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Dyno vs Scan Tool

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Old Dec 22, 2002 | 10:51 PM
  #1  
VetteMan's Avatar
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From: Mesienbach Germany
Dyno vs Scan Tool

We dyno my 86 vette today and discovered my Diacom GM PLus was showing a rich condition yet the dyno was showing a slight lean condition from idle to about 3000 rpms. The o2 sensor is a brand new bosh. Is there something I can adjust to get the ECM to reflect what the dyno is seeing?

Frank
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Old Dec 24, 2002 | 10:51 AM
  #2  
Grumpy's Avatar
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From: In reality
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
Re: Dyno vs Scan Tool

Originally posted by VetteMan
We dyno my 86 vette today and discovered my Diacom GM PLus was showing a rich condition yet the dyno was showing a slight lean condition from idle to about 3000 rpms. The o2 sensor is a brand new bosh. Is there something I can adjust to get the ECM to reflect what the dyno is seeing?

Frank
Nope, you've just witnessed why there are WB O2s, and then Switching O2s.

A switching O2 just tells you if your rich or lean, that's all it can reliably do.

If you want a O2 sensor to monitor AFR then you need a WB.
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