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

i had my MSII wired and the car was starting.. it didnt run the best but it started

my original wiring job was a poor one ( i made a 60pin adapter and the pins liked to fall out)

this adapter plugged into my stock engine harness (i simply unplugged the harness from my stock ecu and plugged it into my MS harness with my adapter.)

this time i wired the MS harness directly into my factory harness. I figured as long as my stock ecu was unplugged while im using megasquirt, all would be good. I guess i was wrong

When i have megasquirt turned on, i get power and i get the same readings from my coolant temp and intake temp sensors. so these sensors are wired correctly. I get a good reading from my TPS as well. It calibrated just fine. My wideband also works but this should t effect my starting.

my ignition is a single coil with a distributor. When i turn the key to the on position, my coil gets power and then cuts off (just like it always did, this was verified by my test light)

the injectors do the same thing, they do their priming pulse (verified by my test light, and i can hear it)

now when i crank the engine, i dont get spark or fuel. Tuner studio reads a fuel pulse width of 0ms while cranking and 0 ignition advance.

i know i have the distributor wired correctly. The power wire for the distributor is correct because the car runs with the stock ecu just fine. The grey wire (or white wire with the shielding around it for the dizzy) LOOKS to be correct. i dont see how it couldnt be. I have it pliced directly into the same wire it was before when the car started.

So im getting no fuel or spark when cranking even though i have power to the injectors and coil. Not sure how im supposed to verify the dizzy.. i know it gets power because the car runs all day long.

how this all made sense

Do you get an RPM signal while cranking?

i want to say i dont but i double checked that last night (double checked the wire that is)

i cant really remember as i didnt know to watch the rpms.. i was only watching the pulse width and the ign advance


I dont see why i dont though to be honest, if i dont have any rpms, i have all the wires hooked up correctly.

what wire on the MS harness is for rpm signal, i double check once i have that wire verified.

The RPM signal comes in on pin 24.

ill check it out as coon as i can. I got work that a friend passed away last night, ill be away from the car for a day or two. Thanks for the info and ill post an update when i can.

Sorry to hear that.

no rpm signal while cranking

this makes me somewhat happy because it now makes sense why the car wont spark or squirt fuel.

im going to check over pin 24's wiring and see if i can figure something out

ill post back when i have more info

Okay so i did a few tests


first test went like so. I had the MS plugged in and stock ecu unplugged

i put a test light on the spliced joint and grounded it to the battery.. and of course when i crank, i get no light.

i then unhooked MS and plugged my stock ecu in.. had the test light still on... cranked the engine and it DIDNT START!!! (weird because the car starts on a dime 100% of the time)

i remove the test light (effectively acting as a ground to the battery) and then the car starts up. this makes me want to think that when my stock ecu is unplugged and MS is plugged in that something is acting as a ground and not letting the current get to my MS

my pin24ignition wire for the MS is spliced into the stock ignition wire coming form my dizzy (wire normally goes to the stock ecu but i figured that sense the stock ecu is unplugged and the MS is plugged in, the wire would send its signal to the MS. (remember, the car runs FINE everyday on the stock ecu with MS unplugged.)


hope that made sense! ill get back at the car later, i need to do a few errands

ripped out the Shielded ign wire and stripped it down a little further and had my mom hold it in place while i cranked the car (injectors not wired)

car got a tach signal! but didnt start due to no injectors. So im not sure what was wrong with the original wiring but now its getting a tach signal even though its in the same spot. im going to solder it up and hook the injectors up and see if i can get things going.

it started before so it should start now.

I sure hope mom doesn't get electrocuted before you get the car running!

HEY NOW!!


she was fine and the car is running.

130mph @ 12.4 AFR

im calling it a night.. it needs some work but lets just say im driving it to work tomorrow confidently.