Assitance needed: Tuning issue involving AEM UEGO Wideband
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Assitance needed: Tuning issue involving AEM UEGO Wideband
Hi all, I'm having something weird going on with my wideband(AEM UEGO). When the car warms up to operating temperature the gauge stays at 14.8-14.9 afr. The Hondata shows 15.xx, which I know is just an offset issue, but is also partially fixed and only fluctuates around .2-.3 degrees. Does anyone know why that is? This happens at idle when the car is at operating temperature and also at WOT. I find it hard to believe that the afr stays that consistent, going from idle to partial throttle to full throttle.
I just recently got the car running and the wideband sat with the car for a good amount of time. So I bought a new sensor thinking it might be a sensor issue. This new sensor was reacting the same way.
One thing to note is I am using D10 as my input source, ELD, and didn't cut resistor r136 in the ecu. Could this contribute to this problem?
Here is the tune and some data logs.
I just recently got the car running and the wideband sat with the car for a good amount of time. So I bought a new sensor thinking it might be a sensor issue. This new sensor was reacting the same way.
One thing to note is I am using D10 as my input source, ELD, and didn't cut resistor r136 in the ecu. Could this contribute to this problem?
Here is the tune and some data logs.
Last edited by blessed; Aug 19, 2020 at 08:12 PM.
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Re: Problem with tune
Can also give any relevant info to what else might be the problem.
I have randomly gotten a code 43 Fuel Supply System code before but don't understand why because I have brand new injectors, Golden Eagle fuel rail, FPR set at 45psi(and working), and a recently installed(new) Walbro 400 pump(from a 255 which also worked fine, just noisy).
I have randomly gotten a code 43 Fuel Supply System code before but don't understand why because I have brand new injectors, Golden Eagle fuel rail, FPR set at 45psi(and working), and a recently installed(new) Walbro 400 pump(from a 255 which also worked fine, just noisy).
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Re: Problem with tune
So my timing was way off. I sync'd it with the Hondata and I don't hit a wall at 5k anymore. My idle afr's are around 14.8-15.2 but they don't seem to move at all when in full throttle. Is that a problem with my sensor or some settings.
I have the wideband wired to D10 but I don't have r136 cut in the ecu(there's no r138). Would that possibly effect the signal even though I have ELD disabled?
Note: At cold start the afr's seem to work and are fluctuating(reading), but when operating temp is met they seem to freeze.
btw, I have o2 heater disabled so don't think it has anything to do with it.
I have the wideband wired to D10 but I don't have r136 cut in the ecu(there's no r138). Would that possibly effect the signal even though I have ELD disabled?
Note: At cold start the afr's seem to work and are fluctuating(reading), but when operating temp is met they seem to freeze.
btw, I have o2 heater disabled so don't think it has anything to do with it.
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From: san diego, ca
Re: Problem with tune
Hi all, I'm having a problem with a tune. Before my car sat for awhile the tune ran fine except for some idling issue, I believe it was some sensors/IACV. After getting the car running again and switching the injectors(Precision 1000cc to ID 1050x's), I'm having a lean problem I never had before and a problem with the car cutting out at 5k rpm, which also wasn't a problem before. I would get 12 AFR's during WOT, I don't remember what readings during idle.
Can anyone see if something in my tune changed during open loop operation? I don't understand how the car isn't running right since it ran before the car sat. I installed a bunch of new sensors and none of them helped. (ECT, ECT sender, IAT, IACV, TPS, MAP)I'm gonna upload the tune and some data logs.
Also, the car is randomly running super lean during idle and that also never happened before. It actually happened really recently. I thought the wideband sensor was bad so changed it but am still getting a lean reading. This is all weird to me because the old sensor, which I don't actually think is bad, had a lot of black stuff on it so think the car is running rich. I'm also getting black smoke and black splatters out of the exhaust.(could it be oil and not rich mixtured exhaust?)
Thanks for any help and I can make new data logs if needed.
Can anyone see if something in my tune changed during open loop operation? I don't understand how the car isn't running right since it ran before the car sat. I installed a bunch of new sensors and none of them helped. (ECT, ECT sender, IAT, IACV, TPS, MAP)I'm gonna upload the tune and some data logs.
Also, the car is randomly running super lean during idle and that also never happened before. It actually happened really recently. I thought the wideband sensor was bad so changed it but am still getting a lean reading. This is all weird to me because the old sensor, which I don't actually think is bad, had a lot of black stuff on it so think the car is running rich. I'm also getting black smoke and black splatters out of the exhaust.(could it be oil and not rich mixtured exhaust?)
Thanks for any help and I can make new data logs if needed.
So my timing was way off. I sync'd it with the Hondata and I don't hit a wall at 5k anymore. My idle afr's are around 14.8-15.2 but they don't seem to move at all when in full throttle. Is that a problem with my sensor or some settings.
I have the wideband wired to D10 but I don't have r136 cut in the ecu(there's no r138). Would that possibly effect the signal even though I have ELD disabled?
Note: At cold start the afr's seem to work and are fluctuating(reading), but when operating temp is met they seem to freeze.
btw, I have o2 heater disabled so don't think it has anything to do with it.
I have the wideband wired to D10 but I don't have r136 cut in the ecu(there's no r138). Would that possibly effect the signal even though I have ELD disabled?
Note: At cold start the afr's seem to work and are fluctuating(reading), but when operating temp is met they seem to freeze.
btw, I have o2 heater disabled so don't think it has anything to do with it.
You need to go into the parameters and make sure the injector size (Precicion 1,500cc) and dead times are correct for the size injectors you have and saved! if your tune is running off the 1,000cc injector settings you will never have a properly running engine and you can really screw something up!
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Re: Problem with tune
You need to go into the parameters and make sure the injector size (Precicion 1,500cc) and dead times are correct for the size injectors you have and saved! if your tune is running off the 1,000cc injector settings you will never have a properly running engine and you can really screw something up!
I just re-edited the original post. I had bad timing which is what caused a lot of my problems, like the super lean issue and 5k wall. I fixed it and am no longer running extremely lean at idle or WOT and no longer hitting a 5k rpm cut. However, I am now stuck with what seems to be a wideband reading issue. I can't really tell if the car is running alright or lean in WOT. To my knowledge 15afr is lean for WOT so that would be bad. Please read the post again as I've changed it.
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Thread Starter
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Re: Problem with tune
It seems to have helped but then the AEM started acting funny again after around 20-30 minutes. The car started showing rich readings but eventually leaned out again. I believe it's a wideband issue and not a tune issue at this point.
What should I do now? The only thing I can think of is a "brake cleaner rag test" and double checking the power/ground. Is there any other probelm possible with the wideband or ecu connection?
What should I do now? The only thing I can think of is a "brake cleaner rag test" and double checking the power/ground. Is there any other probelm possible with the wideband or ecu connection?
Thread Starter
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Re: Problem with tune
The car pulls nicely on this tune and it was reading 12's afr WOT before the car sat so I think the tune is just fine. It's the almost exact setup as before, almost the exact same parts, and it's literally the same exact motor the tune was done on. I sourced the original turbo/mani/dp and have similar size injectors and a slightly bigger wastegate. Theres no reason the tune should be at fault unless something changed during closed loop corrections from the wideband.
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