MS PnP 90/93 modded with VTPS won´t start - Miata Turbo Forum - Boost cars, acquire cats.

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Old 08-16-2009, 02:12 PM   #1
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Default MS PnP 90/93 modded with VTPS won´t start

I already posted thsi on m.net but it seems nobody ever before had this problem:

Hi,

got a little problem out there.

My car (see it as a 90-93) had a complete engine rebuild during some months til now. Until restart, I did the VTPS mod to the MS meanwhile.
Now back on and all together again the car doesn´t start at all.

The fuel pump doesn´t start and the engine therefore doesn´t fire up.
I already wrote Matt at DIY AT and he told me to disconnect the normal TPS which is fitted.

I did and nothing happend.
I bridged GND and F/P on the diagnostics connector under the hood, the fuel pump permanently runs (and delivers fuel to the rail), but the car doesn´t start.

The car is fitted with a LC-1 (which I ran together with the unmodified MS PNP before the rebuild) and NO OEM O2.

Is there something I forgot??


I tried to start with a 90`s ECU (with AFM) which I have, but the same.

I also connected the 10A fuse under the hood, which is necessary for the OEM ECU (which has to be removed when using the MS PNP).



I have a Fuji ITB Kit lying around which should be installed when the car has proved for 1000mls that it´s all ok with the engine.

Would be glad for help

It makes me sad.

My laptop has connection to the MS, so that thing is working.

I tested the MS with removed AFM and stock ECU with AFM.
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Old 08-16-2009, 03:14 PM   #2
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Would calibrating the TPS have anything to do with it?
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Old 08-16-2009, 03:45 PM   #3
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Hmm, there is no TPS. I disconnected it.

The starting try with the stock ECU has been done with the stock TPS.
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Old 08-16-2009, 09:27 PM   #4
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Sounds like perhaps a no spark situation, does the MS show RPM on your laptop? Have you checked for spark?
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Old 08-17-2009, 12:53 PM   #5
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MS shows RPM, but (as I found out today) only 1 and 4 have spark.
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Old 08-17-2009, 03:33 PM   #6
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Bad ignitor?
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Old 08-17-2009, 05:32 PM   #7
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did you update the firmware to delete the AFM with the ignitor plugged???
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Old 08-19-2009, 04:23 PM   #8
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Think we got it.

Got the message today that Q5 on the daughterboard was dead. So it seems I forgot the fuse in the fuse box under the hood...

I did a firmware update, but with the ignitor plugged off.

For security I already changed the coils and will do this to the ignitor, too. For cases like these, I´ve got them things lying around.
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Old 08-26-2009, 02:14 PM   #9
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Got it.

I killed the transistor Q5.

Updated firmware aaaaaand "vroom"

Thanks everybody!
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