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RPM go up and down

Tiny
LOLO
  • MEMBER
  • 2004 FORD EXPEDITION
I recently got a check engine light on my 2004 Ford Expedition So my husband did a tune up the light went off for a day then the check engine light came back now the rpm 's go up and down when I park or im in a stop what can it be? HELPP!
Thursday, December 9th, 2010 AT 9:23 PM

7 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Do a scan for unresolved fault codes, this can be a faulty idle control motor problem.

Mark (mhpautos)
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Thursday, December 9th, 2010 AT 9:26 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Have the computer scanned for code/s-you have a problem within the engine management system that caused the CEL to turn on-This is your starting point of diagnosis, finding out what's going on.
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Thursday, December 9th, 2010 AT 9:26 PM
Tiny
LOLO
  • MEMBER
  • 4 POSTS
So the mechanic came to my house and check my truck well he read the code and he said that there might be a weak fuel pump. So know I wil be taking it to his shop and I will up date to see if its that or something else
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Friday, December 17th, 2010 AT 6:46 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Did he hook-up a fuel pressure tester to determine his suspicion?
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Friday, December 17th, 2010 AT 7:24 PM
Tiny
LOLO
  • MEMBER
  • 4 POSTS
He will be doing that today.
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Friday, December 17th, 2010 AT 11:24 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Keep us posted
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Friday, December 17th, 2010 AT 11:29 PM
Tiny
LOLO
  • MEMBER
  • 4 POSTS
Update:
Ok so they told me its the oxygen sensor one front and one rear with parts, labor and tax the total cost will be $385.12
Is that to much? I went online and the parts where way cheaper and it looks pretty easy to do
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Wednesday, December 29th, 2010 AT 8:24 PM

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