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2007+ Expedition & Navigator 2007, 2008, 2009 and 2010 Ford Expedition and Lincoln Navigator

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Old 11-06-2011, 09:58 AM
ShawnV ShawnV is offline
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2008 Expy transmission studders at 45mhp every time

I'm trying to help a friend resolve her issue with her 08 expedition. When driving the truck will studder right at 44-45mhp every time. If going up a hill it will slam, if on flat ground it will studder and if going downhill it's less noticeable.

She took it to the dealership and had them exchange the fluid and they don't know what it could be.

The truck has 125k on it and is otherwise in great shape.

thanks,
shawn
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Old 11-06-2011, 01:24 PM
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RI-Matt RI-Matt is offline
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Plugs and/or coils.
With 125K on it have they ever been changed? At 40-45mph the motor is under a good deal of load so it tends to show a coil or plug that is weak.

HTH
Matt
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Old 11-06-2011, 05:55 PM
ShawnV ShawnV is offline
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They have not been changed. I was trying to get her to change them back in April....

shawn
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Old 11-06-2011, 08:36 PM
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I'd have her do the basic maintenance first. Then look for problems.
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Old 11-06-2011, 08:36 PM
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