LN3 miss...pulse - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-21-2006, 10:58 PM   #11
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it feels like a complete shutdown for a half second, then back to normal. only when coasting in gear
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Old 04-22-2006, 01:05 AM   #12
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monitored the o2 readings. directly after the pulse the o2 voltage drops to 0.00 or very close to it
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Old 04-22-2006, 10:36 AM   #13
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Quote:
Originally Posted by maybe2fast
monitored the o2 readings. directly after the pulse the o2 voltage drops to 0.00 or very close to it
Ok. The only thing that will cause the O2'* to drop to 0.00 volts would be a loss of fuel (IE: injectors shut off). This can happen in Decel Fuel Cutoff mode; but can also happen if you have a crank position sensor going bad. Where you on the gas (throttle) at all during this period or was this occuring durning a decel?

-ryan
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Old 04-22-2006, 07:14 PM   #14
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absoulutly only occurs when my foot is off the gas. never under pressure
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Old 04-24-2006, 01:07 AM   #15
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going to swap PROMs and see if it changes
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