Aem Uego Seems Off

[SargeRX8]

Hey all. I've got one of these fitted to my car. It's been fine. Just the other say I've noticed it's reading seems about lower. It's idling on about 11.0 when it used to idle at about 12 to 13. Cold start reads 10.0. It seems off. Is this normal? would you suspect the wideband or something actually affecting afr's? It's about 3 months old mounted in the stock o2 sensor location.

[JonnoHR31]

can you calibrate it? noticed any change in injector duties?

[SargeRX8]

These don't calibrate... Injector duties on cruising are about 3% idle is .8 which is where it's always at.

[JonnoHR31]

only way to be sure then is to check it against a known working wideband

[scotty nm35]

Dirty airflow sensor? I doubt its the wideband although I havent used the Uego. Can you get on a dyno for a run?

[SargeRX8]

Ill need to get it on a dyno. Just found my car idling with injector duty at 1.0% dropping to .9% then back up to 1.0%. Its odd because it always used to sit at .8% to .9%. Something is throwing out the tune. I have no idea how to clean the AFM so until I can rule out everything else, I'm going to leave the AFM alone for now. Tomorrow Ill pressurize the intake and listen for leaks. If I find none, ill erase the tune, self learn then reflash my tune. If no change, ill set the car on fire. If no change ill clean the AFM.

What would I clean the AFM with? I am thinking after driving back from work just now that it might be something else as the car was flopping a little when I clutched in to about 500rpm. Since I last tested the intake, there were no leaks. I am running a custom metal intake with stock BOV plumbed back and facing away from the AFM(pointing down the 90degree bend towards the turbo.

There was nothing I done which caused the sudden change. The last thing I did was actually heat wrap the dump but that was a while ago and the problem was only noticed a couple of days ago(I keep my eye on the afr's every now and then and it just seemed out of the ordinary).

Edited February 19, 2012 by SargeRX8

[Bsa]

Contact cleaner pull it off and give it a spray let it dry then re install easy

[Hanaldo]

I made a post about this in the Wideband thread in the FI section; I think I have the same or similar problem. My UEGO reads around 10-11 on idle and 12's/13's while cruising, sometimes lower. I'm 99% sure it's not the tune though, as the car drives exactly the same as always and there is no way I'd still be getting 550kms to a tank if my cruise AFR's were 12's. So I think it is either the sensor that has failed, OR there is a bad connection somewhere.

I haven't got around to pulling out the sensor or checking connections yet, so I'll let you know what I find when I do.

[SargeRX8]

I'll get it out tomorrow make sure everything is nice and tight. Pretty unfortunate if it is the sensor. Only a couple months old ffs. I wish I bought the innovate unit which can be calibrated when it reads off.

I'll try everything to see if slowly something makes a difference. It reads 10.0 on cold start, that is the lowest reading the unit can display. If that was the case I should be fouling plugs in the 9.x region...

[JonnoHR31]

I wish I bought the innovate unit

no you dont.... you'd be on your 3rd unit by now

[89CAL]

Where is the sensor installed and how have you been driving lately?

[SargeRX8]

After alot of reading about installation locations, I decided to fit it in the standard location where the thing normally goes. I don't think this should cause the unit to fail after 2000km of use... People have had theirs on their cars in that location for years Ive read with still consistent readings. Car doesn't get a hard time. I'm never constantly giving it stick. Maybe to overtake or just a little squirt here and there but nothing out of the ordinary. You can tell I drive like a bitch when after 1.5 years and about 30000km of driving, my kuhmo tires were on 70% lol and they came on the car.

Edited February 20, 2012 by SargeRX8

[89CAL]

Maybe you should go give it a thrash and see if that helps. There might be a carbon buildup on the sensor or something. Alternatively pull it out and have a look at it. See what reading you get when its in freash air

Mine has been fine since I put it in about 6 months ago. Reads exactly how the wideband did on my dyno run and the wideband used when it was first tuned.

But mine is in the suggested install location right about where the gearbox crossmember is

Where did you earth the gauge to? I dont think that will be the problem but check the earth is O.K anyway

[SargeRX8]

Fresh air I think it will fire all the way to lean, it does it when the ignition is on. Is there anything I can spray on it to clean it or is that not an option? Ill try take it for a little push later get some heat on it to try clear and burn off some of the carbon. Can't remember where I grounded it but Ill double check it.

Is there enough room for it to face the right way when you mount it under the car? Did you point it straight down or from the side.

[scotty nm35]

no you dont.... you'd be on your 3rd unit by now

What a load of crap, I have been running my innovative for over two years on the same sensor and it still reads perfectly, they obviously fixed any issues with them a long time ago. I even bought one cheap, ($50) from the for sale section and got it working again, then modified it with a USB input.

Its been a good unit, if a little too fast in reacting according to my tuner. He would prefer to have the output smoother while tuning but I can only set it up for 1/3 second refresh max in the software.

[89CAL]

Fresh air I think it will fire all the way to lean, it does it when the ignition is on. Is there anything I can spray on it to clean it or is that not an option? Ill try take it for a little push later get some heat on it to try clear and burn off some of the carbon. Can't remember where I grounded it but Ill double check it.

Is there enough room for it to face the right way when you mount it under the car? Did you point it straight down or from the side.

mine points slightly up and in (just about hits the gearbox crossmember) but its about where the instructions say to put it

Contact cleaner would probably be alright if you unplugged the sensor, cleaned it and let it sit for a few mins before putting it back in. Probably just better to take it for a thrash but, I dont think contact cleaner would worry it but just in case

[JonnoHR31]

What a load of crap, I have been running my innovative for over two years on the same sensor and it still reads perfectly, they obviously fixed any issues with them a long time ago. I even bought one cheap, ($50) from the for sale section and got it working again, then modified it with a USB input.

Its been a good unit, if a little too fast in reacting according to my tuner. He would prefer to have the output smoother while tuning but I can only set it up for 1/3 second refresh max in the software.

yer some of them are fine, but theres plenty of people (myself included) with several dead innovate units, through no fault of the end user a lot of them seam to have internal circuit failures, bad solder joints etc.

in open air it should rear around 20-21:1

[SargeRX8]

Can't read that high, this thing goes up to like 19 then it's ...

[Hanaldo]

Yeh the UEGO maxes at 18.5.

It will go to that in open air though. To test it, spray some brake cleaner on a cloth and cover cover the sensor with the cloth. It should go full rich to 10 and stay there. If it goes back to lean then it's stuffed.

Edited February 20, 2012 by Hanaldo

[scotty nm35]

One of the stagea blokes is having a similar issue with his AEM wideband also, lasted a few months.