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Re: Effects of weak battery on performance
Proper voltage is very important, no different then if the house A/C was low and how a TV or other electronics would function under lower voltages.
One example is the fuel injectors.
They get voltage directly from battery.
The PCM to assure some limp mode function and to makeup for voltage differences monitors the voltage and adjust the injectors ON time to try and keep the fuel flow constant.
As voltage gets lower the injectors would flow less so the PCM increases or reduces injectors ON times as voltage level changes.
This effects performance and the PCM itself ( as all other controllers in the car) really will not function well under 12 volts
Keep in mind voltage drops, it could be 12.1 volts at the battery but voltage drop by the time it gets to PCM which could be getting 11.7 volts.
The more electronics added to cars yet still using 40 year old 12 volt designs forced GM to up to 14.5 volts but the wiring is too small a gage to handle the current loads of parts like relays, fuel pumps, HUD, Onstar, etc.
SAE wanted to go to 48 volt system standard but Japan has been holding this up for 6 years as they wanted their patents of 42 volts designs to then charge all vendors for that design.
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Mike M - 2001 / 2008 Z06s
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