A few months back my MSII v3 took a dump. I drove the car the day before. Then the very next day I was getting ready to leave for work and it wouldn't pop off and when it did it ran terrible. At first I thought it was the new tune so I swapped back. Nothing changed. Still wouldn't start and run well. So i had to push the car back in the garage and take a different car to work. Then that afternoon I substituted my backup MSII v3 and the car fired right up!
So now I have finally gotten around to hooking up the malfunctioning one to the stim at my desk here and when I get the rpms past the 300 rpm cranking limit the pulse width drops to zero!
I need help I don't know where to start checking. I'm great at soldering things together but trouble shooting circuit boards is not something I'm very skilled at.
Please help.
Injectors stop firing after cranking rpms exceeded
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Injectors stop firing after cranking rpms exceeded
Could you make a data log of the pulse width dropping to zero on the Stim and post that, along with your MSQ? I suspect it's a problem with firmware corruption or settings. You may be able to fix it by reloading the firmware and loading an MSQ from before the problem happened.
Re: Injectors stop firing after cranking rpms exceeded
Here you go. Let me know what you think.
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Re: Injectors stop firing after cranking rpms exceeded
Well, I am a newbie here, but I do see that your MAP never changes. It looks like it may be disconnected. I don't fully understand the entire fuel calculations yet, but that can't help...
Oops, my bad, I see you are running on the stim...
Oops, my bad, I see you are running on the stim...
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Injectors stop firing after cranking rpms exceeded
Those files show no good reason this should be happening, so my guess is corrupted firmware. Try reloading the firmware and re-creating your tune file by editing the settings it loads with the firmware - do not load an existing MSQ. Let me know what results this gets.442olds wrote:Here you go. Let me know what you think.
Re: Injectors stop firing after cranking rpms exceeded
I think the problem may be that your map and tps sample rates are set to 0. Mine are set to 25 ms. Not sure if that is the default or not.
1986 Nissan Stanza Wagon 4WD, CA18DET, GT2860RS, 850cc Injectors, Microsquirt, Shuttle XS35GT Carputer
Re: Injectors stop firing after cranking rpms exceeded
Thank you very much, the new firm ware did the trick. I wish I would have thought to do that in the first place.