Matt Cramer

Try decreasing the plug gap or increasing dwell.

Ok. Check the voltage on the wire to pin 1 of the BIP373 with the key on, engine off, and let me know what you find.

That is correct. Is D14 on with the key on and engine off? It shouldn't be.

It should work to drive a relay directly.

Please double check to ensure you are not mistaken.

It's marked "Idle air solenoid / spare drive" in the above schematic.

What exactly is IGBTIN wired to, and what is spark output A set to in the tune file?

Depending on the part number, some of them don't really make a click. But they are generally 18 to 20 turns end to end and will not be harmed by too many turns.

All returns can be tied together. You don't need to use the black wire, or can use it as a distributor ground. It was really included for VR sensors.

You don't need a ton of thermal paste - just enough to fill in the tiny scratches on the heat sink and the back of the transistor so heat conducts across the junction.

If you want the MS to control the timing, either lock the distributor or use a crank trigger.

Jumper TachSelect to VRIN and TSEL to VROUT. The NA distributor uses a mechanical and vacuum advance (which are best locked out if you want to control spark) and six equally spaced trigger points.

You'll need to get an extra transistor; the kits come with the parts for a standard build, but not for optional circuits.

It's time for our annual MegaSquirt Meet, and due to popular demand we're going to 'bring it back home' to DIYAutoTune's HeadQuarters in Suwanee, GA (just NE of Atlanta) and let the meet 'return to its roots' a bit! The last two years we've combined the MegaSquirt Meet with the Classic Motorsports Mitty at Road Atlanta. The Mitty is a fun event, and we'll still be there this year sponsoring that event, but the meet is happening as a separate event here at DIY HQ. We'd love to see you at one or both events! Bruce and Al (original MegaSquirt designers) will be here for the meet, as will Phil Tobin the developer of TunerStudio and MegaLogViewer, and also James Murray and Ken Culver the MS2X and MS3 Firmware developers! We'll show off some of the latest goodies we've dreamt up and brought to life, and the code gurus are always interested in your feedback and ideas for how to continue to improve the MegaSquirt project as a whole and to better meet your needs so come and let them hear your voice! We'll have some Q&A sessions with members of the dev team, as well as presentations on the up-and-coming as well as how to get the most out of your MegaSquirt EMS! We have people come from around the continent and around the world to be a part of this event, don't miss it! Rumor has it we'll have a band out Saturday night, and we may get the dyno out and play a bit as well! Admission is free, come join us!

12 volt pull up, set up for Hall / optical input.

Sounds correct to me.

R57 should not be used on V3.0 boards. On V3.57s, it serves a totally different purpose - one of the few exceptions to the rule that they have the same schematics.

Why do you say that? If you're thinking of the R9 resistor on the MS2 daughter board, it was changed from 1K in the schematics to 330 ohms in production MS2s, making the two outputs schematically identical (a processor port driving the BIP373 transistor through a 330 ohm resistor). The problem I was working with on your install was that you had wired the board up to use D14 as the spark output, but set it for JS10 in TunerStudio. The result was that D14 was following its default behavior to blink (and fire your coil!) each time the injectors pulsed, at a constant crank angle.

This could be a case of firmware corruption; try reloading the firmware with the latest version, and making a new tune from scratch.

This is our latest standalone engine management: MS3-Pro with 8' wiring harness The MS3-Pro is able to run up to 12 sequential fuel channels and 8 spark channels. This is based on the MS3, but we've made several changes to make this the toughest ECU we can make it. Some are pretty obvious, like the AMPSEAL connectors and O-ringed plastic case. There's several internal improvements as well, other than putting all the optional extras in one compact package. We've got a more detailed list of its features at the link, but here's some of the highlights: - Traction control and slew control - Closed loop boost control for 2 separate solenoids - Nitrous control - Rally style antilag - Multiple table blending strategies - Supports 2 separate knock sensors with per cylinder knock detection - 8 gigabyte onboard data logging - And a lot more!

Check if the injectors are high or low impedance. Could you post a photo of how exactly the BIP373 is wired up?

What sort of injectors are you using? The PWM current limiting settings are rather weird. Also, where is the MS grounded? Motomanmike is right that you shouldn't see battery voltage spikes like that. And if you're not sure how the board has been modded for spark output, please post a picture.

That one has the MSQ in it fine, but no log. I'd need to see a log of the problem happening to see what's going wrong. Nothing in the tune really jumped out at me other than that the spark map is the default one for a small block Chevy, and that you'll need to make sure that the V3.57 is actually set up for D14 as spark output and not JS10.

The eMS-Pro can do PWM current limiting and incorporates a couple noise reduction features for it not in a standard MegaSquirt - that's why it has two separate 12 volt feeds, for example.

Could you post a copy of your tune file and a data log of the engine running? This would give me a bit more info about what's wrong on this one.