Advance showing 53.5 degs

[Brianp6040]

I have a friend who has designed and installed an EFI system in my 1957 Jaguar Mark I. Had it starting and running like a dream. Had starter problems and replaced the flywheel and starter (shouldn't be relevent but wanted to enter that part becasue that was the only change). After completing the starter and flywheel change out, was no longer able to start the car (starter was working fine but the car would not start). On the laptop, Megasquirt was showing that we needed to set the distributor at 53.5 deg advance. We are using a 7 pin GM HEI, have checked our vacuum ports, connections, everything. I am obviously not an experienced mechanic (my friend is and this is his 4th installation). Anybody see anything like this before? Thanks. It is brand new a Megasquirt II we are using.

[Matt Cramer]

Please post a data log and MSQ.

[Bluehaze]

Me too, this is my first install, but also, to get my real world timing to match the MS advance, I had to set mine to around the 50 degree mark. I'm running the simple distributor/reluctor pickup and MS driving the coil direct. Still tuning in the driveway, and still trying (with gradual success) to have the lowest, smoothest idle. I lined the dizzy up with the "Just past" the reluctor peak (About 10deg.) which set the rotor's trailing edge to the #1 HT tower and the crank at TDC.
Im running MSII version 2905 software.
Thanks in advance.
Richard

[Bluehaze]

Well then, seeing as how I could not get the whole advance ting out of my head, I went away and thought about it, read more,and more thinking. Funny how the EFI learning trip has had me almost hurting in the brain department with the amount of learning I've been doing lately! Oh wait a minute, perhaps all that revving my car in the shed has just made me woozy.
Back on topic, I tried setting my Ignition capture to falling (not rising), and re-set my offset to 10 degrees, and hey presto! All fell into place. Also, the timing mark on the crankshaft is as steady as a rock, not dancing about like before. This, I will assume is due to the fact I'm now catching the sharp transition of the reluctor output, rather than the less defined shallow build-up. Oh and the motor runs a lot smoother now.
Maybe when you put your motor back in, some wires from your dizzy pickup were transposed.
I hope this is helpful, Im still a newbie. If this fixes your problem, then this is my first time helping someone else.