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Not a Good Vibration ;-(

Discussion in 'The Hokey Ass Message Board' started by NITROFC, Jun 18, 2009.

  1. landseaandair
    Joined: Feb 23, 2009
    Posts: 4,476

    landseaandair
    Member
    from phoenix

    Does it idle smooth? Have you put a vacuum gauge on it. I might lean towards a bad plug or wire, but then again you said it got 20 MPG on your road trip.
     
  2. NITROFC
    Joined: Apr 17, 2001
    Posts: 6,175

    NITROFC
    BANNED

    Idles smooth around 500rpm ............:cool:

    I am not trying to drag this thread out just looking for a few clues ..Thanks
     
  3. James Maxwell
    Joined: May 6, 2006
    Posts: 549

    James Maxwell
    Member
    from So-Cal

    Avoid that RPM range and you're good to go! It will either go away or get worse, then and only then you'll know what gremlins are lurking.

    500 rpm idle, not too radical a cam in that one.
     
  4. landseaandair
    Joined: Feb 23, 2009
    Posts: 4,476

    landseaandair
    Member
    from phoenix

    One more idea before I call it quits, do you have vacuum advance? Is there any chance you connected it to a different port when the new carb was installed? The difference between ported and non ported vacuum may affect how the engine acts loaded at low RPM but I have to admit I have not had a lot of experience with it to be sure.
     
  5. Alternator? Water pump? P/S pump? A/C compressor? Belts deteriorated, delaminated, broken cord? Cracked pulley? Run it without the accessory belt(s) for a short time and see if anything changes.

    Rodents build a nest in the bellhousing during 4 years in storage?:confused:
     
  6. The old Potato in the tail-pipe trick !! >>>>.
     
  7. NITROFC
    Joined: Apr 17, 2001
    Posts: 6,175

    NITROFC
    BANNED

    After revewing all of this ..I have come to realization it mostly the carb and have been in contact with edelbrock to get a adjustment on the meter rods.
     
  8. Ryan
    Joined: Jan 2, 1995
    Posts: 20,994

    Ryan
    ADMINISTRATOR
    Staff Member

    If it's still there afterwards, unbolt the torque converter and slide it backwards... Then get in the car and rev and see what happens.
     
  9. I like the way this here Ryan guy thinks!:D
     
  10. Von Rigg Fink
    Joined: Jun 11, 2007
    Posts: 13,425

    Von Rigg Fink
    Member
    from Garage


    I was just headed there too..
    had this problem with my O/T dodge..ended up a torque converter issue
     
  11. RancheroMan
    Joined: Mar 31, 2006
    Posts: 260

    RancheroMan
    Member

    maybe the fan is a bit "off balance" at that rpm?
     
  12. Retro Jim
    Joined: May 27, 2007
    Posts: 3,859

    Retro Jim
    Member

    Now back to the carb , are all the vacuum line hooked up in their correct place and are any of the lines cracked ?
    Do you have a friend that has another carb that you can install to see if that is the problem ?
     
  13. NITROFC
    Joined: Apr 17, 2001
    Posts: 6,175

    NITROFC
    BANNED


    Now back to the carb , are all the vacuum line hooked up in their correct place and are any of the lines cracked ? YES

    Do you have a friend that has another carb that you can install to see if that is the problem ? NO
     
  14. Von Rigg Fink
    Joined: Jun 11, 2007
    Posts: 13,425

    Von Rigg Fink
    Member
    from Garage

    yes theres a cracked Vac. line..or yes they are hooked up right?
     
  15. NITROFC
    Joined: Apr 17, 2001
    Posts: 6,175

    NITROFC
    BANNED

    YES ..new Vac lines & YES .. hooked up correctly
     
  16. 36couper
    Joined: Nov 20, 2002
    Posts: 2,014

    36couper
    Member
    from ontario

    Is a 600cfm big enough for a big block? I always thought a 750cfm was better for a BBC.
     
  17. Belchfire8
    Joined: Sep 18, 2005
    Posts: 1,541

    Belchfire8
    Member

    Does it do it only in gear? is it still there when you are in park?
     
  18. I have seen engine rpm vibration problems with torque convertors, but typically the rpm range for that vibration would be at a higher rpm.
    Are your motor mounts stock rubber type or the "newer and better", harder urethane?
     
  19. NITROFC
    Joined: Apr 17, 2001
    Posts: 6,175

    NITROFC
    BANNED

    Both ...

    I have had another 600 on for years .. took a 750 off 7 yrs ago
     
  20. stealthcruiser
    Joined: Dec 24, 2002
    Posts: 3,748

    stealthcruiser
    Member

    Talk to us, Brother.................

    Did you find the culprit?
     
  21. drhotrodmd
    Joined: Nov 10, 2002
    Posts: 1,284

    drhotrodmd
    Member

    Does the car make any noise while driving it like a cracked flex plate?
     

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