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  1. S

    Please help with HPDI issues

    I sent the injectors to Brucatos. He said that they worked and flowed correctly, and replaced the orings. They did mention that one had a short in it, which they hadn't seen very often, but that it disappeared after cleaning. Mentioned that could be caused by injector driver or could just be a...
  2. S

    Please help with HPDI issues

    I am assuming you mean the pressure in YDS of the HP fuel pump? That's 675 at idle and 750psi at 1500rpm. YDS also does correctly detect switching from neutral to gear. Also, VST pressure is steady 50psi
  3. S

    Please help with HPDI issues

    I tested the stator as per the Yamaha specs and it is functioning properly. The coils are able to spark 1 inch consistently. Motor just running very rich and smoking. 60 seconds at 1500 rpm and the plugs are black. If I unplug the injectors wires from select cylinders, the rpm raises a bit and...
  4. S

    Please help with HPDI issues

    The voltage from the stator is very confusing. If I unplug the single green wire and measure the voltage, it's at 25 volts idle, which sounds OK. But if I plug it back and backprobe, its at 10v. The voltage on the two green wires going to the regulator is also 10v when plugged in but 25v when...
  5. S

    Please help with HPDI issues

    ECU actually. And from my understanding, rarely the issue but there's always exceptions
  6. S

    Please help with HPDI issues

    Agreed. Tomorrow I will measure the voltage coming from the stator also.
  7. S

    Please help with HPDI issues

    Spark looks orange and not very impressive from all 6 coils. I am suspecting the stator now. Anyone had experience with a weak stator?
  8. S

    Please help with HPDI issues

    Bought a new battery, coils and spark plugs installed. No change. I went out yesterday and idled around the river. Smelt really strong, not a raw fuel but like a 1969 Nova with no catalytic converter.......never went above 1000rpm. I also bought a spark tester to see how strong the spark is...
  9. S

    Please help with HPDI issues

    It reports voltage in YDS as within spec but you never know I guess. I got the coils today, spark plugs tomorrow.
  10. S

    Please help with HPDI issues

    It does have an O2 sensor. It tests OK and I cleaned the "sniffer tube". It was quite nasty. I will check the neutral switch operation thursday in YDS. I did have a problem with it before but I had it working last time I checked.
  11. S

    Please help with HPDI issues

    I also noticed that if I pull each injector wire (one at a time) the rpm picks up and smooths a little. This suggests to me a global over fueling situation, or inconsistent spark.
  12. S

    Please help with HPDI issues

    I'll check that in YDS for sure. I ordered 6 coils and 6 new plugs. After those things, i'll be at a loss.
  13. S

    Please help with HPDI issues

    Didn't work.....runs the same exact crappy way. I noticed that when I pull several spark plug wires, there isn't much/and effect on the way it runs even in gear
  14. S

    Please help with HPDI issues

    Got it in today, haven't had a chance to install it yet. If it doesn't solve the issue, the same seller has tons of mint parts that I may need also. Very impressed.
  15. S

    Please help with HPDI issues

    99yam40, I have been suspecting the Fuel Pressure regulator. It seems to be kind of of sticky, and I think it MAY be sticking and not allowing fuel back into the VST. I have a second hand Complete VST from a 2012 VMAX coming tomorrow. Same part number, and looks identical. It was taken from a...
  16. S

    Please help with HPDI issues

    Injectors were all in spec. Not the issue. Just a chronic running rich problem.
  17. S

    Please help with HPDI issues

    I found one of the spark plug wires had no continuity, was able to cut to fresh wire and reinstall the boot. That might be my latest starting issue, as it was cylinder 4, one of the only 4 that run at neutral. The injectors are all sent to Brucato and will test when I get them back.
  18. S

    Please help with HPDI issues

    Well, the only way to get the motor to run now is to start it and quickly put it in gear. Otherwise, it will stall out. I don't know why that just suddenly started happening. Still running rich, and still shutting off after a short while above 2800rpm. About to thrown in the towel I...
  19. S

    Please help with HPDI issues

    Well, today I removed the VST (again) and readjusted the float to sit a wee bit lower, switched to a different VST pump, removed the fuel pressure regulator and cleaned it up (seemed a little frozen up). I cleaned the needle valve and seat and adjusted the oil pump rod. It was about 1/8 inch...
  20. S

    Please help with HPDI issues

    Yup, it's official. I'm stooopid.
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