Megasquirt Mayhem. Please Help.

[nando]

did you calibrate the Megasquirt curve yet?

[Chabs]

just did it, and now im getting readings in between 2 and 3. when i revved the engine it dropped to about 1.5 for a split second and the car almost died..

its running VERY rich, the exhaust smells like gas.


what... the fuck

[nando]

awesome, just downloaded the instruction manual. the owner before me didnt know anything about this stuff, and it says to calibrate every 10 000 miles or twice a year. it was DEFINITELY not done.

i'll let you know how it goes,

thanks a lot.

you also need to calibrate the sensor in megasquirt. It's under the Tools menu - Calibrate AFR curve. make sure your project is set to wideband and not narrowband..

[Chabs]

awesome, just downloaded the instruction manual. the owner before me didnt know anything about this stuff, and it says to calibrate every 10 000 miles or twice a year. it was DEFINITELY not done.

i'll let you know how it goes,

thanks a lot.

[nando]

with the serial cable it came with. If you don't have the CD that came with it anymore, you can download the instruction manual from Innovate. It tells you how to set everything up. :)

I really doubt the sensor is bad - even if it were, the default programming doesn't read below ~9:1. 4:1 is so far off the chart it has to be calibration.

[Chabs]

haven't connected it to the innovate.. how would i do that? is it possible that i need to replace the o2 sensor?

[nando]

have you connected directly to the Innovate to see what it's reading? I'm willing to bed your AFR calibration in Megasquirt is wrong or hasn't been done.

[Chabs]

innovate wideband

[nando]

That has to be an error, either in the calibration of your sensor or the sensor is bad itself. Usually you don't read below 10:1. What sensor do you have? Wideband or narrowband?

[Chabs]

4? do you mean 14? if it's reading 4 you haven't calibrated your O2 sensor correctly.

it was at 14.7 but once it heated up, it dropped down to 4 and at some points even 3 or 2, its kindof surprising that the car was still running.

[nando]

4? do you mean 14? if it's reading 4 you haven't calibrated your O2 sensor correctly.

[Chabs]

okay, got the car started, loaded another tune and it worked. however while we were experimenting yesterday and screwed up, we were trying to fix this weird thing my car is doing.

when it runs smoothly, the AFR at idle i hovers around 4, however it switches every once in a while, not sure why, and drops even further. anyone know what the problem is?

[gearheadE30]

You may have to rewrite the firmware. Did you try flood clearing it when it was flooded? If it caught, it would eventually run for a very short time, and you would at least know that ignition was working correctly.

[Chabs]

did you by chance change a setting that was highlighted in red?

noticed those at the bottom, but didnt touch any of them.

[nando]

did you by chance change a setting that was highlighted in red?