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Thread: Rough idle

  1. #16
    Join Date
    May 2003
    Location
    Wichita Kansas
    Age
    39
    Posts
    585
    Quote Originally Posted by crownvic97 View Post
    Yes, I took it as an opportunity to upgrade however. You could pull just the driver side head and have the valve/valve seat repaired on 8 (assuming That’s the issue which is likely).

    I bought some 9 thread heads, had a valve job and some porting done to them, and basically replaced everything other than the shortblock. Still not done!
    Yeah I'm afraid this could snow ball into a big project lol
    2004 SB
    4.10's and a tune
    More to come

  2. #17
    Join Date
    Aug 2016
    Location
    Fillmore, CA.
    Posts
    102
    My 2003 Had a Ruff Idle. After Changing the plugs and Coils, Which were the Factory originals from 2003 BTW, There was no change. Got a Compression Test and it was #8.
    2003 Mercury Marauder- Stock with 223k miles.

    2000 Crown Victoria P73. Deep Wedge Wood Blue.
    SW longtube headers and high flow cats, magnaflow mufflers, 3.55 gears w/track lock, 70mm Aviator TB, PnP factory plenum, ADTR intake tube, 87 octaine tune by MO. Bilstein HD shocks, Mecto Rear control arms w/ watts link, Addco custom order 1.5 inch front sway bar (38mm), 1.25 inch rear bar 31.75mm (only 11 made).

  3. #18
    Join Date
    May 2003
    Location
    Wichita Kansas
    Age
    39
    Posts
    585
    Ran compression test today. Test was done with engine cold and each cylinder was cranked same amount of times. Sadly have an issue on #8. Numbers were

    #1-220
    #2-225
    #3-215
    #4-225
    #5-200
    #6-205
    #7-185
    #8-85
    2004 SB
    4.10's and a tune
    More to come

  4. #19
    Join Date
    Nov 2002
    Location
    St. John, IN
    Age
    45
    Posts
    14,251
    The valve seat dropped.

  5. #20
    Join Date
    Nov 2014
    Location
    KC
    Age
    48
    Posts
    3,511
    Dont buy other heads, get yours freshened and have them install 8 time zert fittings to get the same advantage the 9 thread heads have.

    8 time zerts installed is wayyyy cheaper than buying some other heads.

    Other than the labor involved, this is a common repair.

    Good luck!
    The twins2.3 whipple/aluminatorVortech V-2 lots of goodies

    Current marauders
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