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Old 05-16-2018, 08:46 AM   #1  
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Default Intermittent Sync Loss MS3x

My 2000 Miata with MS3X has been randomly turning off the last month or so. I'll be sitting in traffic and it'll die, or driving down the road and randomly lose all power. If I'm stopped sometimes it'll start back up immediately, sometimes it won't start for a minute or two, then fire right back up. If I'm rolling I can usually put the clutch in, release it and it'll crank back up. This happens around one time per hour of driving and under completely random situations (warm/cold motor, accelerating/cruise/idle, sunny/raining, etc). Other than this once per hour occurrence the car runs great with no issues.

I seem to remember seeing both sync loss reason 31 and 32 (2 cams not seen, 0 cams seen), but it's been a while since I've gotten a data log of it. I've replaced both the crank and cam sensors, adjusted the crank sensor multiple times, and checked wiring for any frays/cuts immediately around the sensors. I'll start to think it's fixed, then it happens again. I'm going to start logging all the time now so I can get a log of it to share, it's been a while since I've captured it now.

Any other suggestions on what to check or things to try? I'm a little lost at this point and driving the car is pretty terrible now since I'm always waiting for it to just randomly die and leave me in the middle of traffic.
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Old 05-16-2018, 09:05 AM   #2  
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Is it when the car is hot? Possibly need the upgraded CAM sensor that ballenger motorsports sells.
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Old 05-16-2018, 10:12 AM   #3  
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It happens in all conditions, totally random as far as I can tell. This morning it died about half a mile from my house at 75 ambient temp and 120 water temp.
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Old 05-18-2018, 06:35 PM   #4  
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I finally got a datalog of my issue. This afternoon, I leave from work, a few seconds later it misses a bit. By the time I get my phone connected I've got 4 counts of sync loss. After that the car runs fine. Just over 5 minutes into my drive I'm cruising at 65mph and it just dies. Tach drops to 200rpms and holds for a few seconds before blipping to 780rpms and then flat-lining. This is while the engine is still mechanically turning ~3000rpms. After a few seconds I throw it in neutral, try to recrank the car and still get no tach signal. Pull off the side of the road, cry for 2 minutes, then the car cranks back up and drives the remaining 15 minutes home without any issue.

This happened again right at 1 hour drive time since the last occurrence. Totally random conditions, rpms, temps, etc.

Datalog and tune are attached. If anyone has any suggestions at all, even stupid ones, please throw it out there. I'm open to try anything at this point.

Attached Files
File Type: msl 2018-05-18_16-33-00.msl (3.87 MB, 1 views)
File Type: msq 2018-05-14_03.27.52.msq (204.4 KB, 0 views)
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Old 05-18-2018, 07:12 PM   #5  
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kinda sounds like the cam sensor is failing.
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Old 05-18-2018, 07:30 PM   #6  
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Quote:
Originally Posted by Braineack View Post
kinda sounds like the cam sensor is failing.
I've replaced both cam and crank sensors.
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Old 05-18-2018, 08:43 PM   #7  
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Run a tooth log and a composite log and post those.
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Old 05-20-2018, 07:25 PM   #8  
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Quote:
Originally Posted by TNTUBA View Post
Run a tooth log and a composite log and post those.
I screenshot both a tooth log and composite log, it didn't look like I could save the log itself. The issue is so rare I wouldn't expect it to show in either log, but I wouldn't know what I'm looking for either, so hopefully you can see something there.
Attached Thumbnails
Intermittent Sync Loss MS3x-toothlogger.jpg   Intermittent Sync Loss MS3x-compositelog.jpg  
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