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

T_E_P

You should see:

MegaSquirt Download 2.00

Reading C:/Users/Lance/Documents/Websites/megamanual.com/files/code/Monitor_v2.920.abs.s19:
Detected MS-II (HCS12) code.
Entry point: 0x0000
Code range : 0x4000-0x3db3e0
File read successfully.

Opened comm port 1 at 115200.
Erasing main FLASH ...

Which code are you trying to load?

dexter72,

The behaviour you see is usually due to your TPSdot threshold being too low, and as a result accel/enrichment or decel/enleanment is being triggered by noise in the TPS signal. So you will probably want to raise that parameter's value.

What you see could also be caused by the MAPdot ...

Art,

You can probably get away with a shorted Q6. R24 and R26 should prevent shorts to directly ground (but there could still be a constant draw on the power supply). If this was mine, I would:

- remove or cut one lead of R24 and/or D14 to prevent a possible short of VCC (the 5V power supply) to ...

Nolan woodfin,

That's a very old stim designed for another EFI project that predates MegaSquirt (though EFI332 did involve Bowling and Grippo and others). So it is at least 15 years old, and was only produced well before documentation efforts began on MegaSquirt. As a result it has never been ...

142guy,

Did you see this: http://www.megamanual.com/mt29.htm#wb ?

TunerStudio should take you directly to the appropriate web page/anchor if you hit 'F1' while in a menu (and connected to the internet).

Lance.

142guy

Flow rate (fRate in the code) and engine displacement (CID) are used with "MAF Only" because we don't use VE or ReqFuel when we are using MAF (and this is not blended), instead the fuel pulse width is calculated from the air flow rate, the injector's flow rate and the displacement ...

ceralphs,

Putting resistors isn't likely to work, as the TPS code uses the rate of change of the TPS signal to set accel enrichments, and a resistor scheme would give a step function that would cause the rate of change to jump all over the place.

You may be do without the TPS entirely if your MAP ...

Dennis,

I don't see an instance in either log where the accel enrichment is being triggered inappropriately. Every time the AE is invoked the TP (throttle position) is moving substantially. I don't see any incidents where the AE is triggered but the TPS is not moving.

In the first log, the fuel ...

Dennis,

Backfires and stumbles sound like accel. enrichment issues to me. Have you tried tuning the AE? There is some advice here: http://www.useasydocs.com/details/us3tune.htm#accel Don't try to tune accel enrichments with the EGO sensor, it doesn't work well. Instead, tune for maximum engine ...

OctMatt,

I wanted to log an OEM engine's variables (like timing, air flow, pulse widths, etc.) a few times, and it turned out that the easiest way was to get a $20 OBD-II reader off eBay (I think mine is elm327 based), and there's plenty of freeware logger programs for these on the web. I used that ...

Aircooled,

The inputs on MegaSquirt are high impedance. That means they draw relatively small currents from voltage signals, and thus they can share voltage signals with other devices.

In general, where this doesn't work is sharing resistance signals (typically temperature sensors) between ECUs ...

Blazer,

That's how it is designed to work. During cranking, the fuel is squirted on every tach pulse. Once running, fuel is squirted based on the settings you have set for things like number of cylinders, alternating/simultaneous, etc. See: http://www.megamanual.com/mt29.htm#sc

Squirting on every ...

Will,

1) Yes, you can use the 0.001µF cap. The HEI will be a relatively low frequency input. High frequency inputs refers to crank wheel with lots of teeth (60 - 2 teeth, for example). However, the value of the capacitor is not that very important for a low frequency input. That is, too high a ...

keith,

This is a FAQ, see: http://www.megamanual.com/MSFAQ.htm#emissions

Lance.

leo,

You might be looking for the 'Additional Fuel' settings under 'Fuel Set-Up -> Other Fuel Settings' in the 2.920 code. See 'Fuel Response Time' at:

http://www.megamanual.com/mt29.htm#so

The code itself is here: http://www.megamanual.com/ms2/code.htm

Lance.

y,

You might want to read the notes below the same diagram here: http://www.megamanual.com/ms2/pcb.htm

Lance.

RCR,

See the tips on this page: http://www.megamanual.com/connect.htm#ms1

Lance.

mmorters,

That's great! I know how exciting it is to see the light at the end of a long project!

While you are waiting for an EGO senor, you can certainly tune the idle, warmup, and the accel enrichments as well.

For example, for the idle, you want to tune to get the minimum MAP kPa value at your ...

mmorters,

I have no experience of setting this the wrong way and ruining modules, but I do have lots of experience with the correct settings and no failures (on my 406 sbc). I imagine setting it the wrong way would be bad for both the module and the coil.

Lance.