That’s a fully electronic igniter. If you’re running the stock electronic distributor, the Dwell is variable and determined by distributor at different RPMs. Try measuring your dwell at various RPMs.
You can read all about your distributor and ignitor here...
It’s amazing how often I rely on Coolerman’s website for technical details on our trucks. His contributions to the community are valuable and appreciated. I’d give him the noble prize for his FJ40 electrical knowledge 🍺….
I’m learning more about the mechanical advance /vacuum advance and the...
1) It’s ported on the base of the carb. I set RPM’s with the hose attached.
2) I do not have FSM for my non USA 2F distributor. I did get this info from dizzy faq…
Dizzy FAQ - http://www.globalsoftware-inc.com/coolerman/fj40/dizzyfaq.htm
Mechanical adv starts at 900 RPMs.
I went back one more time to adjust dwell to bring it closer to spec of 41 degrees (non USA). I decreased the gap to approx. .016 and I’m pleased with the results. My multimeter dwell angle is now showing 39.2 as shown. I then adjusted timing again and am running at 10 degrees BTC (at sea...
I need to buy a vintage tach/dwell to verify if the Innova is accurate….adjusted the points without the feeler gauge but used it after to verify gap size. Moved from .018 to .020.
I’m posting up an image of my old Non USA small cap distributor 19100-61010 (which is same as 19100-61080) to...
I was successful in measuring RPM by connecting the Innova 3340 to the ignition coil and ground. Red to the negative coil terminal and black to ground.
I could not justify the Fluke 78 multimeter…ended up buying Innova 3340 For $99. The unit came with the spark plug induction signal pick up. NOTE: The rpm fluctuated more wildly vs. my Innova 3568 timing light…
After more research, the igniter is what controls the coil so it will measure the...
@middlecalf …the engineer never even got far enough to hear me explain what my semi electronic igniter does. He immediately said there is an unfortunate known issue with dwell that will not provide accurate reading and to return it. In my view, they figure many customers will not try and...
@Grayscale …I just got off the phone with the electrical engineer at Performance Tool. There is a known issue with the W2972 digital automotive multimeter. It will not provide accurate dwell or tach.
Thanks for everyone’s help on this.
I‘m in search for a reliable multimeter that has tach...
Yes, @Grayscale that was my initial reason for posting. I thought the Ignitor circuitry was interfering with the multimeter signal. The Haynes hack is likely a good test for me should the ignitor every fail. Now I’m determined to get a dwell reading to see if I’m within spec. I’m including the...
Posting the 8/80 2F FSM Engine Repair Manual (pub. No. 36401E) details on Tach and Dwell. It says “some tachometers are not compatible with this ignition system”…it may be my new PT W2972 multimeter with tach and dwell…
Yes the $35 PT tool is not the best choice…I need to make the investment in a FLUKE multimeter. My Extech 430 works well but it did not measure dwell or tach. I connected the red to the negative coil post and black negative to chassis ground. No tach or dwell reading. I’ve got a call into the...
Yes @B y r o n I am running new points with new non USA OEM distributor.
This is how I’ve set it up the meter (per instructions). It provides no dwell reading or rpm. (The unit is off in photo).
It makes no sense to me how RPM can be measured without probe being connected to plug wire.
I’m not able to get dwell or RPM reading on my new multimeter (performance tool, W2972).
How to connect black (COM) and red test leads to my 89620-60010 coil/ignitor? The manual says to connect RED test lead to negative post on coil and the BLACK (COM) lead to ground.