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My 04 Expedition is hard to start. Rough idle too

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My 04 Expedition is hard to start. Rough idle too .
Submitted: 11 months ago.Category: Ford
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Answered in 1 minute by:
10/4/2017
Ford Mechanic: Dan, Technician replied 11 months ago
Dan
Dan, Technician
Category: Ford
Satisfied Customers: 26,182
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Ford Mechanic: Dan, Technician replied 11 months ago

Is the check engine light on? If so, do you know what codes you are getting?

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Customer reply replied 11 months ago
No check engine light. No codes.
Customer reply replied 11 months ago
I forgot, new spark plugs and boots too.
Ford Mechanic: Dan, Technician replied 11 months ago

Does it seem to run better when hot or cold? Does it run rough both at idle and when going down the highway?

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Customer reply replied 11 months ago
Runs a little better hot. But not a whole lot better. rough only when idle. When driving typically fine. Sometimes I get a loss of power for a second or two and then the power comes back fully.
Ford Mechanic: Dan, Technician replied 11 months ago

Have you monitored fuel pressure?

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Customer reply replied 11 months ago
not since I got the new fuel pump.
Ford Mechanic: Dan, Technician replied 11 months ago

What engine do you have?

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Customer reply replied 11 months ago
4.8 L V-8
Ford Mechanic: Dan, Technician replied 11 months ago

How long has problem been going on? Have you checked for vacuum leaks?

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Customer reply replied 11 months ago
About 4 months. I've looked at my hoses but they look fine. I haven't done any more of an official test for vacuum leaks.
Ford Mechanic: Dan, Technician replied 11 months ago

Did problem slowly get worse or all happen at once? Have you checked fuel trims?

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Customer reply replied 11 months ago
all at once. One day car wouldn't start at all. Changed the battery and it started working but had the rough idle problem. Don't know what you mean regarding fuel trim.
Ford Mechanic: Dan, Technician replied 11 months ago

Fuel trim is something you would check with a scan tool. It is starting to sound like timing may have jumped, have you done a compression test?

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Customer reply replied 11 months ago
No compression test
Ford Mechanic: Dan, Technician replied 11 months ago

I would start there if one side of engine has noticeably higher/lower compression then the other then I suspect timing has jumped. Most other things would cause the check engine light to come on. Let me know how it goes or if you have more questions, thanks.

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Ford Mechanic: Dan, Technician replied 10 months ago

Ever get it figured out? Please do not forget to rate answer. Thanks.

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