Setting Ignition Timing with Vacuum Gauge...How?

Discussion in '60-Series Wagons' started by JLH911, Oct 23, 2007.

  1. JLH911

    JLH911

    Messages:
    2,360
    Location:
    So. Cal
    So How is this properly done? The same way one does it with a Timing Light? (removing the two hoses that go to the distributor)What's a good source of Vacuum in a 2F Motor?

    Thanks in advance (no pun intended!;))
  2. mmmahhmatt

    mmmahhmatt

    Messages:
    132
    a good source of vacuum is your intake manifold. brake booster is easy access. forget about that and use a timing light to set factory 7 btdc (the bb hole in flywheel) with vacuum PLUGGED to distributor.
  3. D'Animal

    D'Animal Rescuer of Beagle and Landcruisers Moderator

    Messages:
    20,704
    Location:
    Central California
    Why does the FSM say to warm up the engine and then disconnect the vacuum hoses from distributor, and plug both ends? Set the timing at 7 degrees at 950 RPM by adjusting the distibutor.

    Reference is from Toyota 2F Engine Emmision Control FSM # RM36043 page 4-2

    Grant backs it up here. http://forum.ih8mud.com/showthread.php?t=164993&highlight=setting timing
    Last edited: Oct 23, 2007
  4. grant5127

    grant5127

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    5,021
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    Meridian,TEXAS
    I've never had any luck setting the timing with a vacuum gauge.......Timing with a vacuum gauge will normally result in timing that is more advanced than what specifications call for.... Resulting in pinging under load or hard start " kick back" when cranking under hot conditions..... I basically just use the light and most seem to preform best @ 10/12* bftdc....
  5. Wile E Coyote

    Wile E Coyote Dave's not here! SILVER Star

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    3,110
    Location:
    Western AZ
    Timing w/ a light is best, in that it gives you a reference of just HOW far retarded/advanced you go.

    Timing w/ a vac gauge would mean simply advancing slowly unlill ya reach the highest # obtainable, then backing down just a hair, like a few degrees of distributor rotation only.
    Ultimately, they both rely on the drivability test to really decide where is best, they just arrive at the final setting differently and use less trial-and-error than just turn a little, and drive, then turn a little more and drive, etc.
    My spare $0.02
  6. jeffsclan

    jeffsclan

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    229
    Location:
    Sandy, UT
    How do ya know for sure how far advanced your are. I normally fun with the BB about halfway between the pointer and the bottom of the window. But how can I find out exactly what its at?
  7. grant5127

    grant5127

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    5,021
    Location:
    Meridian,TEXAS
    You will need a light with advance increment control....
  8. jeffsclan

    jeffsclan

    Messages:
    229
    Location:
    Sandy, UT
    Thanks, I'll look into getting one.

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