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04-23-2016, 02:52 PM
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#1 | |
 
Drives: 2014 2SS/RS 1LE, Supercharged Join Date: Jan 2014
Location: Germany
Posts: 16
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AEM AFR erratic behaviour
Got my AEM AFR 30-4110 installed. Checked the Bosch 4.9 sensor with brake cleaner as advised from AEM support - all fine. Full rich (10) with brake cleaner for a minute - by removing it goes lean (17).
On idle it shows this: Itīs very erratic @ idle. Between 13.5-16+. Only on WOT itīs in a steady range 10.5-10.9. While cruising it moves in any direction - 12-16. Doesīt make any sense to me. Engine is warmed up properly. Connected power+ and ground- to the cigarette lighter lines. Finally need this for a final tune with SCT X4, but Iīm afraid that the logging is ruined by a wrong setup. Any thoughts from your side? |
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04-23-2016, 03:02 PM
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#2 |
  Drives: camaro ss\rs Join Date: Jun 2014
Location: Italia
Posts: 755
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Did you switch on the car without giving power to the sensor? Switch on the car may damage the sensor if not connected to the power supply.
BTW I've never heard about cleaning an o2 sensor with brake cleaner
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2014 camaro SS Whipple powered ,3.750 pulley,ID850, CAI,Flowmaster American Thunder exhaust,MGW racing shifter,Bo White ported tb,MightyMouse Catch Can,Vitesse throttle controller,GM 3.91 rear end, Dynatech longtube haders, BTR Pd cam,Fluidampr stock pulley,ZL1 fuel pump and ADM fpcm, Phastek scoop and fluid thank relocation Bmr Motor mount . Tuned by Mastuning
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04-23-2016, 03:30 PM
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#3 |
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Drives: 2014 2SS/RS 1LE, Supercharged Join Date: Jan 2014
Location: Germany
Posts: 16
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Power is on the cigarette lighter lines as you turn the key. So - I donīt run the sensor without power :big grin:...
The brake cleaner procedure was done, because I contacted the AEM support on this issue. The sensor is new and I didnīt try to clean it - I tried to find out, if the sensor is working 
Last edited by nidecker; 04-23-2016 at 03:45 PM. |
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04-23-2016, 03:34 PM
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#4 |
    
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It's going to bounce around at idle. WOT it will go steady.
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04-23-2016, 03:46 PM
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#5 |
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Drives: 2014 2SS/RS 1LE, Supercharged Join Date: Jan 2014
Location: Germany
Posts: 16
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Valuable answer - the only thing I worry about is the bouncing while cruising...I thought it would be more steady...
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04-23-2016, 03:52 PM
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#6 | |
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Quote:
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04-23-2016, 03:56 PM
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#7 | |
Drives: 2013 Camaro SS Turbo Join Date: Apr 2014
Location: South Florida
Posts: 1,525
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Quote:
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04-23-2016, 04:02 PM
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#8 |
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Drives: 2014 2SS/RS 1LE, Supercharged Join Date: Jan 2014
Location: Germany
Posts: 16
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So if itīs common to bounce around - whatīs the meaning of an AFR gauge...is only for the purpose of getting the info if the engine is running too lean on WOT?
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04-23-2016, 04:25 PM
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#9 | |
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Drives: 2013 Camaro SS Turbo Join Date: Apr 2014
Location: South Florida
Posts: 1,525
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Quote:
and also can monitor drive-ability but wot tune is most important,
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04-24-2016, 05:00 AM
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#10 |
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Drives: it changes Join Date: Nov 2010
Location: Norn Iron
Posts: 1,126
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It looks like it's very slow, but OEM vehicles that run stich at low loads...ie 14.7:1, strictly speaking do not sit static at this.
They'll be switching very fast either side of this always monitored and corrected by the factory narrowband sensors. Although that does seem a fairly wide swing on yours. How does it read at low speed, steady speed cruise etc ? Where is the sensor isntalled ? |
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04-24-2016, 08:07 AM
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#11 |
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10.11 @ 136.32
Drives: Black & Yellow 2SS/RS LPE LS7 427 Join Date: Mar 2010
Location: Redcliff, Alberta
Posts: 957
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That looks very normal to me. Open loop and wandering at idle and closed loop and steady at WOT. Go ahead and log the vehicle. Your tuner will tell you if something is wrong with the AFR output on your log.
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04-24-2016, 12:23 PM
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#12 |
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Too much is never enough!
Drives: AGP TT SS [COTW] 4/20/15 Join Date: Feb 2014
Location: Toledo,OH
Posts: 4,149
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Like others have said, that is completely normal for idling, and looks like its functioning correctly, just like it should. Think of it as a wave like on an oscilloscope, the computer is always trying to get the afr at what's its commanded at, in open loop. So it goes rich to lean, then rich to lean, then over and over the cycle repeats. Then once you go WOT you go closed loop, then the AFR should be steady, it may change from what its commanded at in your tune by a few points, but all in all, you will notice that it stays pretty steady.
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AGP TT kit, 54/57 Forged rotating assembly, Custom grind cam... Dual nozzle meth, ID850's, Livernois dual fuel pumps, ECS BAP, 25% UDP, 3 inch Magnaflow catback with X pipe, Mantic 9000 clutch, DSS 1000hp axles, DSS aluminum driveshaft, ZL1 rear end, solid subframe bushings, HE differential offset bushings, BMR Trailing arm, BMR toe rods, Lingenfelter LNC-2000,SJM Line Lock. 747 whp 714wtq
Build thread http://www.camaro5.com/forums/showth...55#post8107855 |
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04-24-2016, 12:28 PM
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#13 |
 
Drives: 2014 Camaro SS Rs Join Date: Aug 2014
Location: Amarillo
Posts: 110
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Mine does the same thing man. I just watch it at WOT. Thats whats important to me.
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04-25-2016, 02:48 PM
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#14 |
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Drives: 2014 2SS/RS 1LE, Supercharged Join Date: Jan 2014
Location: Germany
Posts: 16
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Before I posted this question I search the forum + the internet for days for an precise answer, because before opening up a new thread, everybody should use the search function :big grin:
But I couldnīt find anything regarding a correct behaviour of this AFR gauge...now everything is much clearer to me and gives me a good feeling using the AFR gauge. Thanks guys - this was more than helpful  !regards from Germany! |
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