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I've searched and searched here and found that the ECU bump can be used to change the fuel mixture. Some posts say it is only good for idle range only though. I'm looking for someone that knows if this is true or can tell me if a bump is a global thing that will affect the entire RPM range. By adding say a BAK, that will defiantly make you run leaner because there is no O2 sensor to tell the ECU you had added a lot more air. I know a PCIII is the best way to go, but in the short term, I need to know if the bump is Idle Only or Entire Range.



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Bob
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The built in map on your ECU is an across the board set up. That is not to say its a flat line. There are spots built into it where it goes a little rich or a little lean as it passes through the RPM range. So the ECU bump passes the increase or decrease to that built in map.
 
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