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

Fordfan,
I had the same issue. Ran 2.887 for years, updated to 2.891 and didn't notice that AFR was stuck in my logs. I did trace the voltage swing from the O2 pot all the way back to pin #28 on the processor board. So I figured it had to be something. I was going to post a question, when I came ...

That is true, didnt think of that. But your right, I could use the Req_fuel. I wonder if the fuel map or Req_fuel shows a change as the input from the Flex sensor changes?? That would make it easy to track and I could figure out how much change would be needed.
Thanks for the thought.. I will ponder ...

The bleed off return supplys a continious flow back to the tank. So I do have constant fuel flow. Whether or not it is enough, or my sensor was defective, is the question. I never got a chance to work on that problem. My first reaction is that the sensor is bad. It would show a constant 7% with ...

The problem I have is I don't trust the sensor. I watched it jump to zero at an interval of maybe 20 times in a minute. They say it will fail and go to 170hz. But it was jumping from 7% to 0% constantly. That would pull the timing offset in and out. That is how I found it, watching the timing ...

I know how frustrating it can be!! The best way to find your problem is using a dual trace scope. I picked up a Fluke scope meter and it was very valuable in understanding the circuit and what I was getting. I am using an MSD crank trigger and it worked flawlessly on my first MSII. The new one I ...

I am interested in using E85. I purchased a GM flex fuel sensor and had it in line with my return fuel and enabled the Flex Fuel option.
I found the sensor was intermittent, at times it would go from 7% to 0%. I realized I could not trust it, so I removed while testing the engine on the test stand ...

I am not familar with the hall type dist, but if it has three wires, is it possible that is uses 12v (or maybe 5v) to the + wire and the - goes to ground and the signal wire to pin 24?. I would look at a diagram for the VW and see if that is the case. Other wise you wont get a signal from the ...

Chris,
Glad to see that helped.. I will try the same thing on my combination. Could I see a copy of your msq? I would love to see what your AFR table looks like. I hope to be going to the dyno with mine at some point. Just need to get the bugs out. Once I get it tuned, I can share my msq with you ...

Chris,
my motor is in a boat, so it is a different animal than a car. The boat has a constant load at speed, and the throttle is very stable. Previously I found I had a tach signal variation of 120-250rpm above 4krpm. I chased it for a long while, but in the mean time I kept the motor running on ...

Chris,
what does your timing look like at idle and above?? Is it rock solid or does it fluctuate?

Reason I ask, is because I have been chasing a timing issue for 3 months now. I did find that when I used my older MSII, the timing is rock solid. If you are using the VR circuit, you may be having ...

I have not had a problem with downloads.. I think I am 2.88 right now and used 2.36 in my previous MSII.. Sounds like it could be a setting in the communications setup. Are you using a USB to serial adapter? Sometimes they can be a bit flakey.. I bought a newer one, Cables Unlimited usb 2.0 to RS232 ...

heathb,
looks like you are correct. The 8360 has an ignition module in it and must put out a square wave.. The MSD diagram I have shows the red to 12v switched and the black to ground and orange to the white wire on the 6A.. That orange wire would go to pin 24 on the DB37 and output of the MSII ...

heathb,

I am wondering which MSD dist you have?? I thought they all had the VR sensor.. for the BBC. If you have three wires from the MSD, then I am all wrong about it. Be interested to know the model of that dist.

I switched to the crank trigger, when I could see variations in my tach signal ...

heathb,
If you are using the MSD dist.. you should have the MS setup for VR input. Go to the mega manual index and look for the MSD6a. It explains alot of the setup and adjustments. I have been having problems with mine since I built my second MSII. I am using an MSD crank trigger, but have used ...

I use a stereo filter to clean up the DC..

SCOSCHE Single-Stage Noise Filter ES004.

There are various sizes available.

Anyone have a flex fuel GM car they can check the fuel line connections on?? Or does anyone know if it matters what direction the fuel flows??

Thanks.

Dick

I have searched and searched, can't find any reference to the fuel flow through this sensor. The lines are two different sizes, 5/16" and 3/8".
My question is, which one is the input and which is the output?? Anyone have an S10 with the sensor that can identify the in and the out??

Thanks!
Dick

My dwell is set to 25.5ms. So you are saying I should set it up this way, only changing the spark output?
Because the dwell varies and will change my timing. I could rev the motor to 3500rpm and it would stay steady. Not sure what happens above that rpm..

Ign Input capture... Falling edge ...

Wow!! I just read this post and the one referenced by TheMonkey. I went through this confusion last year when I was trying to set up my ignition. Or was it two yrs ago? Last summer I went from an eratic tach signal using the MSD VR in the dist to an MSD Crank trigger. I built a dist machine from a ...