MicroSquirt.com read only forum (Jan.15,2018)

I have a very curious situation. MSII V3.0 that has run in our TVR w/ 2.9 24v Ford V6 (Cosworth) and after switching to alpha-n and back to speed-dens. and now it won't start.
In the datalog it says 0 RPM, but with engine bit 1 (running) which gives a pulsetime of 4.1 Msec. When starting it gives engine bit 3 (running and starting) where I would expect 2 (starting). Sometimes it wants to run which then gives engine bit 13 (start-up enrich + warm-up enrich + running) which would seem OK in this situation but then PW drops quickly. This would seem to be a mapping problem but it used to start and run with a similar map (not exact but very similar). I'm stumped.

There are several more inconsistencies in the log in which I've tried to only start the car. The log tarts out with just the ignition turned on.

Please have a look and comment as you like. I,'ve tried reflashing, another MSII, reflashing that one - nothing seems to work.

If anymore info is needed please let me know.

Cheers,

marc

Anybody????

Another thing is that I cannot get MSII to go below roughly 100 RPM's on the stim. Is this normal? Is there a workaround?
I need to be able to get the RPM's down to 0 in order to diagnose my problem.

Any help is welcome.

Cheers

P.S. Turbari and Marcars are 2 friends working on the same car in case anyone wondered.

More news; after reloading the firmware (first 2.33 and later 2.34) I get a message from Megatune saying

Ëxpected MSII V2.33 received SII V2.33

And later; expected MSII V2.34 received SII V2.34

Powercycle couple of times and now everything is fine ?!?

The PW is now 6.0ms without configuring anything, just installed code.

Anyone???

This is a stab in the dark.
Are you running EDIS6 on that engine?
You haven't by chance wired your tach source into the IDM wire instead of the correct PIP have you?

IDM gives a slow repeated pulse for key-on engine off which could create the symptoms you see.

James

Hmm, no. Thing is, it also does this when I apply power when it's out of the car, just like on a stim. Except on the stim I can't simulate this because I can't get the RPM's down to zero. So I just hook up 12V to pin 28 and ground (in my case) pin 11 and MegaTune diplays an injector time of 6ms.

Also the engine bit is 1, weird eh....

Thanks for thinking along though.

Made progress. The 4.1 and 6.0 was the prime pulse width. The engine bit is still a mystery though. I'll keep on searching.

Cheers

Marcars,

You are cranking at about 175 rpm, so there's no real reson why you'd expect to see less than 100 rpm.

However, you are sometimes dropping to 300 rpm, and this is invoking the cranking pulse widths (engine bit = 3 = 1 (running) + 2 (cranking)) and causing the engine to stall (not that at -30 you have a longer pulse width AND it is applied on every ignition event, greatly increasing the amount of fuel being fed into the engine).

So you need to tune the idle a bit better to keep it from dropping to 300 rpm or less, and it may help to raise the overall idle speed while doing this. Use the throttle stop on the throttl body to raise the idle speed by about 200 rpom. Then as you tune the idle, you can lower it.

Lance.

Lance, if only I was at that stage. The engine hadn't really run yet, let alone idle. But I've made more progress. James thought maybe I'd hooked up IDM which got me thinking (and looking) and it turns out I hadn't changed the wiring after switching from MSnS-E to MSII so I've got PIP coming in on pin 24 and SAW going out on 25. This is the stage where I really need that smiley that turns from yellow to deep red.

It did want to run though or at least made an attempt (maybe EDIS limp home mode?) but I don't recall ever seeing a pulsewidth at 0 rpm in MSI (MSnS-E) is this correct? Another thing that threw me off was erratic blinking of the Inj. leds on the stim which turns out to be the pulse per ignition event below max. starting rpm.

The car is in another location so I can't check anything now but as soon as I know more I'll post it here.

Thanks both of you.