Miata Turbo Forum - Boost cars, acquire cats.
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Miata Turbo Forum - Boost cars, acquire cats. (https://www.miataturbo.net/)
-   MEGAsquirt (https://www.miataturbo.net/megasquirt-18/)
-   -   Sync Loss Errors at 3500 at 3600 rpm (https://www.miataturbo.net/megasquirt-18/sync-loss-errors-3500-3600-rpm-96505/)

hustler 03-29-2018 11:44 AM
Originally Posted by 18psi (Post 1474560)
borrow known good one and test
I think I'll just go on a lunch ride on the bike instead.

Efini~FC3S 03-29-2018 11:45 AM
Originally Posted by hustler (Post 1474558)
how do I check a CKP if it's faulty when it seems to work well at low RPM rather than high?

Replace it with a known good one and see if the problem goes away?


EDIT: Whoops, Vlad beat me to it whilst I was taking my sweet time to respond

DNMakinson 03-29-2018 12:01 PM
Seriously, I had similar issues with, I think, the same vintage MS3-Basic. Is it the larger (longer) case version?

I fixed by adjusting the FW filters on the Crank Sensor. I can get you the settings I use when I get home this evening. Changing Sensors did not help. There are no pots to adjust, it uses optical isolation circuit, not VR circuit.

hustler 03-29-2018 12:18 PM
Originally Posted by DNMakinson (Post 1474571)
Seriously, I had similar issues with, I think, the same vintage MS3-Basic. Is it the larger (longer) case version?

I fixed by adjusting the FW filters on the Crank Sensor. I can get you the settings I use when I get home this evening. Changing Sensors did not help. There are no pots to adjust, it uses optical isolation circuit, not VR circuit.
Thanks.

DNMakinson 03-29-2018 04:53 PM
https://cimg6.ibsrv.net/gimg/www.mia...c4437b0ac5.png

hustler 03-29-2018 06:09 PM
Well new sensor and tried the filter with similar and more robust filtering, no dice, still have the same crap. Ugh.

DNMakinson 03-29-2018 09:02 PM
Wow. That’s all I have. Ian (Codrus) had a friend add some capacitors to his input circuits. I don’t recall the details.

hustler 03-30-2018 03:04 PM
Funny, when I switch-off the "check engine light" function, the car works fine. Turn it back on and I lose crank signal. Weird. Car works now.

Braineack 03-30-2018 06:13 PM
lol

hustler 03-30-2018 07:50 PM
Radiator fan works intermittently.

pdexta 04-02-2018 02:22 PM
Originally Posted by DNMakinson (Post 1474571)
Seriously, I had similar issues with, I think, the same vintage MS3-Basic. Is it the larger (longer) case version?

I fixed by adjusting the FW filters on the Crank Sensor. I can get you the settings I use when I get home this evening. Changing Sensors did not help. There are no pots to adjust, it uses optical isolation circuit, not VR circuit.
Stealing your filter settings fixed the issue with my 2000 with Brain Built MS3X. For me this is a new issue that just started showing up a month or so ago. I assume there's a physical issue with the sensor/wiring somewhere that's causing it, but the filter settings seem to have cured it for now. Thanks for sharing!

codrus 04-02-2018 02:35 PM
Originally Posted by DNMakinson (Post 1474674)
Wow. That’s all I have. Ian (Codrus) had a friend add some capacitors to his input circuits. I don’t recall the details.
We basically disconnected the MS3 HC11 inputs at the connector to the MSlabs board, built new filters, and then rerouted it to a pair of unused pins on the Mazda connector.

Post 98 in my build thread: https://www.miataturbo.net/build-thr...2/#post1206290

--Ian


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