Shake Rattle and Roll

Discussion in 'Technical' started by Columbus Comet, Jun 28, 2009.

  1. Bob Wiken

    Bob Wiken Chronologically Gifted

    Joined:
    May 10, 2007
    Messages:
    1,592
    Likes Received:
    4
    Trophy Points:
    102
    Location:
    Fayetteville, Arkansas
    Vehicle:
    1973 maverick, '87 306 H.O., roller rockers C4
    Have you checked the motor mounts?
     
  2. Columbus Comet

    Columbus Comet Member

    Joined:
    Aug 9, 2006
    Messages:
    1,132
    Likes Received:
    37
    Trophy Points:
    0
    Location:
    Columbus, OH
    Vehicle:
    72 Comet GT,03 Cobra,06 Wide Glide
    Checked the motor mounts yesterday, everything fine.
     
  3. TonyS

    TonyS Member

    Joined:
    Dec 2, 2006
    Messages:
    61
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Ventura Ca.
    Vehicle:
    1972 maverick grabber
    :drive:Have you check the motor mounts for loose bolts?.

    I would hook a vacuum gauge up and run enough hose so you check while drive.
    1. Record idle vacuum at idle.
    2. Increase RPM until engine run smooth. Record RPM and vacuum reading.
    3. Disconnect distribute hose.Record timing at idle Leave the hose disconnect for the rest of the test.
    4. Set RPM to above, Record timing.
    5. Drive the car. Record the vacuum reading at cruise. Hold the speed for 5 minutes. Did the vacuum hold steady or did it jump around.?
    6. If your ride is a auto disconnect the trans vacuum line and repeat the test on the ride home.
    7. If the vacuum was nice and steady then I would bump the timing up and then reset the idle until you see the highest vacuum reading.
    8. let us know the vacuum reading.
     
    Last edited: Jun 30, 2009
  4. Columbus Comet

    Columbus Comet Member

    Joined:
    Aug 9, 2006
    Messages:
    1,132
    Likes Received:
    37
    Trophy Points:
    0
    Location:
    Columbus, OH
    Vehicle:
    72 Comet GT,03 Cobra,06 Wide Glide
    Where did I hook a vacuum guage? I have edelbrock performer 289.
    Thanks
     
  5. Earl Branham

    Earl Branham Certified Old Fart

    Joined:
    Mar 9, 2002
    Messages:
    6,367
    Likes Received:
    200
    Trophy Points:
    218
    Garage:
    1
    Location:
    Lugoff, SC
    Vehicle:
    '69.5 Maverick 302, T-5, Grabber Green
    One thing I forgot to mention. Check the vacuum shift modulator on the trans. See if the vacuum line is flattened, torn or off of the modulator. If the car smokes a bit (white smoke) the modulator could be bad, diaphram ripped open, and it will suck trans fluid into the engine. Also, it will appear as a vacuum leak to the engine. Give it a check.
     
  6. Columbus Comet

    Columbus Comet Member

    Joined:
    Aug 9, 2006
    Messages:
    1,132
    Likes Received:
    37
    Trophy Points:
    0
    Location:
    Columbus, OH
    Vehicle:
    72 Comet GT,03 Cobra,06 Wide Glide
    Thanks Earl, will check that out.
    Joe
     
  7. Mavman72

    Mavman72 Gone backwards but lookin' forward

    Joined:
    Apr 24, 2007
    Messages:
    6,759
    Likes Received:
    272
    Trophy Points:
    273
    Location:
    Buffalo N.Y.
    Vehicle:
    1972 Maverick 2 door.Original V-8 3 spd std shift.Also a 72 one owner Sprint sporting a 351 Windsor
    Check the vacuum reading.Hook it to the port on the carb.If the needle bounces around.You have a valve problem.Its sounds like you have a stuck valve or a valve actuation problem.May be time to pull the covers and have a look see.Good luck.
     
  8. Urban D Kaye

    Urban D Kaye Member

    Joined:
    Jan 31, 2008
    Messages:
    53
    Likes Received:
    1
    Trophy Points:
    0
    Location:
    PA
    Vehicle:
    1972 Maverick 4-door
    If it helps, my Ruby (72 Mav 4dr) just got a new vacuum modulator and she's like a different car. Much less shake & rattle, smoother idle, no hesitation off the line.
     
  9. radmav76

    radmav76 Member

    Joined:
    Feb 18, 2003
    Messages:
    110
    Likes Received:
    0
    Trophy Points:
    43
    Location:
    Toledo, Ohio
    Vehicle:
    1976 maverick soon to be 460 powered...project on hold.
    Make sure it's the port below the throttle blades for manifold vacuum. Any other port, like on the side of the carb, will not be manifold vacuum.
     

Share This Page