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Engine Knock Under Acceleration 700 1989

posted by  MilkDud on  Mon Oct 18 04:19 CST 2004
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last visit: Sat Sep 10 19:30 CST 2011
[RELATED]

Does anyone know what causes the engine knock/rattle sound when you are accelerating? I used to only hear it when using 87 octane fuel. After a few years it started knocking when using 89 but now I'm starting to hear it with 92 octane. The engine runs fine except for the knocking while accelerating. Is there a way to fix this?

Thanks for any advice.

D'Arda
--
1989 740GL (244K)








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    Engine Knock Under Acceleration 700 1989

    posted by  mcduck on  Mon Oct 18 05:05 CST 2004
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    last visit: Sun Sep 9 11:47 CST 2012
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    My guess would be that there's a buildup of carbon in your combustion chambers; this can be fixed by carefully feeding water(or some fancy proprietary solvent) into the intake while the engine's running. This is probably best left to a professional.
    --
    Jim McDonald








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      Engine Knock Under Acceleration 700 1989

      posted by  someone claiming to be jrroberson on  Mon Oct 18 08:33 CST 2004 [RELATED]

      Find some jobber in your area that has a motor vac unit, machine will hook up to your fuel delivery system at the fuel rails and cleanse the entire system.
      Fuel injectors,valves,combustion chambers and even your o2 sensor.
      Cost anywhere from 60 to a hundred bucks depending where yo are.
      Good Luck
      Poolman







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