How would a bad battery affect performance ?
Postmaster
Joined: Jun 2008
Posts: 2,564
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From: Wayyy NoCal, USA
It's unlikely, but possible for an intermittent shorts or opens inside the battery to cause pretty significant voltage fluctuations in the system. The ECU is a computer. Computers don't much like variable voltage. Also, since most sensors are variable resistors, fluctuating input voltages result in fluctuating output voltages - which is what the ECU is "reading" and using to select timing and fuel maps. Think GIGO....
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New User
Joined: Mar 2010
Posts: 18
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Just replaced the battery yesterday and started thinking about most everything on these trucks running off of some sort of electricity if it would affect the afore mentioned power, performance .
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Former Vendor
Joined: Sep 2000
Posts: 2,627
Likes: 76
From: South Carolina
my 2 cents
A maf sensor uses voltage to measure air flow (fuel/spark).. when a batteries voltage drops for what ever reason ( weak battery or alt.) say at wide open throttle... the vehicle can drift to a lean condition...
A maf sensor uses voltage to measure air flow (fuel/spark).. when a batteries voltage drops for what ever reason ( weak battery or alt.) say at wide open throttle... the vehicle can drift to a lean condition...
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New User
Joined: Mar 2010
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So that could be the reason for my drop in fuel mileage ? Maybe we'll see filled up this morning I'll see what I get on this tank?.
FTE Leadership Emeritus
Joined: Jul 2002
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From: Long Island USA
Hmm...
Posting Guru
Joined: Mar 2005
Posts: 2,060
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From: Burnsville, MN
That would depend on how the reference voltage is establish.... Certain devices (like zener diodes) trigger relative to particular set voltages, not as a percentage of the available voltage. Not a clue though as to what is actualy going on inside the PCM....
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