Wideband shows LEAN on two step. Normal? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 15 Old 08-31-2012, 08:07 PM Thread Starter
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Wideband shows LEAN on two step. Normal?

Just got my two step working today and noticed the my AFR is buried on the lean side when on the two step limiter. Is that normal, or should I be concerned? I also noticed that I occasionally get a backfire when using it.


1989 5.0 T5 LX Hatch - Explorer Short Block with an FMS F-303 cam, TFS TW170 heads, Tmoss Ported Cobra Intake, an On3 Turbo Kit with a 67mm Ceramic Ball Bearing Turbo, and backed by a T56 Magnum 6spd with 3.55's
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post #2 of 15 Old 08-31-2012, 08:41 PM
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Mine goes lean too and it backfires through the exhaust and that's super loud. I think that's normal. Haven't launched the car with the two step yet cause I haven't had time to get to the track in like 2 months. But when it starts backfiring it starts makin boost with a quickness!


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post #3 of 15 Old 09-01-2012, 12:12 AM
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It's normal, they sound like a machine gun going off.

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post #4 of 15 Old 09-01-2012, 01:56 AM
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All normal. You are throwing a bunch of air and fuel down the pipe.
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post #5 of 15 Old 09-01-2012, 09:09 PM
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if the car is loading up thus making boost and your a/f is showing lean then thats never good. it is however a good way to melt a piston

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post #6 of 15 Old 09-02-2012, 01:01 PM
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Quote:
Originally Posted by LS1KILR View Post
if the car is loading up thus making boost and your a/f is showing lean then thats never good. it is however a good way to melt a piston
What??? The car is showing a false lean because he is sending unburnt fuel into the exhaust. It is perfectly normal.
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post #7 of 15 Old 09-02-2012, 01:17 PM
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what kind of 2 step? MSD or sct xcal 2 step? guessing a msd type 2 step. does it cut fuel or air?

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post #8 of 15 Old 09-02-2012, 01:50 PM
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spark

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post #9 of 15 Old 09-02-2012, 03:37 PM
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What??? The car is showing a false lean because he is sending unburnt fuel into the exhaust. It is perfectly normal.
Actually it is unburnt oxygen. Oxygen sensors measure oxygen, not fuel.

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post #10 of 15 Old 09-02-2012, 11:09 PM Thread Starter
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My two step is with an MSD 6 Programmable box. So it is normal?


1989 5.0 T5 LX Hatch - Explorer Short Block with an FMS F-303 cam, TFS TW170 heads, Tmoss Ported Cobra Intake, an On3 Turbo Kit with a 67mm Ceramic Ball Bearing Turbo, and backed by a T56 Magnum 6spd with 3.55's
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post #11 of 15 Old 09-02-2012, 11:18 PM
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Anytime you cut the spark you will get a false lean reading. 100% normal.

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Old combo:352 single 76mm turbo, 16psi, AOD, 9.41 @ 149mph, E85, 255/50/16 MT DR, 3500lb STREET car driven everywhere.
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post #12 of 15 Old 09-03-2012, 12:50 AM
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Quote:
Originally Posted by LS1KILR View Post
if the car is loading up thus making boost and your a/f is showing lean then thats never good. it is however a good way to melt a piston


Not even close to correct.


As mentioned already, you're getting a false lean reading due to the two step cutting spark and lots of unburned fuel going out the exhaust.

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post #13 of 15 Old 09-10-2012, 04:24 PM
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Originally Posted by stangjumper View Post
Actually it is unburnt oxygen. Oxygen sensors measure oxygen, not fuel.
When I was referring to fuel I meant unburnt combustion, which is both fuel and oxygen. Guess I should have been more specific.
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post #14 of 15 Old 09-10-2012, 06:03 PM Thread Starter
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When I was referring to fuel I meant unburnt combustion, which is both fuel and oxygen. Guess I should have been more specific.
Wouldn't unburnt combustion basically be raw fuel. To which the wideband would read as uber rich?

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post #15 of 15 Old 09-11-2012, 11:32 AM
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Originally Posted by MYSTICSVT View Post
Wouldn't unburnt combustion basically be raw fuel. To which the wideband would read as uber rich?
Widebands don't even know what raw fuel is, it's the oxygen they read. If it's raw fuel... it's raw air, so it reads lean.

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