Results 1 to 3 of 3

Thread: how to check RPM with no tach?

  1. #1
    Forum Newbie
    My Van(s):
    1984 auto
    Join Date
    Mar 2016
    Location
    so cal
    Posts
    7
    Rep Power
    0

    how to check RPM with no tach?

    Hello,

    I would like to check my idle rpm, sounds high by ear. Supposed to be 750rpm. My 1984 Auto 2WD van has no tach on the dash. I do have an rpm/dwell meter which normally would connect between ground and the coil however as you know in this distributor design the coil is not accessible when operating. Consulting the field manual shows a special test connector on the drivers side of the engine I believe. I cannot find this test connector. Is it with the other check engine connectors? Any ideas on where/how to check rpm would be greatly appreciated.

    By the way, I believe I have some type of issue as I've had to adjust my throttle body idle adjust screw ALL the way in. Van runs good but idle seems high, not excessively high but again I cant read rpms, I've checked for vacuum leaks and haven't found anything obvious to me. Now when I disconnect the vacuum line directly from the air intake below the throttle body before the Tee in the vacuum line and transition to tubing I get a nice drop in idle rpm. Any ideas?

    thank you very much!

  2. #2
    Administrator timsrv's Avatar
    My Van(s):
    Lots of them
    Join Date
    Jun 2010
    Location
    SW WA ST
    Posts
    6,202
    Rep Power
    10

    Re: how to check RPM with no tach?

    You'll need to hook up your tachometer to do accurately set timing. There's a search feature on every forum page (upper right). I typed in "tachometer" and found this right away:

    http://www.toyotavantech.com/forum/s...meter-question

  3. #3
    Forum Newbie
    My Van(s):
    1984 auto
    Join Date
    Mar 2016
    Location
    so cal
    Posts
    7
    Rep Power
    0

    Re: how to check RPM with no tach?

    Quote Originally Posted by timsrv View Post
    You'll need to hook up your tachometer to do accurately set timing. There's a search feature on every forum page (upper right). I typed in "tachometer" and found this right away:

    http://www.toyotavantech.com/forum/s...meter-question
    Thanks, I was searching under idle and rpm. That is what I needed.
    Since I'm just tuning and don't need a permanent tach I also went ahead and got an inductive meter from Harbor Freight Tools for $35 bucks.

    http://www.harborfreight.com/lcd-aut...kit-95670.html

    Its a multimeter also comes with a temperature probe and a nice plastic case so it's not a bad deal. I clamped the inductive pickup on to the Cyl 1 spark plug wire and was getting about 700 to 800 rpms so i'm good. Thanks!

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •