AEM uego controller may have died. What do you think?
 

Unnecessary intro:

My AEM wideband hasn't been reading correctly for a while. It was working properly when I used the VE analyze to autotune, but I noticed it would read inappropriately at times. On my way back from having my transmission installed I decided to hook up the laptop and monitor everything on the drive home. The wideband wouldn't read any higher than 10.3. However the car was running like a champ because I already had the fuel tuned pretty nicely.

To the point:

Todya I removed the the sensor from the exhaust and let it hang freely. With the ignition turned on it was giving an AFR of 9.5. Fortunately I have a backup sensor on the shelf so I put it on. Same reading 9.5. I used voltmeter to check the output voltage at the diypnp and the output of the uego controller. ~1.2v, which corresponds with the 9.5 reading.

So it appears that the box itself is now outputting the wrong value. It has worked in the past with the current wiring configuration. My last option is to check every inch of wire between the sensor and controller for compromised wire.

If it is broken, then I'm torn. I have two good wideband sensors, but it might be a good idea to go to the lc1. I know people have issues setting up the lc1, but once done it seems stable.

Any opinions on my situation? I guess tuning this weekend isn't going to happen. :(

I would just get another aem. Just my opinion, but the lc-1 has the potential of being a huge bitch to even get working properly.

Im not sure what happens when the gauge/controller goes bad, but I can tell you for a fact that when the oxygen sensor goes bad the A/F readings will almost always display 14.8 - 15.0:1 and not oscillate much.

AEM said they had the parts to repair it, but it would cost $100 to $200. I decided just to replace it with a gauge type. It will be nice to be able to see the afr in real time.

http://www.14point7.com/SLC-Pure-Plus.php

or if you want to save get their DIY slc

That looks pretty badass. I'm sure if it does what they claim, this will become very popular very fast. Anyone using this?

They need to make the display remote mount so you can store that big ass box under the dash. Other than that it seems fine. How expensive are the o2 sensors for that unit. I know I heard talk about the MS folks trying to incorporate a wb02 system in the MS so that it could use the cheapest sensors available. I don't know if that is still in the works, or been laid to rest.

Also, you can get a brand new AEM gauge type for $180. I think a diy system needs to be accurate, reliable, and around $120 to really take over the market

well the DIY setup is 99 and the sensor is 50 for a replacement. The one I linked to is together unit.

Bowling & Grippo outlined the status of that project at the MegaMeet earlier this year. It's a rather different approach to wideband design, as their controller is meant to both pass on what air/fuel ratio is measured as well as the controller's predicted level of accuracy. It both passes on error codes that can tell the ECU to suspend feedback as well as notes on whether the sensor is being pushed out of its recommended operating range (excessive temperatures, etc). The first version is likely to be integrated into a MS2 Sequencer, which also isn't dead, just waiting time on a production line that's much busier than expected.

Good, I'm glad the new stuff won't only be for MS3.