First drive with the scantool - Knock issues or not? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-01-2007, 11:42 PM   #1
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Default First drive with the scantool - Knock issues or not?

I did some searching but as threads get outdated I want some new feedback.

On the first hard acceleration from about 40-80, I saw 2-3 degrees of KR but ONLY when I hit around 80mph. from 40-78ish KR was at 0. Not too bad I thought. The car seemed to run great.

I then did a custom data read and set the tool to read KR and the KS counter (along with IAC position and Spark Advance).

On the first hard acceleration, KR read 0 the whole time I floored it up to 80+. Felt nice. The KS counter however showed 10.

Second acceleration, KR read 0, spark advance was 12*, but KS counter jumped to 17.

Third...fourth...I got a mere 1 degree of KR once I hit 91mph. As far as KR goes, that'* all I saw. 12* spark advance. When I was done joyriding, the KS counter read 44!

WTF is going on? The counter is supposed to show how many times knock is sensed, but why did I have no KR? Should I pay more attention to KR than the KS counter? Afterall, if no timing was retarded, knock must not be bad.
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Old 05-02-2007, 12:31 AM   #2
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KR degrees are calculated and determined by the number of knock counts detected in a period of time.

So that part is normal.

Your symptoms point to a possible fuel pump issue not being able to keep up with high demand. At WOT near 80mph, you would be at high rpm'* at the top of second gear, just before the 3rd shift. This is where you will begin to see a lean condition as your fuel pump begins to end it'* career.
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Old 05-02-2007, 12:48 AM   #3
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So I didn't have enough knock counts in a given period of time for it to retard timing? The number 44 for knock counts has me worried, yet the KR doesn't.

Last time I checked fuel pressure was maybe 7-8 months ago...last summer. Fuel pressure was actually great at idle and WOT, higher than what is 'normal' (to which you suggested a possible obstruction in a return line, or the FPR being faulty IIRC). Maybe I should check again. At 135,000 I suppose a new fuel pump would be a good idea.
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Old 05-02-2007, 02:33 AM   #4
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FWIW, the AutoXray manual says the range for knock count is 0 to 255...so maybe 40'* isn't so bad?
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Old 05-02-2007, 10:21 AM   #5
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From my research too, the counter goes up to 255 and then resets to 0. I still don't understand how much it has to count before I should be worried, and it starts to show KR. If it got to 44 just last night on a 30-minute drive, I can imagine how many times it would have counted to 255 if I had a scantool on it the past year.
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Old 05-02-2007, 02:51 PM   #6
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Most people don't monitor counts. It'* actual KR that you want to keep an eye on.
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Old 05-02-2007, 02:59 PM   #7
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That'* all I want to know.
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Old 05-02-2007, 09:09 PM   #8
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Yeah Pete you want to worry about the KR...

If you turn the ignition on and watch.... Hit the starter and watch the counts...lol

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