The CAN chip is only there on an MS-II daughter card; it took over an output that the MS-I's base code did not use. MS-Is (including the MSPNP) have no CAN capability.

JS8 is what I'm using-- goes straight to pin11 in the proper location for the cap. Don't go higher than .1uf without proper testing, you could filter out the 2nd trigger altogether...


Guys-- this was the entire holdup on the MM9697. Some of he earlier cars have an occassional hiccup and some never even have that, but the 96-97 cars, about half of them at least, are nasty without this low pass filter cap (really it's a two piece filter circuit, but the resistor was already in circuit).

I spent days on the dyno with the scope ;). Fun stuff, but I was ready for it to be over... I'm SO glad it's nailed...

because the MSII board is different, see the notes below the diagram.

JS8 is our tach input on the MSI CPU.

think I geddit now.... cheers Jerry

Legend :bowdown:

I'm SO glad you nailed it, I wouldn't have had a clue how to figure that sucker out.

and now I have a completely missfire free car it's bliss :)

Would've been easier to solder the leg to JS8 too...... nevermind!

I realise that the boards are different, but I was confused as they use the exact same socket.

Matt was a big help in the process, as was James and even Bruce Bowling was brought in for his input along the way. It was an international effort ;).

And a great one at that. I was having the occasional misfire and this fix solved it for me too.

So...could we bring in our existing MSPNPs for you guys to do this mod, so we can run high-res? ...don't want to "void the warranty" (I'd pay the shop charges, of course)

On the earlier models if you're not seeing the miss with the standard code it's pretty likely you won't with hi-res, but we are more than happy to fit the cap for you at no charge. I don't think everyone will care to, and don't think it's really needed unless you're seeing an issue as it's the 96-97's that really had a problem here, and to a much smaller extent some of the earlier cars. As I said though we're happy to fit it for you at no charge. All new units going forward are going to have this in place, we're changing the spec right now.

You truly are a business for the people ;) Hopefully I can give HighRes a try sometime in the nearish future.

So just to clarify, by adding this capacitor, there would still be a benefit for the non-PNP megasquirt guys running the standard code (assuming they get the random miss)?

yes, I'm DIY MS and it's helped immeasurably. The Highres code is now usable again :)

yay, if i only had a car to test this with.

Going to try on Brad's as he has a mis in boost that didnt go away with cops.

My car is running sweet now on HR10d2. Thanks to the international effort! :bigtu:

Are you guys running unchanged maps with hi-res without any issues? Just easytherming hi-res, flashing, loading your old map untouched (maybe changing those 2 or 3 .01 values to .1 so as to get rid of the warning flagged in audit.log) and then you're all good?

Just curious on your results here...

Richy said he was able to lean his idle out substantially, dropping VE values like 10-15 to get closer to 14:1 with 550 high-z injectors.
I hope to do the same as well.

Any chance you'd feel like doing a write-up / how-to for those less electronically inclined? I can solder well, but I'm "slow" when reading wiring diagrams, etc - a few pics would go a long way. I'm not concerned about warranties - if I f'it up, I'm willing to shell out or beg for help to get the MSPNP fixed. ;)

Cheers!

Jeff

If you don't have a 96-97 you might not even need the capacitor. Try it without it first to see if you're having problems without it. Then go and void your warranty.

Uhm, yeah. Pin 19 it is.

I wish I could claim that I was too drunk to see striaght when I wrote that, but I just wasn't paying attention...