Rpm go up and down

2004 FORD EXPEDITION
Avatar
LOLO
  • MEMBER
  • 4 POSTS
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!!
Dec 9, 2010 at 9:23 PM
Advertisement
Avatar
MHPAUTOS
  • CERTIFIED EXPERT
  • 31,937 POSTS
Do a scan for unresolved fault codes, this can be a faulty idle control motor problem.

Mark (mhpautos)
Dec 9, 2010 at 9:26 PM
Avatar
RASMATAZ
  • CERTIFIED EXPERT
  • 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.
Dec 9, 2010 at 9:26 PM
Advertisement
Avatar
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
Dec 17, 2010 at 6:46 PM
Avatar
RASMATAZ
  • CERTIFIED EXPERT
  • 75,992 POSTS
Did he hook-up a fuel pressure tester to determine his suspicion?
Dec 17, 2010 at 7:24 PM
Avatar
LOLO
  • MEMBER
  • 4 POSTS
he will be doing that today.
Dec 17, 2010 at 11:24 PM
Avatar
RASMATAZ
  • CERTIFIED EXPERT
  • 75,992 POSTS
Keep us posted
Dec 17, 2010 at 11:29 PM
Avatar
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
Dec 29, 2010 at 8:24 PM