Quote:
Originally Posted by racprops
My 2000 GM does that as well. 29/30 hiway all day long.
Sadly all that I have tried to make it do more has failed, hydro, fuel vapor, messing with the PCM..tuneing it for 27: 1 air/fuel all failed to make a dent..29/30 every time..
Rich
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I'm surprised you weren't getting detonation at 27:1 ratio. Do you have a Scan Gauge? If so was it running in open or closed loop at 27:1?