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well for narrow band u test with propane.
you induce your system with propane and you see if it goes full rich and then let it drop to the bottom wen you turn off the propane and you snap throttle to see if it has a quick reaction to the full lean to full rich. it would help if you have a fluke 97 or dso cant remember been awhile sence ive tested a narrow. i know in teh smog update class for 2005 they teach you how to test wide band
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