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Ms2 and aem wideband


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#1 Power ram 50 turbo

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Posted 11 July 2021 - 09:12 PM

I'm currently running an ms2 with a aem wideband and the wideband is connected to the ms2 I had to replace the wideband sensor and now under full boost my afr's are 13.4 and before it was 11.5 my question is will this affect the tune I'm not to sure it the ms is dependent on the o2 reading other than for data logs thanks sorry if this is a stupid question just not 100 %
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#2 scott87star

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Posted 12 July 2021 - 06:39 AM

The EGO control menu under fuel settings in Tuner Studio define where and how much the ECU uses the O2 reading to adjust fuel.
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#3 Power ram 50 turbo

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Posted 12 July 2021 - 06:53 AM

Ok so dose this mean I'm running lean?
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#4 scott87star

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Posted 12 July 2021 - 03:04 PM

Donít know, but if the ECU is allowed to control fuel at the point the O2 reads 13 and the AFR table says it should be 11.5 it will add fuel to get to 11.5.
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#5 Power ram 50 turbo

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Posted 12 July 2021 - 04:16 PM

Ok I'm going to try open air calibration thanks for the help i may have to have you look at the tune I looked at it today it looks like you are allowing the ecu to see the o2 but it's not adjusting it stays at 13.4 wot
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#6 psu_Crash

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Posted 13 July 2021 - 10:11 AM

View PostPower ram 50 turbo, on 12 July 2021 - 04:16 PM, said:

Ok I'm going to try open air calibration thanks for the help i may have to have you look at the tune I looked at it today it looks like you are allowing the ecu to see the o2 but it's not adjusting it stays at 13.4 wot

At WOT the O2 likely isn't doing anything. Usually you are in open loop operation there. Opposed to closed loop where it will control AFR to match your setpoint while cruising, under X% TPS and out of boost.
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#7 Power ram 50 turbo

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Posted 16 July 2021 - 04:45 PM

Ok thanks gentlemen it appears to be a bad 02 sensor the new one I put in looks to be defective I'm returning it I'll try a new one hopefully it will work
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#8 Power ram 50 turbo

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Posted 17 July 2021 - 08:28 AM

Update it turns out the new 02 I bought was a knockoff so I bought a  Genuine  Bosch 4.2 sensor all checked out well again thanks for the help
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#9 psu_Crash

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Posted 17 July 2021 - 04:04 PM

Glad to hear you got it figured out. I've heard others have issues with non genuine sensors. Always ran the Bosch and no issues.
'86 Starion, MPI with MS2extra, Turbo Lab GTX3071R, P&P head, OS SS Valves, Wiseco +.030, ARP head/rod, RPW Roller Cam, Crower Rods, AEM H2O/Meth Injection, Mighty Max CAS 4 Direct Fire Wasted Spark, BSE, Tial 38mm, JDL exhaust mani, HKS turbo timer and EVC3, AEM UEGO, 3" DP into 2 1/2" Dual Exhaust, 85# Delphi's, Magna modded by Chad, Accufab FPR, Walbro 255, D2 Coilovers, GNT Poly Bushings and mounts, Autopower 4 point cage, Funk-Lock, LED Tails and Dome ... etc^4
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