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Old Jun 27, 2011 | 08:17 PM
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Engine Shutting Off

Hi Guys;

i have a 1998 Expedition , which i love..

But Lately when i come back from the train it has turned of about 6 times. Mind you its only a 2.5 mile drive.. and today i cranked it up to see how it was doing and it was idling super rough.. when you throttle it up it smooths out then it turns off...

Help
 
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Old Jun 27, 2011 | 09:22 PM
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Originally Posted by bayous
when you throttle it up it smooths out then it turns off...
Turns off with the throttle up, or after it comes back down to idle?
 
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Old Jun 27, 2011 | 10:44 PM
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Back down to idle. And when idling. Real rough
 
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Old Jun 27, 2011 | 11:03 PM
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Start by checking for codes. Clean the IAC, MAF, and the throttle body, all easily accessible and that should help with the rough idle. What motor do you have?
 
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Old Jun 28, 2011 | 12:34 PM
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And check the PCV elbow for the famous vacuum leak!
 
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Old Jun 28, 2011 | 12:42 PM
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Originally Posted by pdqford
And check the PCV elbow for the famous vacuum leak!
Is the a schematic showing where that is located
 
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Old Jun 28, 2011 | 01:26 PM
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Originally Posted by bayous
Is the a schematic showing where that is located
No.

I don't think you indicated what engine you have. But basically, its around the back side of the intake manifold. IIRC, on the 4.6 its not visible, but you can find it by feel. Just follow the PCV hose from the right side valve cover and you should "feel" the elbow to see if its all soft and mushy (trademark term ) or colapsed.
 
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Old Jun 28, 2011 | 01:52 PM
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5.4 L 1998 4x4 Eddie Bauer Exepdition
 
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Old Jun 28, 2011 | 06:35 PM
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Originally Posted by bayous
Is the a schematic showing where that is located
No but there's a picture, it's in the red circle: https://www.ford-trucks.com/forums/1...ml#post9460693

If you have the 5.4L motor then clean the IAC as shown in this thread: https://www.ford-trucks.com/forums/9...4l-triton.html
 
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