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    Loveboat now driveable and good power but...

    I've got the loveboat more or less straightened out. I reset the timing, this time with the spout connector out, to 10 degrees. Greatly improved power. Good acceleration. However, at low RPM with a load (uphill) in OD or high gear, there is a sputter even at steady rpm. I can't really hear it, but I can feel it. Like the engine is missing a little built, it's not a steady sputter. When the tranny kicks down and the motor spins up, it goes away. The condition worsens the longer the motor has run. (less bad cool, worse hot)

    I was thinking it was possibly pinging, so I retarded the timing to 9 degrees and put in a tank of 93 Octane gas.

    It is still there, and there is some roughness and missing to the idle once the engine is warm.

    My compression is about 165 in all the holes, which when divided by atmospheric pressure of 14.7 equals a compression ration of about 11.2:1.
    Pretty high.

    I'm thinking maybe with all the HO mods, the old 14 lb injectors can't keep up? Just a thought.

    To refresh anyone's memory, I did the HO conversion with the exception of the cam, injectors, and computer.

    The car is very driveable. I took it to PA and back (4 hours). I'm thinking maybe I should buy a Kirban adjustable fuel pressure regulator and bump up the pressure a little to feed the higher compression holes.
    1991 GM GS sedan "Love Boat" HO converted, Holley adjustable fpr, 3.27 Trac-lok - RIP
    1991 Colony Park LS "Wally World Express" HO, 3.27 trac-lok - RIP
    1988 grand marquis ls "grey ghoul" - RIP 1992 gm ls "superbeater"- sold 1993 F350 dually 7.3 IDI crew cab flatbed "killer" - RIP
    1994.5 F350 Dually Crew Cab Flatbed, Powerstroke 7.3 "overkill" - Alive and kicking
    1987 Lincoln Town Car "El Presidente" - Resting for winter, gonna be a beast!
    2008 Mustang, no name - belongs to the wifey

    #2
    The compression doesnt sound quite right....how far did you shave the heads and WHAT pistons are you running?

    If you have 11.2:1 ratio tho, it prob isnt too streetable...
    1983 Grand Marquis 2Dr Sedan "Mercules"
    Tremec TKO conversion, hydraulic clutch, HURST equipped!

    Comment


      #3
      I'd say so, lol
      Pebbles-1968 Ford F250
      Pile of Junk! An Electronics Project Site (To get wet by)<---Clicky! NEW STUFF!!!!

      Comment


        #4
        Stock E7's shaved 0.020". My compression gauge is an el cheapo Autozone deal, but it was consistent across all cyls. I'll throw it on the stock colony park motor for reference as a comparison.
        1991 GM GS sedan "Love Boat" HO converted, Holley adjustable fpr, 3.27 Trac-lok - RIP
        1991 Colony Park LS "Wally World Express" HO, 3.27 trac-lok - RIP
        1988 grand marquis ls "grey ghoul" - RIP 1992 gm ls "superbeater"- sold 1993 F350 dually 7.3 IDI crew cab flatbed "killer" - RIP
        1994.5 F350 Dually Crew Cab Flatbed, Powerstroke 7.3 "overkill" - Alive and kicking
        1987 Lincoln Town Car "El Presidente" - Resting for winter, gonna be a beast!
        2008 Mustang, no name - belongs to the wifey

        Comment


          #5
          Stock E7's shaved 0.020". My compression gauge is an el cheapo Autozone deal, but it was consistent across all cyls. I'll throw it on the stock colony park motor for reference as a comparison. Stock pistons. I too thought it was really high. I was expecting about 10:1 at most with the shaved heads.
          1991 GM GS sedan "Love Boat" HO converted, Holley adjustable fpr, 3.27 Trac-lok - RIP
          1991 Colony Park LS "Wally World Express" HO, 3.27 trac-lok - RIP
          1988 grand marquis ls "grey ghoul" - RIP 1992 gm ls "superbeater"- sold 1993 F350 dually 7.3 IDI crew cab flatbed "killer" - RIP
          1994.5 F350 Dually Crew Cab Flatbed, Powerstroke 7.3 "overkill" - Alive and kicking
          1987 Lincoln Town Car "El Presidente" - Resting for winter, gonna be a beast!
          2008 Mustang, no name - belongs to the wifey

          Comment


            #6
            Stock E7's shaved 0.020". My compression gauge is an el cheapo Autozone deal, but it was consistent across all cyls. I'll throw it on the stock colony park motor for reference as a comparison. Stock pistons. I too thought it was really high. I was expecting about 10:1 at most with the shaved heads.
            1991 GM GS sedan "Love Boat" HO converted, Holley adjustable fpr, 3.27 Trac-lok - RIP
            1991 Colony Park LS "Wally World Express" HO, 3.27 trac-lok - RIP
            1988 grand marquis ls "grey ghoul" - RIP 1992 gm ls "superbeater"- sold 1993 F350 dually 7.3 IDI crew cab flatbed "killer" - RIP
            1994.5 F350 Dually Crew Cab Flatbed, Powerstroke 7.3 "overkill" - Alive and kicking
            1987 Lincoln Town Car "El Presidente" - Resting for winter, gonna be a beast!
            2008 Mustang, no name - belongs to the wifey

            Comment


              #7
              If you suspect it to be the injectors take a look at your plugs to see if they are reading lean. I swapped out my 14lbers for some 19lb injectors because I thought the car was running lean after a head an intake swap as well. It had the same low rpm stumble. But I also think the improved air flow raised the powerband so you might need more rpm to get up those hills without the engine chugging.
              -Matt
              1968 Fairlane 500 - 1998 Camaro Z/28

              Comment


                #8
                unless you purposfully rebuilt the engine with high-comp pistons, there's no way you have that much compression...

