MS3 cutout and sync loss. LS2 coil failure or ? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 06-27-2016, 02:18 PM   #1
Elite Member
Thread Starter
iTrader: (6)
 
TorqueZombie's Avatar
 
Join Date: May 2011
Location: Lebanon, TN
Posts: 1,668
Total Cats: 63
Default MS3 cutout and sync loss. LS2 coil failure or ?

A few weeks ago the LS2 coils I've been running started to cut out. Long story short touching the harness made them come back. So I made another one from OEM parts and a weatherpack.

Now yesterday at AutoX the ignition cut out near the end of my 3rd run and the check engine light came on. The event happened at 6k rpm ish. I didn't have data logs running at the time and thought it might have been a knock event or something. I checked everything in the pits that I could. It felt like someone was flipping the on/off switch on my ignition. It still ran and idled when the rpm came down. It got me through the grid and all. I decided to try a 4th run and in the second turn at high rpm it cut out again so i coasted the course idling. This time I have a datalog. It was miserable hot out and intake temps hit 140s. I figured the coils got hot at first.

It runs and drive fine it seems as long as high rpm is avoided. When the cutout happens the AFRs seem to spike leading me to believe the ignition is cutting out not fuel injectors. I will add I swear the Walbro fuel pump is louder and nastier sounding at "key on" than it use to, but I may be hyper sensitive to things now.

The only things I've changed recently:
-new OEM to weather pack harness.
-started using launch control
-new brakes and RS3 tires (just on the list)

Here is the last run datalog.
2016-06-26_13-42-52.msl


On the drive home we replicated the cut out.
cutout_test.msl


Not too sure about these setting. I swear I saw somewhere on the site it should be set to "going low" at spark output. I also think I saw that Spark Duration can go to 2ms.





Also am I wrong that all the "engine light" stuff is off? Not sure what happened.
Attached Thumbnails
MS3 cutout and sync loss.  LS2 coil failure or ?-80-spark_settings_fb7e21c518e99a50b0a662432a249a5aa9773eba.png   MS3 cutout and sync loss.  LS2 coil failure or ?-80-checkenginelight_ad500374a3ce56b13436a20034a22de506d65561.png  
TorqueZombie is offline   Reply With Quote
Old 06-27-2016, 03:14 PM   #2
Supporting Vendor
 
Matt Cramer's Avatar
 
Join Date: Sep 2006
Posts: 2,259
Total Cats: 51
Default

Can you capture the sync loss in a composite log?
Matt Cramer is offline   Reply With Quote
Old 06-27-2016, 03:23 PM   #3
Elite Member
Thread Starter
iTrader: (6)
 
TorqueZombie's Avatar
 
Join Date: May 2011
Location: Lebanon, TN
Posts: 1,668
Total Cats: 63
Default

Here is a vid of it revving in the garage. I'd drive it, but there is a decent storm going on and would like to not be stuck in it if it goes wrong.

TorqueZombie is offline   Reply With Quote
Old 06-27-2016, 03:29 PM   #4
Elite Member
Thread Starter
iTrader: (6)
 
TorqueZombie's Avatar
 
Join Date: May 2011
Location: Lebanon, TN
Posts: 1,668
Total Cats: 63
Default

Quote:
Originally Posted by Matt Cramer View Post
Can you capture the sync loss in a composite log?
Absolutely, give me a lunch break and google search of how to do it and I'll be back
TorqueZombie is offline   Reply With Quote
Old 06-27-2016, 04:00 PM   #5
Elite Member
Thread Starter
iTrader: (6)
 
TorqueZombie's Avatar
 
Join Date: May 2011
Location: Lebanon, TN
Posts: 1,668
Total Cats: 63
Default

Ok so I never used this before and am not sure what I'm looking at. Here is a short pass times 2 and a sync log as well.

EDIT: the sync log didn't get weird until almost the end. It didn't want to replicate the issue for a moment. What else is used for sync on a VVT motor. crank and cam I thought
Attached Files
File Type: csv synclossraindrive.csv (327.1 KB, 16 views)
File Type: csv synclossraindrive2.csv (400.6 KB, 15 views)
File Type: csv synclossraindrive2synclog.csv (10.6 KB, 12 views)
TorqueZombie is offline   Reply With Quote
Old 06-28-2016, 09:32 AM   #6
Supporting Vendor
 
