1990 1.6L MS3/ M3x 1st start issue / base timing
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I'm having a bit of trouble starting my car - it's the first start after installing Megasquirt.
Details: 1990 1.6L, all stock from the airbox to the cat. No turbo, no COPs, no AC. Timing is set to 14btdc- on the stock ECU, this starts easy and runs strong. Parts I've changed from Sunday to now: -Wells TPS -GM AIT -jumper wire for fuel pump added to the AFM plug -Map sensor hose -Innovate LC-1 wired to ms harness -Brain built harness to plug in factory wiring -registered Tuner Studio -I did the LC-1 first, calibrated it in fresh air, then installed. -Connected laptop to USB, got a reliable connection with TS -ECU Definition: MS3 Format 0238.002 -calibrated TPS, added the GM IAS and the Miata CLT -selected LC-1 for my 02 sensor -set 'Fixed Advance' to 10 First turn of the key is a very labored cranking, and every 5 seconds or so, a back fire. It's like the base timing is way off. I can smell some fuel. I'm reading as much as possible, but I started to take few stabs in the dark with the Ignition Options/ Wheel Decoder settings. See attached logs. At first, I left the settings alone: Trigger Angle -16 Timing for Fixed Advance 10 Cranking advance 15 Next Trigger angle +14 Timing for Fixed Advance 10 Cranking advance 15 Next Trigger angle 0 Timing for Fixed Advance 14 Cranking advance 15 I also noticed my air temp gauge was showing ~28*, so I recalibrated it Next Trigger angle 0 Timing for Fixed Advance 14 Cranking advance 0 Next Trigger angle -16 Timing for Fixed Advance 0 Cranking advance 0 None of these started it, the ones where the Fixed advance was 0 felt like it was spinning easier (not as labored). Am I in the right ballpark? Is 'Fixed advance' the one I want to be messing with? Should I try going negative with that number? Any suggestions? I'd prefer to keep the CAS timing right where it is - I know this engine works well with the Stock ECU there. Also, since I'm such a noob to MS, if there is a particular field that you'd like me to log, I can get you those tomorrow after work.:noob: |
There's little point to moving the trigger angle around. Are you RPMs in TS reading constant when you are cranking?
can you click on the diagnostics tab, start a composite log, then crank for about 15 seconds and post the screenshot of those results? |
Sounds good. I was guessing that it was a timing issue, that's why I started playing there first.
I just checked the logs that I do have (cranking for a short time), and the RPMs do seem to fluctuate. They're about 300-ish, then you'll see a quick spike downward - theis is where it felt 'labored' or out of time. The battery was getting tired of all that cranking, I did throw it onto a charger during the course of taking the above logs. I'll post the screenshot tonight when I get home. Thanks for the help. |
emailed you the fix.
:brain: |
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