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O2 sensor going crazy, no codes?

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Old Aug 14, 2013 | 03:14 PM
  #1  
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Car: 1989 IROC & ROLL-Z
Engine: L98 Vortec FIRST TPI
Transmission: T56, Mech Speedo
Axle/Gears: G92 J65 3.27
O2 sensor going crazy, no codes?

Not sure if this is the right spot to post this.
Dont have experience enough to know if this is normal. Can anyone take a look real quick?

First pic is at the start of a 10 minute drive.
Attached Thumbnails O2 sensor going crazy, no codes?-o2-sensor-initial.png   O2 sensor going crazy, no codes?-o2-sensor-final.png  

Last edited by Keoman; Aug 14, 2013 at 03:17 PM.
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Old Aug 14, 2013 | 03:28 PM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: O2 sensor going crazy, no codes?

The only thing I see is its taking along time to become active like the o2 is not heated and in headers. What do you mean bye your o2 is going crazy the swing ?
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Old Aug 14, 2013 | 04:08 PM
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Keoman's Avatar
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From: Salt Lake
Car: 1989 IROC & ROLL-Z
Engine: L98 Vortec FIRST TPI
Transmission: T56, Mech Speedo
Axle/Gears: G92 J65 3.27
Re: O2 sensor going crazy, no codes?

Yeah the whole 150mv to 700mv thing in half a second. I thought it was supposed to remain somewhat constant? Also trying to diagnose what is making my car shutter under load at low RPM's.

EDIT
Just drove to work and got a code 32. Hoping that is it.

Last edited by Keoman; Aug 14, 2013 at 04:33 PM.
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Old Aug 14, 2013 | 07:56 PM
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: O2 sensor going crazy, no codes?

The o2 swing looks good, watch your blm and int. IIRC when the egr malf 32 hits The ecm goes into lhm. most of the time the code 32 will throw for a faulty egr temp sensor. You can still have egr function if the malf is disabled.
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Old Aug 15, 2013 | 12:48 AM
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From: Salt Lake
Car: 1989 IROC & ROLL-Z
Engine: L98 Vortec FIRST TPI
Transmission: T56, Mech Speedo
Axle/Gears: G92 J65 3.27
Re: O2 sensor going crazy, no codes?

Sorry there's a lot of shorthand in your message I'm not familiar with.
My vaccum switch connector for the EGR is really bad and I think it may have come undone all together. I ordered a new 2 pi weather pack connector and will get it fixed as soon as it gets here.

I really really want to get this stutter figured out. Only happens under 1500 RPM's. If my O2 is fine then what else could it be causing this!?
I have completly checked every piece of my ignition system and it all checked out fine. Only other thought would be a vacuum leak? But wouldn't that mess wih my idle more?
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Old Aug 15, 2013 | 08:55 AM
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Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: O2 sensor going crazy, no codes?

Sending you a pm
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