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Old 05-12-2013, 09:13 PM   #1
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Default ms3x doesn't start car anymore

Hello! I've been looking around everywhere for informations and stuffs and I'm bet the Brain is getting sick of me bothering him haha, also, it can't hurt to have more thinkers helping out....

I have ms3x, it has worked fine and started my car for the latter half of last year, and she fired right up and drove after sitting all winter! woot!

...next thing i know? no start, apparently has no-spark. i hadn't changed anything about the tune though. my mechanic plugged in the oem ecu and it fired right up everytime so he tried to tell me there's a problem with the ms ecu. now i got it home and plugged the ms3x back in, no start a few times, started and ran really awful for a few seconds before dying a few times, and back to no start.

billr from msextra tells me (having looked at one of my .msl files) that i "clearly have a tach-in problem" ... idk what that means!

i can post my msl's and csv's if you'd like?

on a sidenote: i also saw on diyautotune that you can use ms as a piggyback and have the stock ecu handle startup and ignition, and just use the ve fuel autotune to have an OK running vehicle? this would be an ideal scenario for me ...i'm not trying to be a race car owner here, just want to drive my car around. my ultimate goal is to have the piggyback effect without having both ecu's hooked up - the stock ecu starts her and keeps her running GREAT! but sadly keeps my feul running super-duper rich while cruising/idling and super-duper thin under boost...

help please?
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Old 05-12-2013, 09:24 PM   #2
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tach in problem, means the MS isnt getting a stable tach signal to it. Settings on the MS need to be changed or maybe MS hardware issue ?
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Old 05-12-2013, 09:26 PM   #3
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attached msq is current tune - used to be A OK - rarely starts anymore...
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File Type: msq imperfekt tune.msq (160.5 KB, 55 views)
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Old 05-12-2013, 09:29 PM   #4
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Quote:
Originally Posted by Gt2560rMiata View Post
tach in problem, means the MS isnt getting a stable tach signal to it. Settings on the MS need to be changed or maybe MS hardware issue ?
i like the word "stable" you use because if it were electrical wiring i'd say there's a short somewhere, it's unstable - sometimes sparks and starts and then dies, but not often. used to run just fine

thank you for your ideas
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Old 05-12-2013, 09:58 PM   #5
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where does the tach in come from?

having read "you should be able to share the CMP, CKP, CAS signals with the stock ecu to get your TACH signal to trigger the MegaSquirt so you can take control of the fuel injection and leave ignition control to the stock ECU for now...for fuel only control you just need to wire up the IAT, CLT, WB02 and make sure you're getting a good TACH signal"

it makes me think that the TACH signal comes from the CMP CKP and CAS as a collective unit? :\
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Old 05-13-2013, 12:01 AM   #6
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i just found the "compare tune" thing and compared my current tune to one of my restoration points from march, and one from october of last year - it appears as though my crank advance has been changed from 15 degrees to 10 degrees, would this change be enough to be screwing me up?? i can't get to my car to check it now... unfortunately :\
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Old 05-13-2013, 09:44 AM   #7
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Try this first:

You need to open the ECU and readjust the Crank and Cam VR conditioners.

First you'll need to slide the mainboard out of the case. Remove the two serial port studsfrom the USB side of the case. IIRC they are 3/16".

Remove the 4 screws on the opposite end-plate of the case and you can now slideit out from the dual db37 side.

You should be looking at a green expander board and a white daughter-boardconnected by two ribbons.

On the green expander board, lift the top ribbon to expose the two adjusting pots. They are gray cubes with little brass screws on them. Turn them both CCW 10 times. Then on the top one, R11, turn it CW 3 times.

Now remove the studs from the top db37 holding the green expander inplace; kinda of fold it up out of the way for access.

There are two more pots you can adjust here for the crank signal on the mainboard. Turn them both back 12 full turns coutnerclockwise, then turn the bottom one (near the(c) 2005) back 7 full turnsclock-wise.

Reassemble. Be careful when sliding theunit back in, the mainboard sits on the third slot, the expander as well on thetop half.

Last edited by Braineack; 05-13-2013 at 09:55 AM.
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Old 05-13-2013, 12:09 PM   #8
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You are awesomepossum. Will do.
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Old 05-14-2013, 08:51 PM   #9
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Crank no start
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Old 05-14-2013, 09:54 PM   #10
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Plugged in OEM ecu, fires up immediately- no cranking or engine turning over, just turn the key and it starts instantly. I am bumfuzzled... *Scratches head*

Last edited by imperfekt; 05-14-2013 at 10:20 PM. Reason: clarification
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Old 05-14-2013, 10:47 PM   #11
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I picked a tunerstudio restore point from when the car started and ran fine... Again no start.
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Old 05-16-2013, 03:05 PM   #12
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...a couple CSVs from today.
Attached Files
File Type: csv 2013-05-16_13.44.16.csv (49.7 KB, 42 views)
File Type: csv 2013-05-16_13.48.29.csv (50.4 KB, 51 views)
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Old 05-16-2013, 04:17 PM   #13
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no crank signal.
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Old 05-16-2013, 04:34 PM   #14
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Quote:
Originally Posted by Braineack View Post
no crank signal.
this may sound silly, but... idk where it went! hehe, :S or more like why the MS isn't picking it up - it was doing fine until a couple months ago

...nor do i have any clue where to start looking for the signal problem. i believe the wiring is just fine.
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Old 05-16-2013, 04:40 PM   #15
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either in the harness, or something something inside the MS failed. never had this happen before, try going further CW with r56 and see if you can get a signal, take some pics of the board while you are in there just in case.
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Old 05-16-2013, 04:43 PM   #16
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yes sir. would it hurt to turn it all the way down again, and just turn it CW half turns until a signal comes through, or would that damage something?

just wondering before i go-a-tinkerin'
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Old 05-16-2013, 05:08 PM   #17
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Attached Thumbnails
ms3x doesn't start car anymore-photo0365_zps201f8fb6.jpg   ms3x doesn't start car anymore-photo0364_zps1f4f15b5.jpg   ms3x doesn't start car anymore-photo0363_zpsaa3ced12.jpg   ms3x doesn't start car anymore-photo0362_zps06e8c42a.jpg   ms3x doesn't start car anymore-photo0359_zpsd80581b0.jpg  

ms3x doesn't start car anymore-photo0358_zps88be7cb6.jpg   ms3x doesn't start car anymore-photo0357_zpse2b52d2e.jpg  
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Old 05-16-2013, 05:12 PM   #18
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just to confirm, the one in the middle here is backed out at least 12 turns CCW. and the one to the right is turned 7 CW after going back 12 turns CCW correct?
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Old 05-16-2013, 05:16 PM   #19
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yes, i did the turns CCW and back a few times just to make sure i did it right and no start any of the times...

and you want me to turn the one on the right more CW?
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Old 05-16-2013, 05:17 PM   #20
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yeah, try going 1 more full turn clockwise, then another if that doesn't help.
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