Sync Loss Errors at 3500
 

Does this look like a crank sensor alignment issue or something else? I only get the issue at ~3500 rpm. The 99 crank sensor is a credit-card thickness from the tooth, maybe I need to pick up new feelers since the old ones were lost int he move. I'm guessing the swap between going high and low tells the story.
https://www.miataturbo.net/attachmen...1&d=1522102967
Thanks for the help.

OP is a caring lover, 10/10 would hire again

Did you get lost? This is not the cycling section.

[Insert Mel Gibson quote here]

:rofl:

Does it happen both when warm and cold?

Not to threadjack, but I've been having intermittent sync loss on my 2000 miata when the car is cold (below ~70c water temp). Does the car being cool indicate a specific issue?

It seems like it usually happens under light acceleration and I typically get somewhere between none and 5 counts until the car warms up. I keep messing with the crank sensor gap without any luck.

Yes. I remember previously that fouled plugs would whack-out the tach on a 1.6, but I believe I now have the tach driven from the CKP. Regardless, I'm changing plugs today, measuring gap on the CKP tomorrow and putting it at .030". I don't know what causes the logger to swap from high to low like that.

Are the pots adjusted correctly? And space the sensor with a business card. That's close enough.

Pits? Arm pits? Like your av?

I've done the credit card adjustment, no deal.

he meant to say pots. the pots inside the ms. he might be right. doesn't sound like it's a spacing issue, so either it's the unit, the sensor, or the wiring.

id check wiring and pots adjustment first (free)
then replace the sensor

Thanks a ton. I should note I had no problems before the car sat four years, but open to trying anything at this point.

Yes pots. What kind of megasquirt is it? If it's an mslabs unit then nvm.

I've got a spare sensor or 2 I could loan you. Would just want it replaced if it fixes it.

this is hustler you're talking to. ms labs was still swimming in rev's loins when he built this thing ;)

Yep, ~2012 MSLabs MS3. Thanks for the offer but I think there is a spare sensor somewhere, in some box, from the move. I'm sure it's something super simple I overlooked. I can't remember most of what I need to from so long ago now that I'm a spandex clad bike saddle sniffer.

Maybe @Matt Cramer or @Ben might have some insight on why the logger flipped like that.

OMG!
The prodigal son hath returned.

In most cases, it's sensor failure.

Okay, sensor is .030" from crank teefers and I still have the same log, how do I check a CKP if it's faulty when it seems to work well at low RPM rather than high?

borrow known good one and test

I think I'll just go on a lunch ride on the bike instead.

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.

Well new sensor and tried the filter with similar and more robust filtering, no dice, still have the same crap. Ugh.

Wow. That’s all I have. Ian (Codrus) had a friend add some capacitors to his input circuits. I don’t recall the details.

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.

lol

Radiator fan works intermittently.

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!

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