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Old 01-29-2003, 01:50 PM   #1
BrysImpreza
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Question A/F Gauge Electrical Interference?

My A/F gauge is kind of messed up and I can't figure out why.

after the car is nice and warmed up, it reads a bit on the rich side... thats fine... It's a Subaru

Then I turn on my lights... it reads Stoich, then I turn on the heat and the rear defroster... it's Stoich to Lean

Godforbid I turn on my fogs, then I'm totally lean!

What is causing this? Do I have an electrical bleed somewhere?

Should I shorten the power line?

Ideas?

Thanx!
Bry.
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Old 01-29-2003, 02:13 PM   #2
cRayZee
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are you doing this during idle or this happens even while you're driving?
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Old 01-29-2003, 03:40 PM   #3
BrysImpreza
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idle, when I'm driving, doesn't matter

Bry.
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Old 01-29-2003, 03:54 PM   #4
cRayZee
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But when you're driving, it reads the same as if all those things weren't on?
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Old 01-29-2003, 03:56 PM   #5
BrysImpreza
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Quote:
Originally posted by cRayZee
But when you're driving, it reads the same as if all those things weren't on?
Correct, if I sit at idle its pretty much the same as driving with no electrical devices on.
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Old 01-29-2003, 04:01 PM   #6
CyC
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Does it ever read A/F mixture as how you would expect? I mean... does it change at all when you hit the gas or let off or anything?
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Old 01-29-2003, 04:05 PM   #7
BrysImpreza
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Quote:
Originally posted by CyC
Does it ever read A/F mixture as how you would expect? I mean... does it change at all when you hit the gas or let off or anything?
I think so, but it's not as sparatic like most other A/F readings I've seen, it's fairly constant

Bry.
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Old 01-29-2003, 04:15 PM   #8
cRayZee
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have you checked your battery voltage when you've turned on all those devices during idle? Would it be possible that the load affect the O2 sensor readings? Maybe the input voltage on the O2 sensor was reduced under heavy electrical load and outputs a lower voltage signal to the A/F gauge?
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