My Kams and Lambse all show to be good. I just upgraded from cast iron ported GT40 heads with a ported cobra intake to Vic Jr heads, ported RPM II intake, and 1.7's RR's. My cam is 228/238 duration. Car runs great! In closed loop at idle my LC1 is datalogging 15.5-16.5 AFR. My Kams are left bank 1.05 and Rt bank .99 pretty consistantly. My Lambse is showing right about 14.4-14.6 so maybe just a tad lean. When I'm driving the WB ready about stoich, 14.3-14.9, very consistantly and the KAMS arte right in the .95-1.05 range everywhere. It just seems off at idle. I've heard of strange O2 readings at idle with longtubes or a big cam, but all I did was change heads and intake with slightly more lift using 1.7's on the exhaust valve. Could the increase in lift be causing the issue?

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1995 Cobra, 331, 2.02/1.60 fully ported GT40 heads, Extrude Honed Cobra U/L, 30# injectors, Isky Cam 228/238-524/544-112º LSA w/9º overlap, headers, O/R exhaust, 65mm t/b, 73mm C&L.

1993 Lightning, 351, AKCO MAF Conversion, Vortech S-Trim, Intercooled, 60# Injectors, HPX Slot Meter, AFR Heads, HO Mustang Roller Cam, 1.6 RR's, Longtube Headers, GT40 intake, Accufab 70mm race tb, 4.56 gears, QH, BE, Innovate LC1

thats not lean thats perfect

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http://www.efidynotuning.com/ford/

Yes acording to the KAMs, and the Lambse it's perfect, but my wideband is showing in the 16's at idle. That is not matching what I should be seening in closed look which is 14.7ish. I'm thinking it could be a small exhaust leak possibly?

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1995 Cobra, 331, 2.02/1.60 fully ported GT40 heads, Extrude Honed Cobra U/L, 30# injectors, Isky Cam 228/238-524/544-112º LSA w/9º overlap, headers, O/R exhaust, 65mm t/b, 73mm C&L.

1993 Lightning, 351, AKCO MAF Conversion, Vortech S-Trim, Intercooled, 60# Injectors, HPX Slot Meter, AFR Heads, HO Mustang Roller Cam, 1.6 RR's, Longtube Headers, GT40 intake, Accufab 70mm race tb, 4.56 gears, QH, BE, Innovate LC1

Agreed. My afr @ idle is around 1.10 lambda.Perfectly fine.

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1989 GT - 25th Anniversary 5.0, Vortech S-Trim, TFS Trackheat Heads & Intake, TFS Stage 1 Cam, FRPP 1.6 RR, 75mm TB, Pro-M 80mm, Anderson Power Pipe, FRPP 42#s, GS-340/255 lph pump, Anderson 1-3/4 shorties, 3" Borla Exhaust, Tremec T-5, 3.73-31 spline, MSD 6AL2, complete-lowered suspension A9L, Moates QH/SL v1.6/1.4, BE, EA, Innovate LC-1/XD-16.

1992 LX - 25.1c Chassis, Vortech Blown Renegade 317, Lentech Trans, TRZ Backhalf,A3M1, Moates QH/SL v1.6/1.4 BE, EA

But if it's in closed loop then wouldn't I see something closer to stoich like I did before the swap and like I do now under part throttle driving? It's only reading off at idle.

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1995 Cobra, 331, 2.02/1.60 fully ported GT40 heads, Extrude Honed Cobra U/L, 30# injectors, Isky Cam 228/238-524/544-112º LSA w/9º overlap, headers, O/R exhaust, 65mm t/b, 73mm C&L.

1993 Lightning, 351, AKCO MAF Conversion, Vortech S-Trim, Intercooled, 60# Injectors, HPX Slot Meter, AFR Heads, HO Mustang Roller Cam, 1.6 RR's, Longtube Headers, GT40 intake, Accufab 70mm race tb, 4.56 gears, QH, BE, Innovate LC1

No, your cam is creating some exhaust reversion due to the overlap built into it thus showing lean on the wideband but in reality is actually stoich or a lil rich.

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1989 GT - 25th Anniversary 5.0, Vortech S-Trim, TFS Trackheat Heads & Intake, TFS Stage 1 Cam, FRPP 1.6 RR, 75mm TB, Pro-M 80mm, Anderson Power Pipe, FRPP 42#s, GS-340/255 lph pump, Anderson 1-3/4 shorties, 3" Borla Exhaust, Tremec T-5, 3.73-31 spline, MSD 6AL2, complete-lowered suspension A9L, Moates QH/SL v1.6/1.4, BE, EA, Innovate LC-1/XD-16.

1992 LX - 25.1c Chassis, Vortech Blown Renegade 317, Lentech Trans, TRZ Backhalf,A3M1, Moates QH/SL v1.6/1.4 BE, EA

I think you are correct. I haven't installed a larger cam but I did go from 1.94 intake vales to 2.05's and 1.50 to 1.60 exhaust valves. I also increased the lift by .300. I triple checked and can find zero exhaust leaks, I recalibrated the sensor, and my hegos on both banks wander from 14.3 then creep to 14.9 then back to 14.2, repeat, repeat, repeat. My Kams show .97 to 1.02 so that looks like my Hegos info is accurate. Sucks because it just looks wrong when I look at the gauge.. IT actually gets the highest vacume reading when I richen the mix, and command 14.2 in open loop, but the wideband still shows 16.+.

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1995 Cobra, 331, 2.02/1.60 fully ported GT40 heads, Extrude Honed Cobra U/L, 30# injectors, Isky Cam 228/238-524/544-112º LSA w/9º overlap, headers, O/R exhaust, 65mm t/b, 73mm C&L.

1993 Lightning, 351, AKCO MAF Conversion, Vortech S-Trim, Intercooled, 60# Injectors, HPX Slot Meter, AFR Heads, HO Mustang Roller Cam, 1.6 RR's, Longtube Headers, GT40 intake, Accufab 70mm race tb, 4.56 gears, QH, BE, Innovate LC1

This I believe is normal.

I've seen it before on engines equipped with long tube headers. It also does it on my 5.0 with BBK Ceramic coated Long tubes. On a bone cold start up my Innovate MTX-L will show(after Bosch O2 Htr hits operating temp) 16.5 to 17:1 lean at idle warm up. Once the headers get some heat in them the Wideband starts to mirror the LAMBSE targets reported in TunerPro RT(yes, I use TunerPro rather than BE).

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Certified; ASE Parts Pro(P2), Oracle Database Engineer
1990 Mustang LX Sport 'Vert, 5.0L, GT-40 Intake, SVO X303 Heads, Trick Flow Stage1 Cam, 24lb Inj, 70mm SVO MAF, 70mm Holley TB, BBK Ceramic L/T's & O/R H-pipe, T-5 'Z' Code, 31-Spline Trac-Loc(Carbon clutch packs), Moser 31-Spline Axles
GUFB - X3Z, Innovate MTX-L, Moates QH v1.6, TunerPro RT v5(Because I refuse to pay for tuning software that costs twice as much as my PC's OS)