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Old 08-31-2016, 11:12 PM   #1
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Default DIYPNP 1993 Miata Starts and then dies

So..I finally pulled the trigger and built a DIYPNP ecu last month. I am attempting to get the car running on this at the moment- my issue is that the car struggles to start, starts and then dies in a few moments.

Here is some background on the car:

1993 California Miata
1996 1.8 engine swapped - this was done before the DIYPNP, and car ran fine on stock 1993 ECU
MAF removed, GM IAT added
Everything else stock at the moment.

I am new to the TunerStudio software and have done my best to calibrate the 1990-1993 base map found on DIYautotune. I have figured out a few small items, but still am questioning the TPS setup for this. I have disconnected the stock TPS connector since the original 1993 throttle body is in place and does not provide a TPS signal. I have jumpered the DIYPNP TPS board signal to ground on the adapter board with a 1K resister per the instructions, but the log still shows a weird TPS signal. Is this something to correct? Any ideas appreciated, attached is a data log from the start attempt and the tune files.

Thanks.
Attached Files
File Type: msl 2016-08-31_21.38.35.msl (83.2 KB, 16 views)
File Type: zip 1993 Miata Base Map Tune.zip (1.23 MB, 5 views)
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Old 08-31-2016, 11:19 PM   #2
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Did you build the diyonp with sequential injection? Is it set to run sequential in tuner studio?
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Old 09-01-2016, 07:02 AM   #3
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you're only running on (2) Cylinders, you need to make sure all (4) injectors are connected to the MS outputs.
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Old 09-01-2016, 08:02 AM   #4
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Thanks for the replies:

Yes, I think I did wire the DIYPNP board for sequential injection. Per the 1993 Cali instructions I have wired the IN1 output to 4Z and 4V, and IN2 to 4U and 4Y. I have tried running the ECU in both batch and sequential modes with the same result, perhaps a wiring error?

Braineack, how can you tell the car is only running on 2 cylinders? Looking to learn how to diagnose that. I believe I have all 4 injector outputs wired to the MS outputs, but I could be wrong.

Thanks again.
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Old 09-01-2016, 08:28 AM   #5
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i simply made the assumption that you only hooked up two injectors.

looking at the log it seems like it's just just runs out of fuel, or doesn't ever stabilize.

i dont see the idle pwn % log
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Old 09-01-2016, 10:06 PM   #6
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So I swapped around the injectors to different combinations with no luck, my first setup seemed to run the best. How do I turn on the idle pwm % logging?
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