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Thread: afr offset in nismotronic

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Posts: 1-7 of 7
2015-09-28 16:14:55
#1
afr offset in nismotronic
Ok, I thought i'd start a new thread about this issue as it kinda came up in my boost issue thread (thats been solved, over thought it).

So I'm currently having issues syncing my afr offset between my aem uego wideband and my nismotronic. My wideband gauge at idle is reading full lean, the afr gauge in nismotronic reads 11-12ish. I've been told it's most likley a ground issue so I went ahead and re-grounded my wideband from the chassis to pin 48 on the ecu (spliced and soldered in, my diagram showed that as the eccs ground) after this I started it up to see if it worked and it's still reading the same. I did come accross a thread after I re-grounded the wideband where someone else was having a similar issue and john mention that pin 39 is the main ground for the ecu. Should I again re-ground from pin 48 to pin 39? I just dont understand why there is such a big difference between what the gauge displays and what the afr gauge in nismotronic is displaying. Afr offset in nismotronic can only be adjusted +or- 2.5.

I'm getting power for my wideband directly from the battery via a relay. I also tested the wideband sensor to see if maybe it was faulty and it checked out ok.

Anyone have any idea's or input? Thanks, Dave.
2015-09-28 16:54:17
#2
1) I ended up grounding my Innovate with a direct line to the block/head. I wanted as clean a ground as possible, as in some cases, there is some signal interference from our old outdated harness wires. That was the best and cleanest ground and only adjusted the filter for the NEMu gauge frequency rate (how often the A/F value is averaged over time).

2) Did you select the AEM wideband option from the dropdown menu in the setup screen??
2015-09-28 16:56:37
#3
P.S I thought there was not a limit to the gauge offset adjustment?? If you have to adjust by several points, you may have another issue entirely (bad ground, bad settings in NEMU or just fried wideband controller).

Something also very evident; If the car was actually full lean, it would be very evident in sound and the fact that the vehicle would struggle to idle.
Last edited by Boostlee on 2015-09-28 at 16-58-14.
2015-09-28 18:13:43
#4
Originally Posted by Boostlee
1) I ended up grounding my Innovate with a direct line to the block/head. I wanted as clean a ground as possible, as in some cases, there is some signal interference from our old outdated harness wires. That was the best and cleanest ground and only adjusted the filter for the NEMu gauge frequency rate (how often the A/F value is averaged over time).

2) Did you select the AEM wideband option from the dropdown menu in the setup screen??


Originally Posted by Boostlee
P.S I thought there was not a limit to the gauge offset adjustment?? If you have to adjust by several points, you may have another issue entirely (bad ground, bad settings in NEMU or just fried wideband controller).

Something also very evident; If the car was actually full lean, it would be very evident in sound and the fact that the vehicle would struggle to idle.


Thanks for the input, I may just do the same and run the ground directly to the block/head or intake manifold. Yes I selected the aem uego digital in the drop down menu and enabled it crtl+u to upload/save. I didn't mess with the filter at all, In the start up calibration it's set at 4.

Yes, I talked to john and he told me there is a limit of +or- 2.5 for the afr offset.

The car does have a rough start up, I currently need to give the car some gas for it to actually start and hold it until the car warms up abit before it will idle on it's own. The car does kind of have a bit of a subaru note but does not seem to be missing.

Thanks, Dave.
2015-10-04 14:24:55
#5
Have you resolved you a/f issue yet?
2015-10-05 14:14:21
#6
Originally Posted by Haulin200sx
Have you resolved you a/f issue yet?


Not yet, I was pretty sick last week and never really got around to it. I did end up getting my digi cluster in so that resolved my speedo issue (was getting vehicle speed code) When I was wiring that up I cut the ground at the ecu and noticed I regrounded the wrong ground so gonna confirm wideband ground and actually re ground it, Lol. Hopefully tonight or tomorrow.
2015-10-07 13:36:45
#7
Finally resolved my issue! Re grounded wideband and re connected to the adc box making sure both connections were solid and no excess wire showing from the adc box! I also pulled my plugs and noticed one was looking lean, so I decided to check to see if maybe that injector was on its way out! All injectors read a perfect 14 ohms so next step was to check my connections. Using a noid light on the injector plug for the lean cylinder I was having an issue with the conversion harness for my current injectors, Pulled the harness off checked the oem injector plug with the noid, working perfect. So now I know there is an issue with the conversion harness for my plugs. Found the connection of the pins in the plug were extremely loose so I took them all apart and seated the pins into the plugs properly and reinstalled. Started the car afr was .2 off from what my ecu was reading, set the afr offset, idle is way better than it had been the past couple times I started her and now that my digi cluster is in and speedo is working the car is no longer in limp mode. Time to start getting some logs done!!
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