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Old 12-30-2012, 03:24 PM   #1
veel86
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Member#: 308550
Join Date: Jan 2012
Chapter/Region: MWSOC
Location: South West Michigan
Vehicle:
2006 Wrx STi
Aspen White

Default Cylinder ruffness

I want to understand what exactly this means. In one of my cylinders I saw a reading at 1. Then it went to zero. This happened when I was just idling. Can anyone tell me what that means?
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Old 12-31-2012, 10:38 AM   #2
fritzski
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Chapter/Region: RMIC
Location: colorado
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10 sti
wrb

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i am under the impression that the cylinder ruffness counts misfires, i may be wrong and maybe one of the cobb gurus could shed some light on this if i am
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Old 12-31-2012, 12:20 PM   #3
veel86
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2006 Wrx STi
Aspen White

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Oh okay I just replaced my spark plugs and I haven't seen any more cylinder ruffness sense that one occasion.
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Old 01-02-2013, 09:52 AM   #4
Cobb Tuning
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Yes, the roughness monitor is a misfire count (per cylinder). The ECU determines misfires by basically looking for unusual variations in RPM. There are certain variable thresholds that determine the level of misfire counts before a check engine light code is set so it is possible to have perceived misfires without a DTC if the level is low enough.

Bill
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Old 01-02-2013, 01:02 PM   #5
veel86
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Join Date: Jan 2012
Chapter/Region: MWSOC
Location: South West Michigan
Vehicle:
2006 Wrx STi
Aspen White

Default

Oh okay thank you very much.
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