MS-II Map Switching

[Assmatic]

After installing the MS-II and getting it tuned and everything, the car will start up on it's cold cycle running fine, then will move to it's warm cycle and after 3-4 minutes on Idling, it switches back to it's cold cycle and destroys the Spark Plugs. This ONLY happens when idling and after 3 or 4 minutes.
Everything else functions fine, the car runs great, all the dials are reading correctly, the temperature sensors are fine...I can't figure out why it would do this? I've never seen another Standalone ECU do this before, Is there a simple command for it to overrun this?

It basically switches from it's warm cycle MAP to it's cold cycle without any reason what-so-ever. Anyone had this happen to them before?

All help is much appreciate, Thank You.

 

[VelocitàPaola]

What you're saying doesn't quite make sense... from your description, it sounds more like you're having issues with the warmup enrichment (WUE) and afterstart enrichment(ASE). It sounds like your settings for either, or both WUE and ASE are wrong:

MS2-Extra Conversion Manual

Have you tried looking at others' MSQ files?

MSQ File Repository - SymTech Laboratories

 

[Assmatic]

All that is fine, but the ECU seems to be switching back and forth between that Warm up Enrichment and After Start Enrichment Cycle. The numbers on both are fine and tuned properly but it doesn't want to stay on one for some reason...

 

[VelocitàPaola]

It would help if you could post a datalog and copy of your MSQ file.

 

[jrohner]

Bad connection to the coolant temp sensor?

 

[96TurboGS]

I've seen weird issues like this whenever there is a high ASE taper (<1600) with a high WUE and ASE %, the counter would reset itself several times before ramping down to WUE percentages. Resets can also cause the timer to reset itself. What code version are you running? Posting a Datalog and MSQ would help us all.

 

[Assmatic]

It's the MS-II Extra version, I have to see if i can get the logs Monday because it's up at my buddies shop and he's closed on Sundays. It doesn't seem like a unbearably hard to resolve issue however? To put my mind at ease I've just never heard of this happening before or seen this happen before

 

[VelocitàPaola]

It's the MS-II Extra version, I have to see if i can get the logs Monday because it's up at my buddies shop and he's closed on Sundays. It doesn't seem like a unbearably hard to resolve issue however? To put my mind at ease I've just never heard of this happening before or seen this happen before

It's definitely a tuning issue, which of course can be fixed. We'll know more once you provide those files.

 

[Assmatic]

Ok I will try and post it tomorrow, if he doesn't figure it out by then thank you for the responses

Well he ended up fixing it and I didn't get a chance to get the full detail but it had to do with the Idle control interfering from the stock ECU and the MS-II (odd) but was a simple wiring fix.

Other than that is there any reason why the ASD Relay would be shorting out the Alternator on the car? It clicks every time i turn the ignition (which i assume would be normal?) Other than that I'm not sure what could be the cause.

 

[VelocitàPaola]

How is the ASD relay shorting the alternator? What is it doing specifically?

 

[Assmatic]

I'm not sure if it's the ASD or something else, but when you go to start the car you hear a clicking on and off coming from the ASD which the MS-II is hooked up to for power.

The Alternator's core keeps getting fried each time the car is started up. Everything is wired fine even SymTech recommends wiring to the ASD but this clicking noise started after the two were wired together so that's the only spot we can figure. The alternator is at a place being rebuilt and having him take a look and see if he can find the problem, but I can't think of anything else that would be frying it because nothing else leads to the alternator?

 

[VelocitàPaola]

I'm not sure if it's the ASD or something else, but when you go to start the car you hear a clicking on and off coming from the ASD which the MS-II is hooked up to for power.

The Alternator's core keeps getting fried each time the car is started up. Everything is wired fine even SymTech recommends wiring to the ASD but this clicking noise started after the two were wired together so that's the only spot we can figure. The alternator is at a place being rebuilt and having him take a look and see if he can find the problem, but I can't think of anything else that would be frying it because nothing else leads to the alternator?

Is the Megasquirt ECU controlling the ASD relay or just drawing power from it? If it's drawing power from it, there are better places for doing so. The black/white wire going to the ECU carries +12V from the ignition switch.

I don't really know how Megasquirt could damage your alternator unless you somehow shorted the field winding to ground.

 

[Assmatic]

It was just drawing power from the ASD, which i think was the source of the problem. We're going to re-wire it to the wire you mentioned, and it sounds like that should solve the problem, thanks again

 

[96TurboGS]

I've seen weird issues like this whenever there is a high ASE taper (<1600) with a high WUE and ASE %, the counter would reset itself several times before ramping down to WUE percentages. Resets can also cause the timer to reset itself. What code version are you running? Posting a Datalog and MSQ would help us all.

There is a bug in the 2.1.0 release all the way to the current 3.0.3r regarding a high taper value.

I figure I'd update this since jsmcortina (one of the developers) found the ASE bug. It was in fact a timer overflow that occurred if a value was selected over ~1500 to 1600 taper cycles. Release 2.1.0c is now replaced by 2.1.0d. So if anyone has problems with tapers resetting several minutes with a value, then this could be your problem.

Megasquirt MSEXTRA and MS3EFI &bull; View topic - MS2/Extra release 2.1.0d released