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Old 11-03-2007, 08:25 PM   #1
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Alright....i have read and tune my miata to my knowledge....no matter what i do the engine shakes.... then i check my injector to see if there's any fuel flowing to all injector but that last one has no power!!! i checked all my wire and they are okay... pluged in my stock miata ecu and fires right up nice...so have anyone have this problem before... it seems to me that my fourth injector isn't grounded...so my msPnp is not working 100% correctly?
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Old 11-03-2007, 10:37 PM   #2
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they all get power off the same spot (w/r off the CAS) then the signals goes into the ecu, 1 & 3 and 2 & 4 are batched.

Last edited by Braineack; 11-03-2007 at 10:49 PM.
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Old 11-03-2007, 11:30 PM   #3
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okay...they red and white is power and runs trough all the injectors... but there is the solid green wire that runs from the fourth injector...well, i have this plug that i plug in the injector wire and when that car is idling the light flases...and the fourth one doesn't flash..but flashes when i plug in the stock ecu...im not sure how it works inside the mega squirt but is it not grounding the fourth one for some reason...common...someones gotta forgot something on the mspnp right? hope i can retrun it for a new one...
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Old 11-04-2007, 12:56 AM   #4
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Jerry checks all the MSPNP's out on his cars before they ship. He starts the car, and lets it idle, and makes sure the cooling fans turn on. So odds are the PNP is OK and the problem lies in your car. Why not probe the injector harness with a DMM?


BTW, thanks for letting us know what year and motor you have
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Old 11-04-2007, 01:26 AM   #5
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the fact you have a solid green wire says sequential injection....you dont happen to have a CA '93 do you?
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Old 11-04-2007, 01:41 PM   #6
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Quote:
Originally Posted by Eunos_roadsterna6ce View Post
okay...they red and white is power and runs trough all the injectors... but there is the solid green wire that runs from the fourth injector...well, i have this plug that i plug in the injector wire and when that car is idling the light flases...and the fourth one doesn't flash..but flashes when i plug in the stock ecu...im not sure how it works inside the mega squirt but is it not grounding the fourth one for some reason...common...someones gotta forgot something on the mspnp right? hope i can retrun it for a new one...
You certainly have our support man-- have you been in touch with any of my team yet? If we need to take a look at it we'll be glad to, and we'd get it right back to you without delay.... [email protected]
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Old 11-04-2007, 02:41 PM   #7
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from: brainneck
the fact you have a solid green wire says sequential injection....you dont happen to have a CA '93 do you?


ger: yes i do have a ca 93 is it a problem? please don't tell me i wont be able to run mspnp....if it is then what can i do? please help.....
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Old 11-04-2007, 02:44 PM   #8
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Quote:
Originally Posted by Eunos_roadsterna6ce
okay...they red and white is power and runs trough all the injectors... but there is the solid green wire that runs from the fourth injector...well, i have this plug that i plug in the injector wire and when that car is idling the light flases...and the fourth one doesn't flash..but flashes when i plug in the stock ecu...im not sure how it works inside the mega squirt but is it not grounding the fourth one for some reason...common...someones gotta forgot something on the mspnp right? hope i can retrun it for a new one...

You certainly have our support man-- have you been in touch with any of my team yet? If we need to take a look at it we'll be glad to, and we'd get it right back to you without delay.... [email protected]


Ger: yes foundsoul i have contact DIY...i believe i email something to Matt..but i dont' think DIY is open on the weeken...hope to hear something good...
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Old 11-04-2007, 03:39 PM   #9
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The '93 CA miata started running sequential injection like the 94-95 miatas. So two of your injectors might not be getting any signal at all, not just the one.

what you can do for a simple fix is wire the Green and Yellow/Blue together & Green/White and Yellow injector wires together.

a simple wire stuffed into the back of each to test should work.
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Old 11-04-2007, 03:47 PM   #10
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THANKYOU BRAINNECK!!!!!! i will try that out......
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Old 11-04-2007, 03:50 PM   #11
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just test it without cutting wires or soldering just to test. but i think that's the issue.
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Old 11-04-2007, 03:56 PM   #12
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i will test it when i get home...i'm at my friends house...i'll let you know what happen...i have that miata repair manual...i'll try to look it up there too for the different years...
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Old 11-04-2007, 03:59 PM   #13
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im certain if you have a 93 and have a green wire off #4 then you have sequential injection. I assume the 9093MSPNP is not setup for your oddity, but it's a simple fix.
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Old 11-04-2007, 04:39 PM   #14
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I was under the impression Jerry revised the 90-93PNP to include support for 93CA cars by jumping the 2 extra injector outputs to their correct batch fire partner. However, if your PNP is "old" like mine, and indeed you do not have 93CA support, you can just modify your injection harness. All injectors get +12V, and then the ground "fire" signals are batched between 1&4 and 2&3
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Old 11-04-2007, 05:23 PM   #15
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wait wait...

you gotta have the power to the injectors wired up to the same 12V as the CAS? or can you just get another 12V reference from another point?
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Old 11-04-2007, 06:21 PM   #16
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You can get 12v from anywhere for the CAS. He's just saying that the cars that came with a CAS get power from the same place.
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Old 11-04-2007, 06:35 PM   #17
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Quote:
Originally Posted by Ben View Post
I was under the impression Jerry revised the 90-93PNP to include support for 93CA cars by jumping the 2 extra injector outputs to their correct batch fire partner. However, if your PNP is "old" like mine, and indeed you do not have 93CA support, you can just modify your injection harness. All injectors get +12V, and then the ground "fire" signals are batched between 1&4 and 2&3
We have revised them to handle all 1.6l 90-93 cars, batch and sequential... but this must have been just prior to that change. Current units being sold work on the 93 CA cars as well.
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Old 11-04-2007, 07:27 PM   #18
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Originally Posted by badboy88000 View Post
wait wait...

you gotta have the power to the injectors wired up to the same 12V as the CAS? or can you just get another 12V reference from another point?

dont worry about the power side, just attach the ones I said to.
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