1990 1.6L MS3/ M3x 1st start issue / base timing - Miata Turbo Forum - Boost cars, acquire cats.

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Old 08-08-2012, 11:55 PM   #1
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Default 1990 1.6L MS3/ M3x 1st start issue / base timing

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.
Attached Files
File Type: msl 2012-08-08_18.28.56.msl (88.1 KB, 91 views)
File Type: msl 2012-08-08_21.14.32trig14.msl (110.5 KB, 93 views)
File Type: msl 2012-08-08_21.17.36trig.0.fixed.14.airtempadj.msl (113.1 KB, 103 views)
File Type: msl 2012-08-08_21.17.36trig.0.fixed.14.msl (106.5 KB, 94 views)
File Type: msl 2012-08-08_21.17.36trigneg16.fixed0.msl (1.23 MB, 107 views)
File Type: msq CurrentTune.msq (160.7 KB, 94 views)
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Old 08-09-2012, 09:06 AM   #2
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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?
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Old 08-09-2012, 01:26 PM   #3
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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.
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Old 08-09-2012, 07:40 PM   #4
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emailed you the fix.

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