Help with high KR - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-27-2007, 11:51 AM   #11
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Pm sent.
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Old 06-27-2007, 01:57 PM   #12
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Boost-o-matic has spares for the greatest year ever made

It'* a toggle.. something that you need to experience to see.. I would say a good reading is probably flipping from one number to the next about twice a second. It is hard to describe.
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Old 06-28-2007, 03:09 PM   #13
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Quote:
Originally Posted by BillBoost37
It'* a toggle.. something that you need to experience to see.. I would say a good reading is probably flipping from one number to the next about twice a second. It is hard to describe.
So could you scan the car @ idle and watch the O2 for this flipping of the values?
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Old 06-28-2007, 03:17 PM   #14
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Exactly. It'* more of a 'feel' thing. You almost need to know how it acted new, so you can compare to what it acts like as it gets tired. It'* not really a defined diagnostic, but more of an indication. There is no toggle rate definition that could say good or bad, but it can give you an idea.
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Old 06-28-2007, 04:38 PM   #15
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Or if you scan more than one car.. and compare..

Toggling should be like the faster car
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Old 06-28-2007, 04:59 PM   #16
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Drifter,

I'll try and scan my car at idle tonight and I'll send you the logs.... I'm not sure if Bill has a scanner/tuner or not, but if so that would be three 97 SSEi'* logs to look at and compare.

But honestly I think if you just watch for a "flip/flop" between two values, that'* all you really need. Just as long as it isn't "locked" in at one value.
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Old 06-28-2007, 05:37 PM   #17
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Thanx for the offer guys.

Merlin. Will you be doing it with a car up to normal temp?? Or cold?? Or just up to temp from idling ( where the oil hasn't reached operating temp )

So when I compare I can reduce some of the variables. ( Or get them as close as possible )
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Old 06-28-2007, 05:43 PM   #18
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I always scan my car when it'* at operating temp, anything else will skew results.
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Old 06-29-2007, 01:54 PM   #19
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OK.. I don't know how to get a continous log on the 02 sensors yet.. but I ran the test on the 02 from the scan tool and this is what it says

rich to lean switch time are .04 Sec PASSED
Lean to rich switch time are .03 Sec PASSED

I"m unsure bout the graph. I will attempt more later on tonight when I can sit in the car and try again to find which settings it is to use for the 02 sensor with the scan tool.

I did notice however during the run onto the highway from work parking lot ( while car hasn't reached operating temp ) that there was no KR.. so now I"m wondering if Mustafa Drunken Monkey has nailed it with a tired 02 sensor attempting to lean the car thinkin it'* a rich setting when up to operating temp since during warm ups the car runs in a richer setting correct??



I guess I may have to break down and buy a new 02 sensor
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