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    #1

    new motor not right

    As you may recall, a new motor was recently installed in the '90 GM. Lopo 302 with E7 heads. It's been gone through quite thoroughly a few times, now, but still has a few issues which bother me.

    The shop that did the motor says it's mechanically sound and there should be no issue. I've replaced O2 sensors, IAC valve, and fan clutch since I've had the car back. The following issues still remain: 1. engine shudders at idle (in gear and in neutral); 2. engine temp is running around 205 deg. F. to 215 deg. F.; 3. I've adjusted the TV pressure, yet the car doesn't seem to have the "get up and go" that it should; 4. when I put my ear to the tail pipe, I can hear a slight "pthh" in a rhythmic pattern (when car is at idle).

    The shop is 120 miles away, so I'm not able to "just run it back" due to fuel costs. Anyone have any input on these issues? Is it possible that the Lopo cam and E7 heads don't agree with each other? I'm at my wits end with this car, and my mom is not happy with the rebuild. Seriously, it had more "pep" on the original Lopo with the horrible bottom-end knock.
    Tags: None
    #2
    a rebuilt motor or a used replacement motor?
    Scars are tatoos of the fearless

    Comment

      #3
      Sounds like timing or MAP sensor maybe? The cam and those heads should work fine together.

      If the timing is retarded far enough I think it would cause those issues.
      Builder/Owner of Badass Panther Wagons

      Busy maintaining a fleet of Fords

      Comment

        #4
        You can use E7 heads on a lopo motor with a lopo cam. It won't run funny. The only thing you have to do is use a 25 plug instead of the autolite 2545.

        Has the timing been verified? Have you checked vacuum? Compression test? It could be a weak cylinder or a valve not sealing properly. That should show up on a vacuuim and/or compression test.
        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

          #5
          I completely agree... sounds like a timing or tune issue.
          check the basic stuff, timing set correctly? correct spark plugs installed for the heads? check vaccum, check compression.
          its common to get the distributor off one tooth. the engine will start and run, but very badly, it will smooth out if you advance the hell out of the distributor (rotated until the TFI module hits the t-stat housing)

          could also be an exhaust issue, bad cat converter, clogged exhaust. could be like my dad and drop a couple bolts down the pipe while doing head gaskets on a 3.8L in my sisters Cougar.
          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

            #6
            Rebuilt motor, not used. When I took the car back the first time (faulty plug wire and rusted emissions pipe were the problems), they did compression tests and checked plug gap. They even tried a different MAP sensor with no change in the car's behavior. Heads were vacuum tested for proper sealing before installation. I checked the timing the first time we brought it home and it was dead on 10 deg TDC.

            I spoke with the guy at the shop today, and he said he noticed the things I mentioned. The car runs fine, except for the shudder at idle. He said it's acting as if it's running a hair lean at idle. Give it the tiniest amount of gas, and the shudder seems to go away. Mom came home today and said it drove great down the interstate. I'm wondering if the weather plays a roll in some of this. It ran hotter (more towards 215 deg. F.) on the day it was hot and very high humidity.

            The O2 sensors I pulled out didn't look all that bad for 72K miles. The car does need cat-back duals or a whole new system. When you step on the gas, it sounds exactly the way S.U. did before I started trying different dual exhaust set-ups ... like the car is suffocating. However, that doesn't explain the shudder.

            I don't doubt this shop's work, they are good people with a good reputation, I'm just trying to figure this stuff out 'cause the little things bug the hell out of me.

            Comment

              #7
              Try calling up the head mechanic and talking with him and be sure to mention what was talked about here. perhaps picking his brain and you do the work might solve the problem.
              I had to do this for my cousin before, I had to help him tune his carburettor and he is in another state!
              YouTube. FaceBook Crown Vic Group

              Comment

                #8
                Originally posted by capridrifter View Post
                Try calling up the head mechanic and talking with him and be sure to mention what was talked about here. perhaps picking his brain and you do the work might solve the problem.
                I had to do this for my cousin before, I had to help him tune his carburettor and he is in another state!
                This is the head honcho I'm dealing with. He built the heads for this motor.

                Comment

                  #9
                  Oh........
                  YouTube. FaceBook Crown Vic Group

                  Comment

                    #10
                    Probably a tiny vacuum leak or something queer like that.
                    Chris - A 20th Century Man \m/ ^.^ \m/

                    Comment

                      #11
                      What spark plugs are in the heads?
                      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

                        #12
                        Originally posted by gadget73 View Post
                        What spark plugs are in the heads?
                        Motorcraft SP409, so says the receipt for the motor.

                        Comment

                          #13
                          those the WRONG spark plugs for E7 heads.

                          correct plug should be an autolite 25 or motorcraft SP450.
                          use a Mustang or HO mark 7 application for looking up spark plugs.
                          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

                            #14
                            Originally posted by 88grandmarq View Post
                            those the WRONG spark plugs for E7 heads.

                            correct plug should be an autolite 25 or motorcraft SP450.
                            use a Mustang or HO mark 7 application for looking up spark plugs.
                            I'll grab a set tomorrow and change 'em a.s.a.p. Thanks, man.

                            Comment

                              #15
                              yep, those are plugs for the E6 head. That might be the whole problem.
                              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

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