Afr lean at idle and good at wot?????
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Junior Member
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Joined: Sep 2010
Posts: 95
Likes: 7
From: Toronto
Car: 89 Firebird Formula
Engine: 383 tpi vortec heads Xr 269 cam
Transmission: 700R4
Axle/Gears: 3.73
Afr lean at idle and good at wot?????
i hooked up an innovate wideband 02 sensor and getting very lean 22 during idle at 1500 rpm in driveway
During wot driving 3-5000 rpm afr 10-11
at stop light at 1500 rpm 15-16
when i calibrate the innovate it shows 22.4 in open air. I don't think it is possible to have 22 afr during idle in drive way????
any thoughts
During wot driving 3-5000 rpm afr 10-11
at stop light at 1500 rpm 15-16
when i calibrate the innovate it shows 22.4 in open air. I don't think it is possible to have 22 afr during idle in drive way????
any thoughts
Thread Starter
Junior Member
iTrader: (1)
Joined: Sep 2010
Posts: 95
Likes: 7
From: Toronto
Car: 89 Firebird Formula
Engine: 383 tpi vortec heads Xr 269 cam
Transmission: 700R4
Axle/Gears: 3.73
Re: Afr lean at idle and good at wot?????
Driving at 1500-2000 rpm afr is 14.5-15
engine is 383 with 30# injectors and chip from member at thirdgen
engine is 383 with 30# injectors and chip from member at thirdgen
Last edited by toronto formula; Apr 22, 2017 at 04:27 PM. Reason: Addition
Joined: Jun 2000
Posts: 5,364
Likes: 51
From: Enschede, Netherlands
Car: 82 TA 87 IZ L98 88 IZ LB9 88 IZ L98
Engine: 5.7TBI 5,7TPI 5.0TPI, 5,7TPI
Transmission: T5, 700R4, T5, 700R4
Axle/Gears: 3.08, 3.27, 3.45, 3.27
Re: Afr lean at idle and good at wot?????
1500 idle is too high anyway and 10 to 11 wot too fat
Joined: Dec 2004
Posts: 16,754
Likes: 996
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Afr lean at idle and good at wot?????
If those readings are right you need to datalog for your tuner to correct the maf tables.
Thread Starter
Junior Member
iTrader: (1)
Joined: Sep 2010
Posts: 95
Likes: 7
From: Toronto
Car: 89 Firebird Formula
Engine: 383 tpi vortec heads Xr 269 cam
Transmission: 700R4
Axle/Gears: 3.73
Re: Afr lean at idle and good at wot?????
tuning is a problem for me at this point in time wrt to new program or chip. I know I can get a better tune
i can play with my fuel and timing for now
vanilla ice
o2 bung is welded in my cat bypass pipe the weld looks solid
is the lean lean only presenting itself at idle because of my cam overlap 114 for a X-r 269(by memory)?
i want to drive the car but worried about this lean at idle causing damage.....
i can play with my fuel and timing for now
vanilla ice
o2 bung is welded in my cat bypass pipe the weld looks solid
is the lean lean only presenting itself at idle because of my cam overlap 114 for a X-r 269(by memory)?
i want to drive the car but worried about this lean at idle causing damage.....