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Old 07-31-2013, 02:13 PM   #1
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Default Microsquirt v2.2 cooked.

2000 miata LS 60k miles with IAT mod and NGK powerdex and a 94 alternator.
thats it for mods.

after about 3 days of the car running great on megasquirt, merging on to the highway i started to experience power loss, so i pulled off and the car started just billowing white smoke.

of course i thought, oh no my head gasket. but given the mileage, the fact i'm not losing coolant, my coolant isnt bubbling, and my compression is good i certainly ruled that out.

next i tested for spark. i am getting no spark in 4, but i am getting it in 1. its intermittent so i replaced coil pack, plugs, wires, nothing. with the output test mode i could get coil b and d to click, but not spark and that was it.

so i pulled out my brain and this is what i found smelled before even opening it.

any ideas?

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Old 07-31-2013, 02:28 PM   #2
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that's a fuel driver.
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Old 08-01-2013, 03:39 AM   #3
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Originally Posted by Braineack View Post
that's a fuel driver.
Agreed, somehow you've blown an injector driver on the uS card.
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Old 08-01-2013, 04:44 AM   #4
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Usually this happens if your injector's coil is damaged (zero resistance on the coil) or if you have low impedance injectors or if there's a short on the injector low side to 12V.
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Old 08-07-2013, 11:24 AM   #5
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thanks for the heads up. it is still under warranty so the microsquirt board is due to be replaced. hopefully i wont have the issue again, guess i'll go ahead and install those 650cc's that are sitting here waiting for my TD04. i'll keep you all updated
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Old 08-28-2013, 02:07 PM   #6
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well, here is what has been concluded:

nothing really.

alright well.... idk, tunelife is a trial and error sort of thing.

DIYautotune was curious about my alternator setup, thinking the short could have come from that setup. the car was running for about a week fine before it blew that drive transistor.

i used a 94-95 alternator that self regulates voltage. it was charging fine, we had the dash light working properly as well.

DIY assumed it as a defective resistor and warrantied out the board. it will be here next week or so.

i plan to install my 650cc injectors even though i am not turbo yet.
Custom Fiveo 026IMP650X are the injectors i got off of Custom OEM Fuel Injectors from FiveOMotorsport

idk. here we go. i'm just praying i dont have the same issue again and its something wrong with my car causing this. i pray pray pray that it was indeed a defective drive transistor.
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