Spartan 3 Stuck Full Rich

Are the testing procedures for the Spartan 3 V2 with CAN functionality the same as those for the Lite?

My Spartan 3 is hooked up to the CAN bus on my Megasquirt 3 Pro Mini and it functioned fine for some time, but has since become stuck at as rich as the gauge will read. I replaced the sensor today thinking it would be that simple, but it would appear as though there is more afoot than just a bad sensor.

Thanks in advance.

Yes, the same tests for Spartan 3 Lite apply to Spartan 3

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Terrific. I’ll get all of those tests done in the next couple of days and report back.

I get proper voltages with the unit powered up.

I thought I had a spare sensor, but the connector doesn’t match the unit. It must be a 4.9 sensor I got from you with a previous kit for one of my other cars.

I would really like to avoid pulling the sensor again, as it’s a pain to get at and it’s cold out. Is there a recommended make and model car I could get a sensor for at the local parts place in town?

I’m going to see what voltage it puts out with the unit powered on and the sensor plugged in shortly.

I just ran the car for a bit, and it put out 2.35 volts with virtually no fluctuation even when revving the car up. I cut the idle fuel by half, which caused the car to just barely run. Still 2.35v coming off of the green wire.

ETA: With the car not having run in over an hour, I powered up the unit. It stayed at the same 2.35v for about 35 seconds and then went to .o1v.

Look for Bosch 17025

Will do. I should be able to pick one of those up at the local Oreilly Autoparts. I’ll report back when I have the rest of the tests done. Thanks for all the help, and have a Merry Christmas.

I checked today with the new sensor. It heated the sensor when I powered it up. I was able to once again see that it gave the proper voltages on the green wire upon powerup. It stayed at 2.35v for approximately 35 seconds before dropping down to .01v where it stayed.

What does all of this indicate? What should be my next steps.

Can you private message me with your order number?

I believe I just did that correctly. Please let me know if you didn’t receive it. Thanks.