Having a voltage problem
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Having a voltage problem
Took some info on my Autoxray and noticed my fuel pump voltage is 13.3 and my battery voltage is 13.4. Usually the voltage is : battery=14.3 fuel pump=14.2
What would cause the voltage drop? Could it be the battery? The voltmeter is reading slightly lower and it looked like FP dropped a little on my gauge as well. I can also hear that the pitch of the fuel pump has changed
And while viewing "real time" mode on my Autoxray, I noticed Closed loop/ Open loop mode switches back and forth. Again, it never did this before either.
The oxygen sensor is new and is performing correctly. Any help or suggestions would be appreciated.
Thanks
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91 Formula 1LE 1 of 46
305 TPI 5speed
1LE/G92/WS6
Paxton SN92 supercharger, Ford SVO 24#injectors, Crane AFPR,SLP airfoil, ported/polished plenum, March alt. pulley,Crane Gold 1.6rrs,MSD coil,MSD6AL (5400rpm limit),Holley 9mm wires,Ac delco R43ts plugs,custom chip,Bosch O2sensor,SLP 1 5/8" headers,SLP catback,shortened shifter,3:73s w/Auburn posi,180* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.
What would cause the voltage drop? Could it be the battery? The voltmeter is reading slightly lower and it looked like FP dropped a little on my gauge as well. I can also hear that the pitch of the fuel pump has changed
And while viewing "real time" mode on my Autoxray, I noticed Closed loop/ Open loop mode switches back and forth. Again, it never did this before either.
The oxygen sensor is new and is performing correctly. Any help or suggestions would be appreciated.
Thanks
------------------
91 Formula 1LE 1 of 46
305 TPI 5speed
1LE/G92/WS6
Paxton SN92 supercharger, Ford SVO 24#injectors, Crane AFPR,SLP airfoil, ported/polished plenum, March alt. pulley,Crane Gold 1.6rrs,MSD coil,MSD6AL (5400rpm limit),Holley 9mm wires,Ac delco R43ts plugs,custom chip,Bosch O2sensor,SLP 1 5/8" headers,SLP catback,shortened shifter,3:73s w/Auburn posi,180* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.
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Joined: Jul 1999
Posts: 1,335
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From: Tucson, AZ, USA
Car: '92 Z28; Dk Teal; Her Pkg
Engine: 305
Transmission: Richmond 6 Spd
Axle/Gears: Moser 9", Detroit Locker, 3.70
Alternator voltage output typically decreases with increasing temperature, so when it's cold, it's voltage output may be higher than when it's hot.
Tim
Tim
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Joined: Oct 2000
Posts: 405
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From: Gulf Coast
Car: 1988 Trans Am GTA
Engine: 5.0 TPI
Transmission: TH700-R4
Axle/Gears: 3.27
Voltage is never the same over a lenght of conductor. A voltage drop is expected since the wire is not resistance free. Under normal conditions a voltage drop of about 1 volt per 100ft is normal depending on conductor (wire) size, temperature, type of load, and other conditions.
Now as we all know the voltage on the electrical system is never steady because the load on the alternator is always changing even when the regulator is supposed to maintain. I would not be concerned with a .1 volt decrease, or even a slightly bigger change, like Tim said temperature does have an effect on it.
Now as we all know the voltage on the electrical system is never steady because the load on the alternator is always changing even when the regulator is supposed to maintain. I would not be concerned with a .1 volt decrease, or even a slightly bigger change, like Tim said temperature does have an effect on it.
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