MSIIDIY 1.6 Initial Start up sounds like a WRX - Misfire?
#23
Yes, I have a California car... although I am not too certain if the hood was changed out during its previous lifetime. I know I have only 1 cat and 1 o2 sensor.
I have tested my injector circuits and everything checks out fine. I ground pins 21/22 on the U1 socket and inj1 and inj2 LED turns on. I am so lost...
I referenced this site to help troubleshoot the injector driver circuit:
http://www.diyautotune.com/tech_arti...leshooting.htm
I have tested my injector circuits and everything checks out fine. I ground pins 21/22 on the U1 socket and inj1 and inj2 LED turns on. I am so lost...
I referenced this site to help troubleshoot the injector driver circuit:
http://www.diyautotune.com/tech_arti...leshooting.htm
#28
The misfire note seems a bit closer and smoother now. The revs are peppier. I wonder if my copper plugs are done from all the fouling and such.
I am now stuck between a rock and a hard place....
#36
As of right now, I checked for 12v on each lead on the 4 harness plugs and they checked out fine. I also checked continuity from the injector harness all the way to pins 32/33 and 34/35. Continuity as expected.
This leads me to the board. I have the MS on the bench hooked up to a Jimstim. I also have 2 injectors with the pigtails hooked up. The black wires is hooked up to constant 12v, and the green/white wires hooked up to injector bank 1 and 2 respectively.
Injector bank 2 is non responsive. This is my issue. What is weird tho, I tested the injector circuit by grounding pins 21 and 22 on U1 and the LED's for inj1 and inj2 turn on. Based on the link I provided above, this indicates the injector drivers are operational....
however, I don't think that is the case based on where I am at now.
#38
Boost Czar
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The injectors are run off the U4 IC. you probably should inspect how you build the board and see if youre not missing something on the injector circuits.
#39
I am currently focusing on the U4 IC and all other components to ensure continuity and that certain voltage values are present in on/off conditions.
When I was referring to LED, I was referring to the JimStim LED's that are marked Inj1 and Inj2, not the LED on the MS.
For testing, I connected an injector to the JimStim to replicate what is on my car. I hooked up one end of the pigtail to 12v and the other to Inj1 and Inj2 terminal on the jimstim. The injectors pulse on inj1 terminal which is expected. When I connect to inj2 terminal, NOTHING - no response or clicking.
To my luck, I shorted something on the JimStim while connecting the Injector and now my C1 and F2 are shorted (assuming) because they both get hot as hell after a few seconds of the jimstim being on. Then after a few seconds, the jimstim stops powering the MS.
Thanks for the help again. My plan to address the short on my JimStim so I can continue troubleshooting the U4 IC.
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