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car will crank but not start 97 ms3x

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Old 03-08-2018, 02:46 PM
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When it was running I'd cycle the key and could hear relays clicking but I don't hear them now. I'm not sure if Lars told you but the car is a jdm rhd miata.
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Old 03-08-2018, 03:02 PM
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Originally Posted by 97eunos
The starter cranks just fine every time I turn the key. But there's no sound of it igniting or injecting fuel. While cranking the wideband works and it'll pin at 19 as no fuel is being injected. While Attempting communication with laptop it won't change from "not connected". I have the ecu currently sitting on my table tried using the printer cable and serial cable to power it up (without the db37 connectors) and it still says "not connected"
you can't power the unit up that way... the ms would technically provide 5v to the serial ports...
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Old 03-08-2018, 03:04 PM
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Originally Posted by Braineack
you can't power the unit up that way... the ms would technically provide 5v to the serial ports...
My mistake, it wasn't working with it in the car so I figured I'd try unplugging everything and trying it on my bench. I'm just at a complete loss for ideas as for what to try to get it to work reliably.
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Old 03-08-2018, 03:10 PM
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the only thing that I could think that would cause this is an intermittent short somewhere -- so the MS protects itself and you can't connect/run, or a loose power connection.

when the car wont start and you cant connect to the ecu with the to key ON, are you getting 12v to ECU (tan/red wire on your harness) or the injectors? It's run off the Main Relay which is behind the FUEL INJ fuse -- basically everything on the white/red power wire in the car (injectors, fuel pump, solenoids).
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Old 03-08-2018, 03:21 PM
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Originally Posted by Braineack
the only thing that I could think that would cause this is an intermittent short somewhere -- so the MS protects itself, or a loose power connection.

when the car wont start and you cant connect to the ecu with the to key ON, are you getting 12v to ECU (tan/red wire on your harness) or the injectors? It's run off the Main Relay which is behind the FUEL INJ fuse -- basically everything on the white/red power wire in the car (injectors, fuel pump, solenoids).
I didn't check on the tan/red wire in the car harness, will have to check that later today as I'm working and car is at home, but the 12v switched wire that is soldered with the tan/red in the jumper harness gets 12v with key on
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Old 03-08-2018, 03:35 PM
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basically, that's the same wire. if the car dies/wont start & MS wont connect while still keyon, but you have 12v on that wire, then the problem is happening within the MS itself.
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Old 03-08-2018, 03:44 PM
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Is there a way I can tear into it on my own and see what the issue is, or do I have to send it back to you/Lars?
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Old 03-09-2018, 09:51 AM
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Originally Posted by 97eunos
The starter cranks just fine every time I turn the key. But there's no sound of it igniting or injecting fuel. While cranking the wideband works and it'll pin at 19 as no fuel is being injected. While Attempting communication with laptop it won't change from "not connected". I have the ecu currently sitting on my table tried using the printer cable and serial cable to power it up (without the db37 connectors) and it still says "not connected"
I just had some starting problems yesterday, uping my WUE fixed it. TUNE the car, play with settings (do research before you break something) but play with things and learn, it will serve you so so good in the long run.
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Old 03-09-2018, 09:59 AM
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Originally Posted by btill115
I just had some starting problems yesterday, uping my WUE fixed it. TUNE the car, play with settings (do research before you break something) but play with things and learn, it will serve you so so good in the long run.
It's an ecu issue not a tune issue it was just a coincidence that it started after trying so many times.
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