Spartan 2 and Bosch 4.9 Problem, const. AFR = 16.0

[Patric Kiral]

Hi,

I ordered the Spartan 2 controller with the Bosch 4.9 Solenoid plugged it to my MS3PNP PRO and i get Wrong readings.

The startsequence and calibration are working fine, first few seconds AFR=13,3 and then AFR=16,6. But after the starting sequence the AFR Value is a constant 16 no matter what i do. Please Help me. 

Greets from germany

Patric

[Patric Kiral]

this is a video of its behaviour.

https://goo.gl/photos/fDGA5X5YZrqwpn386

[Greg Deputy]

Did you ever get an answer here?   I'm wondering if this is a normal failure mode, i've been using my spartan2/bosch49 for about a year or so, and it suddenly went to a constant 15.2 AFR.   Trying to figure out if i should just replace the 02 sensor, or if there's other troubleshooting i can do.

[Alan To]

 Hi,

Please try the following:

1. Remove Sensor from exhaust
2. Connect the sensor to the wideband controller and power on the wideband controller
3. Wait about 2 minutes, the sensor should get hot (be careful), please confirm it gets hot
4. With a cigarette lighter, give the tip of the sensor some gas, do not light the gas. With enough gas, the wideband controller should output max rich (~10AFR), please confirm this.

 

[turbow...@gmail.com]

Alan,

(I also emailed you)  I bought two of your Spartan2 units at the same time (around 8/13/18).  Just now installing and I am having same result as Patric.  Boot appears fine, 0, 1.66, 3.32, 4.98 and then stays at 4.95.  I just tested the second sensor which was not installed yet.  At key on sensor started at 74*F,  30 seconds was 85*F on the tip near the threads, 1 min. was 95*F, 1:30 was 98*F and min it was 93*F.  Voltage reading on green wire 2.88v.  Addition of gas from pocket Cig lighter no change.  Tried MAP gas and no change.  Tried Oxy/acylene and no change.  It never wavers off from 2.88v.  Both controllers and sensors seem to yield the same results, neither seems to be working.

Walt

[turbow...@gmail.com]

Correction, I bought my pair on 9/18/18.

[turbow...@gmail.com]

Patric,

Give this a try:

-during initial power up, spartan should read 1.66v for the first 5 seconds, during the next 5 seconds it should read 3.33v, then 4.98v  (these are voltages on a volt meter, not AFR in the MS3 - Looks like the MS is outputting the correct readings to match those voltages)

-After spartan is heated up, ~2 minutes after power up, in free air the output should be ~5v

Then you can do a gas test:

1.      Remove Sensor from exhaust

2.      Connect the sensor to the wideband controller and power on the wideband controller

3.      Wait about 2 minutes, the sensor should get hot (be careful), please confirm it gets hot

4.      With a cigarette lighter, give the tip of the sensor some gas, do not light the gas. With enough gas, the wideband controller should output max rich (~10AFR), 

My two brand new units (bought the pair in Sept. 2017 but just now installing the first) units both pass self test but fail the gas test.  I tied Bic Lighter, MAP torch and Oxy/Acetylene torch.. all stayed at 4.95v (20:1). 

I called and spoke with Alan @ 14point7.  He is sending out a pair of replacement sensors & controllers, so we shall see when they arrive.  I'll test both sets with lighter gas and hopefully they work without issue.  I would suggest you give him a call, perhaps you are seeing the same issue I have?