-15 to -35 Timing Advance WTF?! - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-16-2006, 12:39 AM   #11
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My numbers are reversed at WOT and idle though
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Old 10-16-2006, 07:18 PM   #12
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I believe the negative symbol in that has something to do with the scan tool showing spark in crank degrees @TDC. So, since TDC = 0*, -27 = 27* BTDC, or 27* spark advance. Maybe that'* the beer talking though...
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Old 10-16-2006, 07:42 PM   #13
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Just scanned my new GT for the first time.

I was seeing ~20 at idle and ~30 cruising, at WOT it was at ~24. So if your car is healthy than mine (prolly is) then your numbers look the be close.

What I had earlier are my GTP numbers .

-Jeremiah
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Old 10-16-2006, 09:38 PM   #14
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Thanks for the confirmation of the numbers - they just seemed WAY off, but now at least I know my car'* not too crazy. Aeroforce should take note of the negative numbers on '97 Bonnevilles in addition to the GP'*.
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Old 10-17-2006, 03:52 AM   #15
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Bob, I just looked over some of my old scan logs. My Auto Xray didn't do so well at logging data, but my timing numbers were very similar to yours. Seeing 18-20 degrees at WOT, and all the numbers were listed as negatives. When Intense tuned it they found no problems with the numbers they were seeing, and I forger if their HP Tuners software indicated positive or negative timing numbers. Whatever the case, rest assured that your car seems to be normal for a '97 L36 Bonnie.
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Old 10-17-2006, 01:34 PM   #16
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Hmmm... My 95 does 13*-14* at idle.... 19* WOT, And tooling around town say at 40 mph with TCC lock, I was seeing 38*-40*

My funky car is OBD1 tho... And is quirky at best

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Old 10-17-2006, 05:42 PM   #17
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97'* always list timing as negative, not sure why. N/A timing will always be higher than supercharged timing as well.
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Old 10-23-2006, 06:13 AM   #18
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Edit* Trying to clean up, the workings of someone trying to repay a debt
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