Continuous ECU Resets (The Death) - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-30-2007, 10:25 PM   #21
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Something worth trying I suppose just to make sure it's the computer. I hate taking the case apart with my EBC mod on the endplate and my USB velcro'd to the bottom plate. Oh well, life of a megasquirt'r.
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Old 10-01-2007, 01:36 PM   #22
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I took a look at your data log, and I've confirmed those are *not* genuine resets, but rather a communications dropout. The tip-off is that in the event of a true reset, the SecL counter goes to zero and starts counting up. In a communications dropout, it picks up where left off before the glitch.

I'd try increasing the Interwrite Delay setting in MegaTune's configuration files, as described in the Communications Troubleshooting Page of the MegaManual. Let me know if that fixes it.
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Old 10-01-2007, 01:39 PM   #23
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I'll give that a try and report back, thanks so much.
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Old 10-10-2007, 10:15 PM   #24
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Hi I'm having the misfire same as described in a few different threads, that have been fixed by fixing the grounding.
Trouble is that mine is a PNP so the grounding goes through the standard loom and I don't really want to cut it up.
Do you have any ways of getting better grounds for the PNP?
Thanks
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Old 10-10-2007, 10:19 PM   #25
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You run grounds from the MS board to the middle connector, and then from the middle connector to the head.

I believe the most recent PNP's have some additional ground wiring already provisioned internally, so you'd just have to run the lead(s) out from the center connector. Mine was from the very first batch, so it has had an additional internal ground modification performed.

My misfire issue has drastically reduced in tendancy since adding additional grounding between the MS and head. It's gone from misfiring many times each time I drive, to misfiring like once every few weeks. I can only recall one occurance this month, and I've driven it a lot more than I normally do. We also grounded my accessories (gauges and wideband) to the head through their own wire, instead of having all components share a common ground wire. Future plans involve running a direct ground from the battery to the head. I'll try to knock that out this weekend when the car's already up in the air due to a brake job. I think that will totally cure it.
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Old 10-10-2007, 10:56 PM   #26
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Quote:
Originally Posted by col View Post
Hi I'm having the misfire same as described in a few different threads, that have been fixed by fixing the grounding.
Trouble is that mine is a PNP so the grounding goes through the standard loom and I don't really want to cut it up.
Do you have any ways of getting better grounds for the PNP?
Thanks
With there being a couple models out now I'm not 100% sure which you're running based on your username here, but it's probably best to shoot us an email and we can get you whatever details are needed. Please describe the symptom as completely as possible (indications of the problem, when it occurs, etc). We'll get back to you really quickly... [email protected]
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Old 10-10-2007, 11:08 PM   #27
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To add to this.
Couple days ago i turned the key to the on position after letting the car sit all weekend, all of a sudden it goes BANG, like a backfire. No idea where it came from, but some smoke came out of the dash. So the smoke part is really weird and unexplainable. So i took part of the dash off and looked for an electric fire, i found nothing. Turned the key on and started the car, all was beautiful. It idled wonderufully with the 550s with the A/C turned on. Soon as i turned the A/C off it started surging with the AFRs bouncing back and forth between 11-dead lean. So i mess with it a bit and lean it out trying to get it to smooth up because the cells were super rich right there. So nothing fixed it.
I take a break and come back later. It does the same weird backfire thing, this time I have the laptop hooked up while i start it. All of a sudden MT starts going crazy with resets, i confirmed they are communications resets. I'm using the DLP USB adapter built into the case. So 25 resets in two minutes and I'm sick of it already. So i tear out my PNP harness setup and MS. Plan is to rejumper the leads i cut for the USB adapter and use an external adapter and DB9 cable. Hopefully that solves my problem. So i'll clean my harness up while i'm at it. Should have it put together by saturday. But what a ordeal, MS is a heartache. I'd be better off with a $10 shitty laptop and power inverter using a straight DB9 cable. Maybe I should try the palm.
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Old 10-11-2007, 12:12 AM   #28
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Thanks for the help guys . I've sent an email to the address that FoundSoul asked. I will post to let you know what happens and hopefully how to fix the problem.
Col
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Old 10-31-2007, 08:04 PM   #29
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I have recieved an email including pictures on how to increase the earthing on the PNP , and will have to pull the ecu to fix it. I will let you guys know how it goes when I am able to get the time to do it.
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Old 10-31-2007, 08:16 PM   #30
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Shouldn't be to hard for you. It's worked for quite a few other people already.
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