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1999 Ford Expedition missing on no 6 at low idle

Tiny
SUPER MOM
  • MEMBER
  • 1999 FORD EXPEDITION
  • V8
  • 2WD
  • AUTOMATIC
  • 67,000 MILES
Have put spark plugs and wires, coil, EGR valve clearned Egr valve, fuel filter air filter, Dphd sensor, air intake sensor, It still says missing on no 6
Thursday, April 9th, 2009 AT 7:53 AM

9 Replies

Tiny
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  • MECHANIC
  • 31,937 POSTS
Hi there,

Check the compression on that cylinder check for a vacuum leak around that cyl and check injector is ok, do this next.

Mark (mhpautos)
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Thursday, April 9th, 2009 AT 8:36 AM
Tiny
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I did replace the injector but not thr compresson
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Thursday, April 9th, 2009 AT 9:10 AM
Tiny
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Check the compression and check for vacuum leaks next,

Mark (mhpautos)
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Thursday, April 9th, 2009 AT 9:25 AM
Tiny
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The compression is ok, vaccum line ok, what else could it be? When you come to a stop and it idles it kicks back a little not all the time. We also put a MAF sensor.
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Monday, April 13th, 2009 AT 6:42 PM
Tiny
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Hi there,

you will need to get a read out of the actual Kva ignition readings when it misfires, this will prove the ignition system one way or the other, but if it is only 1 cyl, you may have to re check the ignition system for No 6 not just visually but with testing equipment this may now be a job for your mechanic, let me know if you need technical information, I will post what I can.

Mark (mhpautos)
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Monday, April 13th, 2009 AT 7:29 PM
Tiny
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I have took it to A Ford Dealer they can not find anything. So ford dealer mechanic is no good. I took it to them 5 times.
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Monday, April 13th, 2009 AT 7:41 PM
Tiny
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Hi there,

this may be a fault with in the ECU, I would talk to an independent work shop about trying a test unit( This is an ECU that has been confirmed that it has no defects) this will prove the ECU to be good or day, I would go here next.

Mark (mhpautos)
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Monday, April 13th, 2009 AT 7:51 PM
Tiny
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What is a ECU?
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Monday, April 13th, 2009 AT 8:24 PM
Tiny
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Hi there, this is the main computer that controls all engine management parameters.

Mark.
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Monday, April 13th, 2009 AT 9:05 PM

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