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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  • 9 Answers

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:

Back

4 8
3 7
2 6
1 5

Front

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: 2002 Ford Explorer V6 misfire

check for spark/fuel /vacuum -air leaks.....test plugs..then wires .and egr valve and snorkle and intake areas for air being introduced near each cylinder with carb cleaner wafted near then while idling

Posted on Mar 14, 2009

c1apton15
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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.

Posted on Mar 14, 2011

GodBlessU
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SOURCE: Yesterday i charged my Battery

Hi,


Thank you for contacting fixya.com.


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:-


http://newcarbuyingguide.com/index.php/news/main/3728/event=view


Please get back to us if you have further query else please accept the suggestion.


Posted on Jun 13, 2011

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