MSefi.com read only forum (Jan.15,2018)

Bingo! I finally got around to replacing the pickup sensor. Problem solved.
Thanks for the help.
Wayne

I have wondered. When I could get no signal through the HEI 7 pin, I checked the voltage of the VR sensor and got 3 volts AC. But I did not notice if it was slow to come up. They are not too expensive. I guess I will try changing it. Thanks

No, everything works fine on stim. I immediately have tach signal when I plug it in. Can I imitate cranking somehow on stim? If the engine dies and I crank without turning the ignition off, it starts immediately. If I turn the key off first, I have the delay. Engine hot or cold - the same.

Hi Matt. It has been a while since I have been able to work on this problem. Had to fix a gas leak in the tank. I tried increasing the skip pulses from 3 to 5. Did not seem of have much affect. I can better describe what is happening. If I get in the car and just start crankin,g the engine it will ...

Hi Matt. I got the modification done to Q9 and Q12 on the MS-II. It helped steady the tach signal. It maybe wanders around 30 RPS now, and the USB communications with Tuner Studio is much improved. No change to the lack of tach signal when first cranking though. I checked the voltage at the VR while ...

I guess then they just succumbed to age, a problem I also have.

I think I will go with the fix to Q9 and Q12. Somewhere in the literature I saw a fix for noise for low impedance injectors with a resistor and capacitor in series across the injector terminals. Would this help as well? What parts would I use? Wayne

Problem solved. I did have the stepper motors wired backwards. The diagram in this forum intro. is right for my application. When I tested the motor it first extended then retracted; just the opposite as it was supposed to. Also the IAC table is opposite to what I thought. so, I probably bottomed ...

Thanks Matt. This sounds easy enough. I assume this source would be hot in run and start. Is there any advantage to low impedance injectors? They are a lot more trouble than high impedance injectors. I remember in the v3 board assembly instructions it said you could add resistors to low impedance ...

I built the MS-II with v3 board and 2.9 code. I am running it in a 1984 Camaro with crossfire injection. I was setting the IAC steps trying to slow down the idle before I realized I had a pretty large vacuum leak. From the marks, it looked like I might have bottomed out the pintil in the throttle ...

Hi Matt I got some more data. I disconnected the injectors so I could get a longer cranking log. With the injectors disconnected I did not get a communications shut down.
I checked batt. voltage with my muitimeter: At the battery 12.18 volts, at the battery cranking 10.24 volts. At the ecu 11.70 ...

Good morning Matt. From DB37 #s 8,9,10,11,& 18 are each grounded separately to the engine block. All sensors including the knock sensor go back through #19. The injectors are low impedance, 3 ohms each. I will try to get a better log while cranking but until I solve the communication problem its ...

Here you go - thanks

thanks Matt for responding. Here are the data logs the best I could get them with the shut downs. I don't Know what an MSQ is? Meanwhile I see if I can get a better USB cable. Any shielding I can do inside the case?

Thanks Wayne

MS II, v3 board, MS tune 2.9. I have a 1984 Avanti with a SBC 305 with cross fire injection. Yes that is stock.
I built the Magasquirt kit and stimulator with no problems. It all worked well on the stimulator. But I originally had it set up to use the 7 pin hall sensor module that was standard in ...