Matt Cramer's Avatar
 
Join Date: Sep 2006
Posts: 2,259
Total Cats: 51
Default

I don't see it showing a sync loss on the logs posted. This is usually indicated by red lines on the lowest trace of the log. But one of the logs MIGHT have shown some noise on the crank sensor feed. Try adjusting the main board VR trim pots.
Matt Cramer is offline   Reply With Quote
Old 06-28-2016, 10:18 AM   #7
Elite Member
Thread Starter
iTrader: (6)
 
TorqueZombie's Avatar
 
Join Date: May 2011
Location: Lebanon, TN
Posts: 1,668
Total Cats: 63
Default

I'll look I to finding those. I assume that's a mechanical thing inside the ECU. I did find that the crank position sensor was at its farthest edge of its range last night. A drivers licence and VA ID are oddly .059 in according to my caliper. The largest feeler I have is .032in so set it to that. No fix. I found a spare cam position sensor last night and swapped it. I'll try a drive after I Google the pot stuff and finish coffee.

Thanks. I have a couple more logs I'll drag out. Being a high speed logger it seems to not record the whole period of time, but just a window over and over. I might have on from last night I caught just as it started to break up sparks.
TorqueZombie is offline   Reply With Quote
Old 06-30-2016, 11:07 AM   #8
Elite Member
Thread Starter
iTrader: (6)
 
TorqueZombie's Avatar
 
Join Date: May 2011
Location: Lebanon, TN
Posts: 1,668
Total Cats: 63
Default

I dug up a spare cam position sensor and boom it seemed fixed. Couldn't get it to replicate the issue all day. Had to drive an hour out of town and did it once I think and then a couple times on the way back. I guess I'll have to open the case and mess with the pots if I can get my hands in a scope.
TorqueZombie is offline   Reply With Quote
Old 07-01-2016, 07:52 AM   #9
Senior Member
 
Join Date: Apr 2011
Location: Hollywood, FL
Posts: 520
Total Cats: 18
Default

Cam Sensor Issues / Fix - Spec Miata Rules & Competition - Mazda Racers

Anyone having sync loss issues with NB ignition pickups has to look at this "fix" that the Spec Miata guys have come up with. Mind you this is happening on factory ecu's so the issue is global, not just with Megasquirt.

I found it good reading. Thanks to PatCleary for bringing up the link in another thread about sync loss issues.
hector is offline   Reply With Quote
Old 07-01-2016, 07:53 AM   #10
Senior Member
 
Join Date: Apr 2011
Location: Hollywood, FL
Posts: 520
Total Cats: 18
Default

Cam Sensor Issues / Fix - Spec Miata Rules & Competition - Mazda Racers

Anyone having sync loss issues with NB ignition pickups has to look at this "fix" that the Spec Miata guys have come up with. Mind you this is happening on factory ecu's so the issue is global, not just with Megasquirt.

I found it good reading. Thanks to PatCleary for bringing up the link in another thread about sync loss issues.
hector is offline   Reply With Quote
Old 07-09-2016, 09:23 PM   #11
Elite Member
Thread Starter
iTrader: (6)
 
TorqueZombie's Avatar
 
Join Date: May 2011
Location: Lebanon, TN
Posts: 1,668
Total Cats: 63
Default

So far it seems the connector pins are the culprit. Tested the sensor with a meter and screwdriver and the first one did odd things, but my seemed okay. By odd I mean it would lock to one voltage until bonked with a screwdriver. Then I tweaked the connector pins with an eyeglass sized flat head. After swapping and fiddling with the pin spring pressure I can't replicate the cut out.

Just re-pinned the connector and seems to be fine. So chased two problems and new sensor and new pins solved it.
TorqueZombie is offline   Reply With Quote
Old 07-11-2016, 08:43 PM   #12
Newb
 
Join Date: Mar 2011
Location: VA
Posts: 41
Total Cats: 0
Default

I seem to be having this issue or at least seems like on my 01 on stock coils. I seem to get it while at load, check engine light will trip and the car will just die and eventually coast to a stop. Leave it off for a second and it will fire right back up. Anyone got any input?
Attached Files
File Type: msl 2016-07-11_19.30.29.msl (811.7 KB, 17 views)
mzmanny is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Free OEM parts afm Miata parts for sale/trade 0 06-23-2016 09:27 PM
OEM cloth top 1FastMx5 Miata parts for sale/trade 1 06-23-2016 03:30 PM
Checking in simon_C Meet and Greet 6 06-17-2016 11:38 PM
checking in from Ft. myers. SPR1 builder! SPR1_MX5 Meet and Greet 7 06-14-2016 03:52 PM
Rev MS3Enhanced, MSM, first run issues TheIglu MEGAsquirt 25 06-07-2016 10:43 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 05:58 PM.