MS3X V3.57 NA6 Stock – No start, normal cranking, no RPM signal
This has been quite a learning process. Once I got past the harness adaptor (MS3X 90-93 - Assembling harness adaptor (grounds)), the installation went smooth until first startup. I posted I’ve spent at least 40 hrs searching and reading for possible solutions to my no-start to try to figure it out on my own – I feel I’m at the point where I've extended my own resources and need some help to continue on (I'm much more confident in tuning the car)…
`90 Chassis, stock internal 1.6
I/H/E, AFM-delete, wired for sequential fuel, stock coils/CAS
64-pin DIY adapter connector (MS3/X DB37 to 26- and 22-pin factory harness plugs), wired per Frank’s guide
Innovate LC-1/XD-16 WBO2
Followed much of the forum and DIYAutotune setup guides for initial MSQ settings, sensor calibrations, etc.
Engine cranks normally, fuel pump operates, confirmed spark present by removing a plug attached to wire while grounded, but will not fire. A couple of backpops through the intake if I prime too much. Composite logs appear to show cam and crank signals but lots of sync loss. And no RPM signal (I understand the engine will not run if it does not see RPM).
Triple-checked harness adaptor wiring – confirmed 12V at 1B, Main 24 at 2E (CKP in), MS3X 32 at 2G (CMP in), Main 1 at 2C (Sensor GND)
IAT, CLT, TPS, MAP calibrated and reporting good values
Adjusted pots R52, R56 (Main) and R11, R32 (X) to output ~2.5V at pin 3 of U7 on each board
Base timing was/is 14* prior to MS3X (obviously haven’t adjusted base timing yet)
I've attached a Composite Log, I/O and MS3X pins lists, log of cranking, and the .msq of the current tune. Please let me know if there is any other information to provide to help troubleshoot this.
Much thanks, Matt. Switched Ignition Input Capture from Falling Edge to Rising Edge, fired after some coughs to clear the fuel sitting on the piston tops. I didn't save the Composite Log of cranking after I did this, but sync losses completely stopped, and "RPM SYNCED" was solid ON during cranking, "NOT RPM SYNCED" when ignition ON.
If you don't mind, help me understand why I needed to do this.