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Mark 7 saga Part II

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    #1

    Mark 7 saga Part II

    OK.
    The new injectors are working great. Idle is smooth with no misses as before. Shifting into 3rd at low speeds chugs as expected at low rpm, but no kicking or missing. Gas mileage is way up. Good to go.

    Now.

    Not sure if it's a symptom of the HO upper or other issue.

    At cruise speeds I feel what can be described as a hard miss. Real quick, but very noticeable. Not consistent and not noticeable during acceleration.

    Also, when I let off of the gas the engine speed drops abruptly. almost like the engine shuts off, but it doesn't.

    I used the EGR and IAC off the HO. Could those be the problem?

    I used my new TPS and EGR sensors.

    And, The vacuum plumbing was different on my LOPO Manifold as opposed to the HO one. The HO has an additional vacuum source that is on the underside part of the upper that hangs out over the valve covers. I just plugged that and replicated the original LOPO vacuum routing.


    Thoughts?
    2000 Grand Marquis LS
    2000 F150 XLT 6 inches of lift.
    1987 Bill Blass Mark VII - Sold
    1985 Mercury Grand Marquis Colony Park- SOLD. to a little old lady
    Mercury Owners Group member
    Save The Whales, Restore an Old Station Wagon!!
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    #2
    use the egr and iac from your motor......the ho upper and sensors may have had 225,000 plus miles on it as one i saved was from a running 88 mk7 partscar

    1986 lincoln towncar signature series. 5.0 HO with thumper performance ported e7 heads, 1.7 roller rockers, warm air intake, 65mm throttle body, 1/2" intake spacer, ported intakes, 3.73 rear with trac lock, 98-02 front brake conversion, 92-97 rear disc conversion, 1" rear swaybar, 1 3/16" front swaybar, 16" wheels and tires, loud ass stereo system, badass cb, best time to date 15.94 at 87 mph. lots of mods in the works 221.8 rwhp 278 rwt
    2006 Lincoln Town Car Signature. Stock for now
    1989 Ford F-250 4x4 much much more to come, sefi converted so far.
    1986 Toyota pickup with LSC wheels and 225/60/16 tires.
    2008 Hyundai Elantra future Revcon toad
    1987 TriBurner and 1986 Alaska stokers keeping me warm. (and some pesky oil heat)

    please be patient, rebuilding an empire!

    Comment

      #3
      I have to get new gaskets, will swap this weekend.
      2000 Grand Marquis LS
      2000 F150 XLT 6 inches of lift.
      1987 Bill Blass Mark VII - Sold
      1985 Mercury Grand Marquis Colony Park- SOLD. to a little old lady
      Mercury Owners Group member
      Save The Whales, Restore an Old Station Wagon!!

      Comment

        #4
        The extra tee thing is part of the PCV plumbing. Not super important, and honestly it won't matter which way you run it. If you have the proper hoses, it won't hurt to hook it up, but if not you can just pull that tee out and put a pipe plug in there with some sealer to get rid of it.
        86 Lincoln Town Car (Galactica).
        5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

        91 Lincoln Mark VII LSC grandpa spec white and cranberry

        1984 Lincoln Continental TurboDiesel - rolls coal

        Originally posted by phayzer5
        I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

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