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Thread: Heavy Knocking

  1. #1

    Heavy Knocking

    Here's the issue:
    Its a 58 Olds 88 with a 371 - rochester 4bbl. In park/nuetral the car will rev great with no apparent problems. Once in gear it will run OK for a couple miles. Then as you give it gas it start to knock very heavily, when you let off the gas and come back to idle it runs fine. Sounds like a timing problem under load. The centrifical advance mechanism appears to be fine as does the vacuum advance. Any ideas?

  2. #2
    Senior Member another old car's Avatar
    Join Date
    Dec 2001
    southside - tidewater area Va

    Re: Heavy Knocking

    this is just a guess , you didnt say how many miles on car
    if its a high mileage engine , you might need a timing chain
    is it a knocking sound or spark knock
    1971 Jeep CJ5
    1941 Olds Dynamic Cruiser

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