JAW

[Bort62]

Alright, I got my JAW together and tried it out for the first time.

I get a calibration value of -46 no matter what I do, and I get a constant AFR of 10.18 when I hook it all up.

Any suggestions? The JAW forum appears to be completely inundated by spam.

 

[jamyers]

Like I'm an espert, but it sounds like your sensor is bad.

Most times I see folks on the JAW forums with problems, they're reading too lean / have heating issues - you're rich...hmm.

I'm sure the answers are all yes, but I gotta ask:
New (or known good) sensor WITH it's calibrated resistor still in the plug?
When you do the free-air calibration, is the sensor actually hanging in free air - and not in the exhaust pipe?
Double/Triple-checked all connections, including the sensor connector?

Did you go through the diagnostic routine:

JAW Diagnostics:
Heat-up Test:
With the oxygen sensor in free air, apply power to JAW and data-log JAW. Over a period of 2 minutes
while the sensor is being heated up you should see that AFR change from ~14.7 to 34.28, the Heat value
should also change from 255 to ~16. If you see both these changes happening then JAW should be 100%
functional.
Heat value stays at 255:
This means that the heater is not being properly powered.
- Check over your cable paying close attention to the wires from the “3-Gryâ€￾ and “4-Whtâ€￾ terminals on
the JAW screw terminals.
Heat value gets to 16 but the AFR is not 34.28:
-Your Free Air calibration value may be incorrect, perform a free air calibration and read the Calibration
value, the calibration value should be close to 0 for a well functioning sensor.

Can you send me a datalog of about 2 minutes of the JAW on w/ engine off? I'm wondering about the sensor heating.

What do you get when you manually put in a sensor calibration value of "0"?

 

[Bort62]

James,

Yes to all of your questions

I think I might have two issues here.

I calibrated the sensor in free air, and got the 33.xx AFR.

I then wafted some map gas over the sensor, and my AFR dropped down - so I think that's fundamentally working.

However, my cal value is a solid -46 or so. No matter what I do...

I put it into my car, and I get 10.18 the whole time no matter what. I think this may be because the oil seal on my turbo is leaking and I am probably filling the exhaust with uncombusted oil vapor, which may screw w/ the sensor.

 

[jamyers]

With a calibration value that far off, I'm wondering about your sensor...

Any way to put it on another engine?

 

[Bort62]

With a calibration value that far off, I'm wondering about your sensor...

Any way to put it on another engine?

Yeah probably. Didn't think of that.

It's a brand new sensor. Lame if it's bad...

 

[Anlushac11]

Post your info and questions also at www.turboford.net

Several of the guys on there are running the JAW kit. I am looking at it also.

BTW did you use the Bosch O2 sensor? I think it is specifically calibrated to use the Bosch sensor.

 

[Bort62]

Yes, I did use the bosch.

It has all sat in a box since I posted this - haven't got back around to it. I'll try turboford.net when I do.

 

[Patrick66]

i had a similar problem with mine, i would get constand 10.18 AFR and -127 heat no matter what. i set the calibration value to 0 to see if that worked, everthing is fine now. my heat worked and AFR went to 34.28, so i recalibrated a couple times and kept getting between -1 and 1. it averaged out to 0, so thats what i set it at. i dont know why exactly it worked, but it did.

 

[Bort62]

i had a similar problem with mine, i would get constand 10.18 AFR and -127 heat no matter what. i set the calibration value to 0 to see if that worked, everthing is fine now. my heat worked and AFR went to 34.28, so i recalibrated a couple times and kept getting between -1 and 1. it averaged out to 0, so thats what i set it at. i dont know why exactly it worked, but it did.

That's great to know - I'll give it a try.