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Old 10-02-2009, 05:37 PM   #1
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Default controller reset

One ******* problem after another:

I have been having random blips in my CAS signal up to 10000 rpm or so for a while now durring highway cruise that cause random short jerks... and now i am having another problem-

This problem started this week and has progressively gotten worse. Under boost usually above 5psi or so and under half throttle or more , it suddenly cuts the fuel and wont accelerate. NO THIS IS NOT OVER BOOST PROTECTION, IVE CHECKED. I just did a datalog and found that these are actually controller resets. Any idea of what would cause the controller to reset under boost for no apparent reason?

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I am running a MS1 with hi-res code, the normal CAS and normal board mods. DIY boomslang harness in parallel with my stock ecu.
Attached is the log and msq
Attached Files
File Type: xls 100209 issue1.xls (356.1 KB, 43 views)
File Type: msq new motor hiboost.msq (34.5 KB, 52 views)
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Old 10-02-2009, 05:49 PM   #2
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The jerks and hesitation on the freeway can signify a dying CAS. The first one I had the symptoms you describe on cruise before it died, but it was weeks after the jerking problems. I had to keep the revs up to keep the car from dying.

As for the datalog, the datalog is showing the reset after i see that drop in those values... are you shifting at this point, or just trying an WOT run?
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Old 10-02-2009, 06:06 PM   #3
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not WOT...just rolling into boost and slowly giving it more gas. It does happen durring WOT also. I just pulled out my boomslang and im checking connections.
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Old 10-02-2009, 06:14 PM   #4
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I may have found the issue. the CAS shielded wire on my boomslang has a cut in it right where it attatches to the stock harness plug. It may be touching the shielding and causing some of these issues.
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Old 10-02-2009, 06:45 PM   #5
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you really dont need a shielded wire on the tach signal. unless that cut is all the way through the shielding to the wire underneath, i doubt that is your issue.

Edit: Also, no mention of your grounding scheme. Care to elaborate?

Last edited by wayne_curr; 10-02-2009 at 07:13 PM.
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Old 10-02-2009, 08:06 PM   #6
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The main wire is exposed...not just the shield The boomslang uses OEM grounds... with those grounds also tieing to a screw grounding it to the body right by the ecu (behind the pass seat)... that is the ground for my wideband and knock system as well. The stock engine ground ( behind the turbo to the bellhouseing) has been replaced with 6 gauge battery cable. I definetlly plan on bringing a 6 gauge ground strait from the battery to the ecu at some point...and maybe even strait to the engine, but im not sure if that is the problem
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Old 10-02-2009, 08:33 PM   #7
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If I were you, i'd consider running soldering all the ground pins on the DB37 into one 6 gauge wire all the way to the stock ecu grounding point. Mine is on the intake mani I think, I cant remember. It may not be the same for you.
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Old 10-05-2009, 04:41 PM   #8
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Well I re-soldered the connection for my CAS. Checked all of my grounds, and found a vacuum leak (below the EGR on the manifold... hose blew off). I put everything back and the thing ran great. Not one single stumble...... Until today. I did one good pull from like 20-100 bringing it up to around 6200 rpms.. after that the resets were back. It does it almost every time i get into boost. Nothing looks obviously bad in the engine bay...no leaking injector o -rings, no vacuum leaks, ect ect ect.

WHAT IS UP WITH THIS!?

here is a pic of my new log today...
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Old 10-05-2009, 04:45 PM   #9
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the last time i saw a log like that the user has a splitfire ignition system installed that was wreaking havoc...he removed it for stock coils and all was well.

can you find someone with a know good ignitor to test out.

what firmware? HR_10e? .1uF cap installed on js8?
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Old 10-05-2009, 04:52 PM   #10
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Quote:
Originally Posted by Braineack View Post
can you find someone with a know good ignitor to test out.

what firmware? HR_10e? .1uF cap installed on js8?
No,the only local miata I know of is my buddies 1.6L

Yes... HR_10e with the .1uF cap installed on js8 (i will be double checking my work this week)
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Old 10-05-2009, 11:20 PM   #11
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Other than pulling the MS out and checking the board, what should my next steps/ tests be to solve this problem?
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Old 10-08-2009, 07:27 PM   #12
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Problem is worse...Undrivable actually. I looked over the boomslang harness again and popped the MS open..everything looks fine. Could a bad CAS or coil cause this? It just seems weird how it runs perfectly until it is under load and then its FUCKED. My stock Tach doesnt flicker, nor do any of my dash lights or anything like that. I really need to get this fixed before dyno day at the end of the month!

Edit: I also had a short in my headlights a week or 2 ago. I found my headlight harness was pinched, and fixed the low beam but my hgih beam is still shorted out. Do you think maybe there is an issue somewhere in my engine bay harness?
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Old 10-08-2009, 07:40 PM   #13
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That sucks man. Have you tried re-flashing firmware?

I still think you should solder all the ground pins on your DB37 and running one thick ground to the stock ecu grounding point along with the ground for your wideband.
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Old 10-08-2009, 07:45 PM   #14
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Quote:
Originally Posted by wayne_curr View Post
That sucks man. Have you tried re-flashing firmware?

I still think you should solder all the ground pins on your DB37 and running one thick ground to the stock ecu grounding point along with the ground for your wideband.

Re-flashing the firmware is next on my list...along with improving the grounding. I just odnt get how i can go from having it run fine to this. I have never had a ground issue before...I have since painted the engine bay and engine itself, but the grounds are fine and the car has driven 500 miles no problem.
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Old 10-08-2009, 07:51 PM   #15
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I started off just using the stock ECU ground wires for my megasquirt. Then one day I got horrible RPM spikes and the car would simply shut off while idling because of such horrific resets.

I cleaned the grounding points in the engine bay and added lots of more grounding off the DB37 run straight through the firewall and it runs smoov as butta now.

I do however get resets in MT still but they dont reset my sync counter and do not affect driving.
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Old 10-11-2009, 06:09 PM   #16
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-re-loaded the hi res firmware
-added a 6awg wire from the battery to near the ecu where the wideband /ecu grounds to the engine ground next to the egr to the engine ground above the alt.

STILL GETTING RESETS.
I haven't grounded the DB37 Directly..it is still going thru the stock harness, but i checked continuity on all of the pins to ground and it is perfect. I just dont feel like going thru the hassle of modifying my boomslang because i doubt this will fix the issue.

ANY ideas?
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Old 10-20-2009, 07:57 PM   #17
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So after finally getting around to independently grounding the megasquirt... I still had resets.

Then while double and triple checking everything, I noticed that i never tightened the mounting bolts for the coil that bolts onto my valve cover..it was very loose. I only had one bolt holding it in I believe... MY BAD.

It now runs fine. Could this really have been it??? lol. I will try to drive it more 2morro. My dyno day is saturday and im hoping to make it.
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Old 10-20-2009, 08:42 PM   #18
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So what ever happened to the dyno spots? Any open?
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Old 10-20-2009, 08:44 PM   #19
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Oh.. sry i forgot. Now that my car is running we are up to 13 people. I believe we are going to cap it there. They said a max of 15 people, but we are starting later than expected.
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Old 10-20-2009, 08:55 PM   #20
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The coil bracket?

I don't see how this would cause so many problems.
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