'90 MS2PNP Crank, no start with data
 

I got my MS2 in, updated the firmware to 3.4.4, and downloaded the 3.4.4 basemap. Calibrated CLT to RX7 AFM, and IAT to GM. Fixed the timing, and set it to 10*. All it will do is crank, but no start. Can someone point me in a direction to look? Data log and tune are attached. Engine has no mods, and the IAT is just laying in the airbox right now. I do have spark on all 4 cylinders and I also smell fuel.

I had a friend look over my log/tune and he thought it looked ok, but that my timing was off. I’m not really sure because I verified and set it at 10* (no offset was on 10), but i’ll do that again as well as mess around with the offset,m. How high/low is it safe to go on the offset? I went +/-9* yesterday and that didn’t change anything, can I go to +/-20?

Tried changing timing +/-20*, nothing. Played with the cranking fuel amount in the fuel VE table, didn’t help. I’m charging my battery now becasue it’s getting a bit low, my cranking speed was around 238, it’s now dropped to 190. Hopefully a charged battery will help but the battery was charged the first startup so it should have started anyways.

Culprit found! Fuel pump is not priming, I pulled the cover on the parcel shelf and it’s dead silent. Dw200 and a new filter on the way, but I won’t be able to install them till the 29th or so. Hopefully that solves all the issues :)

Bad fuel pump explains why my AFR read 18.9, why none of the timing or fuel changes made any difference, and why when I accidentally swapped my plug wires nothing changed.

Solved!

Jumper between FP / GND in the diagnostics box worked. But why isn’t megasquirt controlling the fuel pump? Jumping between pins 2 and 7 on the AFM makes it sputter a bit, but it won’t fire up. How do I make MS control the fuel pump? I did remove ST SIGN fuse before installing the MS.

I spoke to Matt at DIYAutotune and shipped it off to him. He should be able to fix it, we determined that it’s something with the ecu that’s faulty