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    #1

    302 Rod Knock

    In the morning, no matter how warm/cold it gets, my '88 GM sounds like it's a diesel. I know about the rod knock sound on the higher mileage motors, but I've got about 110,000 on mine. It seems to get less evident when it warms up, but when it's cold and you fire it off...it's annoyingly loud. Sounds like the motor is on it/s last legs, although I know it isn't.

    The GM has been regulated to second car status after serving me well for 2 years; it leaks quite a bit of PS fluid from the pitman arm seal by the steering box (I have to fill up every 2 days), and the trans pan is also leaking like a sieve...I have to top it off once a week.

    I hate to get rid of the car since it runs fine and has good power...but the motor sounds like it's on it's deathbed when you fire it up cold, no matter the ambient temp...70n degrees outsside, or 20 degrees outside...

    I run 10W40 year round.

    Any thoughts on how to quiet it down, short of running 90W10 or rebuilding?
    sigpic
    1988 Grand Marquis LS (White Lightning), 2003 Mercury Marauder (SOLD),1979 Mercury Cougar XR-7
    http://landyachts.homestead.com/page5.html,1951 Merc on a '88 Lincoln Town Car Chassis:http://landyachts.homestead.com/index.html
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    #2
    my wifes 86 has same thing. sounds like a desiel till it warms up. the wifes has 150k with no issues but i did run a quart of lucas oil stabilizer and it seemed to quite it down but didnt go away. i even thought it was the rockers so i pulled the valve covers off thinking the valves need adjustment but they where all to spec.
    1984 mercury grand marquis ls rebuilt 306 flat top pistons with factory cfi and lincoln headers with single glasspack dual snorkle air cleaner. Gloss black paint with slick top coversion.
    1986 mercury grand marquis colony park 5.0 sefi dual exhuast thrush turbos with h pipe and turbines

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      #3
      It's the lopo knock. It will run sounding like that forever. Through some 15w-40 in it and forget about it.
      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

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        #4
        ive been running 20w 50 to quite the engine down and to slow the leaks.
        1984 mercury grand marquis ls rebuilt 306 flat top pistons with factory cfi and lincoln headers with single glasspack dual snorkle air cleaner. Gloss black paint with slick top coversion.
        1986 mercury grand marquis colony park 5.0 sefi dual exhuast thrush turbos with h pipe and turbines

        Comment

          #5
          Ignore it. Run 10w40 or maybe 15w40 and make sure the oil filter isnt a POC that drains back into the pan. Beyond that, it is what it is. They go like that forever. Once it gets to the point where the replace engine light is on more or less steady when driving, meaning you've got no oil pressure, you might ought to think about replacing the motor. Until then, keep driving.
          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

            #6
            my 88 sounds like a diesel even when warm... oil pressure is still good though and all the temps are right so meh.

            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

              #7
              Mine sounds like that half of the time and especially after I've changed the oil. (The new thinner oil makes it sound louder) On a new oil change; it's very loud... like a diesel, but it's not rod knock, it's piston slap. Ford undersized the aluminum pistons. They slap around in the bore more when the motors cold until the aluminum expands.

              I have 62,000 original miles. 55psi cold idle and 30psi hot idle in drive.

              Comment

                #8
                Originally posted by ford man View Post
                Mine sounds like that half of the time and especially after I've changed the oil. (The new thinner oil makes it sound louder) On a new oil change; it's very loud... like a diesel, but it's not rod knock, it's piston slap. Ford undersized the aluminum pistons. They slap around in the bore more when the motors cold until the aluminum expands.

                I have 62,000 original miles. 55psi cold idle and 30psi hot idle in drive.
                This!!

                and you couldn't blow the damn thing up if you tried.
                Give a man a fish and he will be fed for a day. Teach a man to fish and he will promptly forget that he once did not know, and proceed to call anyone who asks, a n00b and flame them on the boards for being stupid.

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                  #9
                  You can get a re-seal kit for the pitman arm for like $15. I just did one last weekend.

                  -ryan s.
                  08 Lincoln Navigator L - 233k
                  03 Mercury Marauder- 63k
                  97 Ford Crown Victoria HPP "Tank of Justice III" (TOJ3) - 194k -->578.9 miles on ONE tank of gas<--
                  94 BMW 325i Convertible - 135k
                  73 VW Super Beetle "Bunky" <----- Wifey's
                  12 Mini Cooper S - 90k <---- Wifey's
                  Originally posted by pantera77
                  Well my buddy tells him he knows exactly who loves buying shitboxes.

                  Comment

                    #10
                    mine sounded bad with 0psi oil pressure and kept going- outlasted everything else on the car. Actually I had 2 cars like that...
                    Builder/Owner of Badass Panther Wagons

                    Busy maintaining a fleet of Fords

                    Comment

                      #11
                      I had one down to 4 psi hot with 15w40 and a 80w90 blend in it. On a warm start it sounded like the crank was gonna fall out. My 89 has 300k some miles and no piston slap yet though. Just drive it.
                      1989 Grand Marquis LS
                      flat black, 650 double pumper, random cam, hei, stealth intake, Police front springs, Wagon rear, Police rear bar, wagon front ,exploder wheels, 205/60-15 fronts 275/60-15 rears, 1 5/8" headers, 2.5" offroad x pipe, Eclipse front bucket seats, Custom floor shifter, 4.10 gears, aluminum driveshaft and daily driven. 16.77@83mph

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