                RIP Jason P Harril, we'll miss ya bro

                '80 Town Coupé
                '84 Towncar - Teh Cobra TC, 408w powered
                '16 Ram 1500 CC Outdoorsman, Hemi/3.92/8sp 4x4

                Comment


                  #9
                  I seriously doubt its a fuel issue.
                  I would suggest an adjustable fuel pressure regulator with the stock injectors before you try changing the injectors.

                  The very first thing I would do is ensure the tune up parts are new or like new condition. this includes cap, rotor, wires, plugs, t/stat, air filter, PCV valve, screen and grommet and dont forget about the fuel filter.

                  Also, what spark plugs are you using. you are aware the E7 heads take a different plug than the E6 head, right?

                  check the ECM For stored trouble codes and check for any obvious vacuum leaks.
                  2003 Town Car Signature - 3.27 RAR, Dual exhaust and J-mod - SOLD 9/2011
                  89 Crown Victoria LX HPP -- SOLD 9/2010
                  88 Grand Marquis LS - The Original -- Totaled 5/2006


                  I rebuild AOD/AODE/4R70W/4R75E transmissions....Check out my Facebook page: https://www.facebook.com/pages/North...48414635312478

                  Comment


                    #10
                    When my motor was doing that it was bad plug wires. Agree with all the above advice, but still not really sure you need a set of 19 lb injectors. I'd try that as a very last resort. When the intake was off, did you replace the O rings on the injectors? it could be a slight air leak around one of them.
                    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

                    Comment


                      #11
                      Yeah, I tried the holley adjustable fuel pressure regulator from summit, no change. The plugs were reading a little lean but no blistering or chipping, or aluminum speckles. The plugs, wires, rotor, cap, distributor, air filter, pcv screen, plug and valve, and distributor all brand new. I used the E7 spark plugs and gapped them to spec. I'm going to get a fuel pressure gauge. Maybe the fuel filter is partially plugged and needs replaced, but the odd thing is that I would expect that to cause trouble at high rpm. I'm only having the trouble at rough idle, and pinging under low rpm load. I'm going to gear up the rear, but I don't just want to hide the problem I intend to solve it. Could bad O2 sensors be the culprit?
                      1991 GM GS sedan "Love Boat" HO converted, Holley adjustable fpr, 3.27 Trac-lok - RIP
                      1991 Colony Park LS "Wally World Express" HO, 3.27 trac-lok - RIP
                      1988 grand marquis ls "grey ghoul" - RIP 1992 gm ls "superbeater"- sold 1993 F350 dually 7.3 IDI crew cab flatbed "killer" - RIP
                      1994.5 F350 Dually Crew Cab Flatbed, Powerstroke 7.3 "overkill" - Alive and kicking
                      1987 Lincoln Town Car "El Presidente" - Resting for winter, gonna be a beast!
                      2008 Mustang, no name - belongs to the wifey

                      Comment


                        #12
                        Possible, but the only real way to tell is with a code scanner. Are all the plugs evenly lean, or are some much more noticable than others? If its consistant, I'd probably say the whole fuel sys is running lean, if its not even than you have a vac leak someplace. If nothing cures it, go with the 19# and maybe tweak the pressure downward if that makes it run too rich.

                        Also, I hate to say this now, but disconnecting the vac line from the stock FPR would have bumped you about 10 psi, probably enough to tell you if an AFPR would be the solution. It wouldn't be a permanant solution as you'd lose your boost of pressure on acceleration tho.
                        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

                        Comment


                          #13
                          I also suggest that you check your TPS. Put an analog volt meter across it while you steadily advance the throttle. The needle should sweep across the dial smoothly. If you see any "spikes" or "dips" then I'd replace it.

                          Those "spikes" and "dips" are especialy noticable at low RPM's as a slight shudder or misfire.

                          -Paul

                          Comment


                            #14
                            Once again... you need to check the ECM for trouble codes and properly diagnose the problem, before you randomly guess and replace sensors and/or parts.
                            2003 Town Car Signature - 3.27 RAR, Dual exhaust and J-mod - SOLD 9/2011
                            89 Crown Victoria LX HPP -- SOLD 9/2010
                            88 Grand Marquis LS - The Original -- Totaled 5/2006


                            I rebuild AOD/AODE/4R70W/4R75E transmissions....Check out my Facebook page: https://www.facebook.com/pages/North...48414635312478

                            Comment


                              #15
                              Re: Loveboat now driveable and good power but...

                              Originally posted by matthew
                              My compression is about 165 in all the holes, which when divided by atmospheric pressure of 14.7 equals a compression ration of about 11.2:1.
                              Pretty high.
                              Stock 9:1 HO motors make about 150 psi cranking. 165 is not 11.2:1. Compression ratio and cranking compression are somewhat related, but I have never seen a formula that equates cranking psi to an actual compression ratio. Cam timing affects cranking psi. I have seen a rule of thumb that cranking compressions over 200 psi won't work with pump gas.

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