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Old 11-28-2018, 04:27 AM   #51
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Have you confirmed the wiring is good to the sensor before replacing it? I read most the thread. I forget tho.

Use a labscope to see the output signal.
The wiring is intact, and I did do a resistance test for the three wires coming off of the distributor before removing it from the car. Each seemed to be OK.
A 'labscope'; is that like the 'banc d'allumeur souriau' that was mentioned by Kay in a previous posting above? I'm living in southwestern France (which explains the French spelling for what I believe is a 'Distributor tester'). I've been searching the internet for antique/vintage car clubs in the Toulouse area, where I live, but have yet to turn up anyone capable of testing my 30-yr-old Bosch distributor.
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Old 11-28-2018, 04:34 AM   #52
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The trigger star wheel on the magnetic trigger type come off with two screw drivers after you remove a clip. This isn't installed that way? You can use two small screwdrivers to gently lever the trigger wheel up and off the distributor shaft? After removing a retainer clip. That pin is very important but you usually just make sure you don't loose it. It's not keeping the wheel on the shaft in my experience. It's for locating the trigger wheel in the correct orientation.
I have found and removed the clip from above the trigger star wheel. A site recommended by Kay ( https://www.nomaallim.com/distributor-rebuild.html ) talks about a second clip under the wheel. I have been unable to locate it, to, as explained in that linked article, 'push it down' before removing the wheel.
I've tried prying up with screwdrivers, but that hasn't worked for me.
Thanks for your interest in my problem and struggle.
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Old 11-28-2018, 04:47 AM   #53
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Old 11-28-2018, 10:59 AM   #54
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This thread needs more Clean Flame Trap!

He developed a tester that was very neat for testing distributors at the junkyard. 9v battery, a LED, a beeper....
For testing Hall effect sensor.

This one is "impulse" sensor, I believe. I forget how it works i would have to look it up.

I know I could test it by measuring the output signal with an oscilloscope. It graphs the electrical waveform. A meter could also be used, but I like the visual.
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Old 11-28-2018, 12:23 PM   #55
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This thread needs more Clean Flame Trap!

He developed a tester that was very neat for testing distributors at the junkyard. 9v battery, a LED, a beeper....
For testing Hall effect sensor.

This one is "impulse" sensor, I believe. I forget how it works i would have to look it up.

I know I could test it by measuring the output signal with an oscilloscope. It graphs the electrical waveform. A meter could also be used, but I like the visual.
Thanks for your message, ZVOLV. That sounds like something that I could use.
Tom
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Old 11-28-2018, 01:34 PM   #56
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Here is my thread on how on how EZK works on LH 2.4

http://www.forums.turbobricks.com/sh...d.php?t=322395

Ok so I have re-read the thread. I have concluded you have a hall effect sensor.

Three wires. Power, ground, signal. Make sure you have power- you do. Make sure you have a good ground on the ground wire! Then finally, measure the signal out. I like to use a scope. Meters can also be used. At a bare minimum, make sure there is less than 2 ohms between the signal wire end-to-end.

I think you are on the right track. Its very possibly the sensor is bad based on your tests, but it's possible you didn't do it correctly.

Here is a hall effect sensor article I googled.

https://www.google.com/url?sa=t&sour...6z60ZjVQfxmkJv

Last edited by ZVOLV; 11-28-2018 at 04:13 PM..
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Old 11-28-2018, 05:58 PM   #57
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Default Hall Sensor Replacement

Yes, a Hall sensor distributor. Terminology is variable, but I associate "impulse" sensor with the reluctor and coil of the breakerless ignition, or even that of EZ116K with its crank sensor. This is TZ-28 I believe, and uses the Hall sensor. I've been staying out of the thread because I thought Dave had given the correct advice as I understand it. How the distributor was determined to need a new Hall sensor, I didn't follow, but often that's not so important. Changing the part is an easier task usually, but in this case I'd want to be damned sure because I'd probably bend up the trigger wheel (vane) if I tried this. Apparently Dave, I mean dl242gt, has done it and that's what we need. The voice of experience.

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Old 11-28-2018, 06:40 PM   #58
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Thanks for clarifying what I rwas referring to Art! I have only done this on the magnetic trigger for the older breakerless system we got on Kjet cars. But I knew the hall sensor setup in a Bosch distributor would be similar. You pry that trigger vane up and off and you have access to replace the hall sensor.

Last edited by dl242gt; 11-28-2018 at 06:41 PM.. Reason: change words.
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Old 11-29-2018, 01:24 AM   #59
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more Clean Flame Trap!...He developed a tester
It graphs the electrical waveform
Would this work?

Manual
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Old 11-29-2018, 04:18 AM   #60
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Ok so I have re-read the thread. I have concluded you have a hall effect sensor.

Three wires. Power, ground, signal. Make sure you have power- you do. Make sure you have a good ground on the ground wire! Then finally, measure the signal out. I like to use a scope. Meters can also be used. At a bare minimum, make sure there is less than 2 ohms between the signal wire end-to-end.

I think you are on the right track. It's very possibly the sensor is bad based on your tests, but it's possible you didn't do it correctly.
Thanks for having taken the time to re-read this sad-tale of a thread. I also appreciate the clear illustration posted by 'Clean Flame Trap' on removing the trigger wheel with a pair of 5mm round-shaft screwdrivers. I think that I'll try that before investing in the AutoWave waveform viewer that was also suggested (although I do believe that one can always use another tool, I've already exceeded my tool budget for 2018 :-).
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Old 11-29-2018, 10:23 AM   #61
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That's just a handheld scope. It eliminates the need for a laptop/desktop.

A meter can be used on the Hertz frequency setting to measure the output of a hall effect or crank sensor too. I just prefer the pretty image. On modern cars I just use the scan tool data. I'm invested $1,500 on personal scan tool equipment already for the stuff I do at the shop.

Clean flame trap: where is that picture of your homebrew hall effect sensor tester you made!? That may not be needed for the OP, but I'm curious.

OP. I would maybe go find a used dist and then test it with a meter set on Hertz AC setting. And do the same with your suspect one.
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Old 11-29-2018, 06:01 PM   #62
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That's just a handheld scope. It eliminates the need for a laptop/desktop.
It's a quick and coarse means to evaluate DC voltage and wave pattern, including CAN BUS signals.

FWIW, here's their catalog They have an updated model with 2 channels. And they have an adapter to examine Secondary Ignition wires and COP ignition systems
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Old 11-29-2018, 06:09 PM   #63
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Clean flame trap: where is that picture of your homebrew hall effect sensor tester you made!?
Here
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Old 11-30-2018, 03:35 AM   #64
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Nice...
If you make one for the European market, I'll get my deposit ready to get on the waiting list.
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Old 11-30-2018, 08:32 AM   #65
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You have my pics better indexed than I do. Thanks.
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Old 11-30-2018, 02:00 PM   #66
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Cleanflametrap, thank you. Very good and simple idea. I will copy this if you won't mind.
Cheers, Kay
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