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89 GM knocking sound when cold. What is it?

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    #1

    89 GM knocking sound when cold. What is it?

    I have an 89 Grand Marquis with 158,000 mi on it. The car runs excellent, burns no oil, and seems to have a normal amount of power for a 150hp 302.
    But I am getting this strange knocking sound on cold start up. It is not a lifter noise, and it doesn't sound like a rod. And it goes away after about 10 minutes of idling or 5 minutes of driving. I have heard of some vehicles having an issue with carbon buildup which in turn causes a knock (chevy 5.3 engines for example). Does anyone else have this problem or know what causes it?
    Tags: None
    #2
    Quite common for a LOPO 5.0. Just keep driving it, it will run forever like that.
    2020 Volvo XC90 T6 Momentum (Ice White / Blonde)
    2022 Ram 1500 4x4 5.7 Etorque, Built to Serve Edition, (Granite Crystal / Black)
    Past Panthers
    1989 Grand Marquis LS (Cabernet/Grey), 1989 Lincoln Town Car SS (White/Blue), 2004 Mercury Grand Marquis Ultimate (White/Black)

    Originally posted by Lincolnmania
    if its got tits or tires it's bound to give you trouble

    Comment

      #3
      +1 no worries. folks have put over 100K miles like that. Just keep the oil topped up.

      Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
      rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

      Originally posted by gadget73
      ... and it should all work like magic and unicorns and stuff.

      Originally posted by dmccaig
      Overhead, some poor bastards are flying in airplanes.

      Comment

        #4
        Mine's personally been (somewhere over) 10,000 km and to 100mph (and 5000rpm on occasion) while knocking. No worries, mon.

        85 4 door 351 Civi Crown Victoria - Summer daily driver, sleeper in the making, and wildly inappropriate autocross machine
        160KMs 600cfm holley, shorty headers, 2.5" catted exhaust, 255/295 tires, cop shocks, cop swaybars, underdrive pulley, 2.73L gears.
        waiting for install: 3.27's, Poly bushings, boxed rear arms, 2500 stall converter, ported e7's, etc

        06 Mazda 3 hatch 2.3L 5AT (winter beater that cost more than my summer car)

        Comment

          #5
          I had heard it was fairly common with these cars. And it really doesn't seem to get worse, I would really like to fix it someday though! From what I can tell, the car has been extremely well maintained. The oil is clean, it had all Ford tune up parts on it when I got it, which leads me to believe it was always serviced at Ford. Interior and exterior are near mint. I am stockpiling stuff for the HO swap.......One of these days it WILL happen!

          Comment

            #6
            The fix is a crank kit. The bearings get sloppy and the knock you hear is the play in the rod bearings before the oil pump starts developing pressure to float the rod off the bearings. The HO motors don't have this problem nearly as much. Its got something to do with the firing order not stressing the bearings towards the back of the motor as much. I forget the specifics, but the lopos knock even when taken care of, and HO's don't knock unless they've had the ever living hell beat out 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

            Everything looks like voodoo if you don't understand how it works

            Comment

              #7
              Both my 89s knocked. The MGM was beaten pretty hard (hey I was 17) and had over 100K. The Townie was babied its whole life and only had 70K on it.
              2020 Volvo XC90 T6 Momentum (Ice White / Blonde)
              2022 Ram 1500 4x4 5.7 Etorque, Built to Serve Edition, (Granite Crystal / Black)
              Past Panthers
              1989 Grand Marquis LS (Cabernet/Grey), 1989 Lincoln Town Car SS (White/Blue), 2004 Mercury Grand Marquis Ultimate (White/Black)

              Originally posted by Lincolnmania
              if its got tits or tires it's bound to give you trouble

              Comment

                #8
                my Mark with it's HO hums like it's brandy new... the 88 with it's lopo knocks pretty good until the oil pressure builds through the whole engine (a few minutes typically in the cold, 30 seconds tops warm)... both are driven like I mean it and neither show any signs of slowing.

                Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
                rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

                Originally posted by gadget73
                ... and it should all work like magic and unicorns and stuff.

                Originally posted by dmccaig
                Overhead, some poor bastards are flying in airplanes.

                Comment

                  #9
                  My 91 with 240K on it sounds like a 7.3 until it warms up.
                  My 87 with 95k on it actually was just as loud if not louder, but it had other issues.
                  Surprisingly my old 91 Grand Marq with 90k on it was always quiet as could be.
                  2020 F250 - 7.3 4x4 CCSB STX 3.55's - BAKFlip MX4
                  2005 Grand Marquis GS - Marauder sway bars, Marauder exhaust, KYB's
                  2003 Marauder - Trilogy # 8, JLT, kooks, 2.5" exhaust, 4.10's/31 spline, widened rear's, metco's, addco's, ridetech's 415hp/381tq
                  1987 Colony Park - 03+ frame swap, blown Gen II Coyote, 6R80, ridetechs, stainless works, absolute money pit. WIP

                  Comment

                    #10
                    I have 258,000 miles and it does that every time I start it. Been doing it for years.
                    89 CV LX 225/60 x 16 tires, CC819 rear springs, Front & rear sway bar, trans & PS cooler from 90 cop car. KYB shocks, F-150 on rear. Dual Exhaust w/ H pipe. Dark brown door panels, carpet, steering wheel, trim parts from a 87 Mer GM. Power front buckets from 96 Jeep Cherokee. LED'S front & rear. 3G Alt from a 97 Taurus wagon 3.0. Electric fan. Rear axle from a 97 PI 3.27 with disk brakes. Headlight relays.

                    Comment

                      #11
                      Could this also be the case on a 4.6? Mine started doing it on morning startup only and only it lasts for about 2 seconds.
                      '01 Mercury Grand Marquis GS 4.6L
                      '01 Ford Mustang GT 4.6L

                      Comment

                        #12
                        Timing chain tensioners most likely on a 4.6. They bleed down and the chain slaps. I don't know if thats actually a problem or not.
                        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

                        Everything looks like voodoo if you don't understand how it works

                        Comment

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