3 and replace all plugs, check light came on back on, this time coil #4, code#0354... it is right to diisconnect the battery cables during remo al & replacement?...

  • russell d gentry sr Feb 22, 2012

    Also the Exhaust gas recirculation circuit malfunction code#0403



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Depend on mileage on them. Personally I don't run plugs more than about 50-60K regardless of what the owner's manual says.

Pull plug three and see what it looks like: fouled (dark oily residue, bent electrode, etc. If electrodes seem worn from use and mileage, replace plug--you'll see scooped out area on outer electrode if excessively worn, clear code and see it it runs ok. If it codes again it could be a bad plug lead as well. If code returns then check out lead to plug or replace it. Plug 3 will be on the left bank of the engine third one from the front. Plug order is:


4 8
3 7
2 6
1 5


Firing order 1-3-7-2-6-5-4-8

Posted on Feb 21, 2012

Testimonial: "thanks, i will gi e it a try, lol, my 22nd letterof the alphabet does'nt ,work, ery greatful!!!!! "


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SOURCE: my 2003 ford expedition reads a code 305 cylinder

It sounds like a bad injector. Swap injector with another cylinder and see if code changes.

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SOURCE: Yesterday i charged my Battery


Thank you for contacting

You have definitely a starter problem in your car. Please find this helpful link to read the article related to your issue. I am sure it will help you troubleshooting your problem:-

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Posted on Jun 13, 2011

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