O2 sensor modifications?
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O2 sensor modifications?
Scrollin around the web one day I stumbled across a diagram for a tweak mod for the o2 sensor. It showed a cap and a resitor from one of the lines being tied to ground wire. When going back to find it I couldnt remember where it was. Did anyone else hear of this mod and what the purpose? It could maybe that it reports lower voltage back to the pcm in return the pcm creates a richer mixture.
Logistics Pro
Joined: Jan 2002
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From: suburban atlanta
O2 sensor modifications?
I think what you saw was the resistor added to the coolant temp sensor circuit in series, fooling the ECM into thinking that the engine was cooler, thus calling for a richer mixture...& more power & less mpg...
tom
tom
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O2 sensor modifications?
No it was the o2 sensor. When I find it I will post it. It was similar to what you said in that it was saying back by a lower voltage that there was more o2 in the stream therefore the pcm kept a rich mixture.
Theres all kinds of tricks its mind boggling! Recently I put my MAT sensor in the fresh air duct before the throttle body giving the engine the cool air power all the time. This one really works even after driving for an hour.
Theres all kinds of tricks its mind boggling! Recently I put my MAT sensor in the fresh air duct before the throttle body giving the engine the cool air power all the time. This one really works even after driving for an hour.
Logistics Pro
Joined: Jan 2002
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From: suburban atlanta
O2 sensor modifications?
Well, an O2 sensor just switches back and forth from .1volt to .9 volts depending on the excess? Oxygen in the exhaust. Low volts is 'lean' as there is an excess of oxygen in the exhaust. Hi volts is rich.. there is no extra O2 in the exhaust. I have no idea how you can improve on the 'perfect' mixture of oxygen to fuel.. especially with a 'fudge' factor resistor...
tom
tom
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From: Houston/Hope BC
O2 sensor modifications?
Been a while since I read the spec sheet but your O2 sensor ouputs a voltage as Tom says from .1 to .9 and it is a pretty radical curve (volts vs. mixture). It kinda looks like IMCLONE stock, kinda flat, trending down slowly, then it takes a very fast dive (somewhere around 14.7:1 and 7.1 Volts, but don't quote me.) then it flattens out again. Your resistor modification should just shift this curve a tad the right direction for you, which I guess is more power (richer) and more pollution (beware of CAT damage). If I recall right, an O2 doesn't "come on" until it hits 600 EGT, there are (more expensive) heated ones that read at lower EGT.... GL
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jaykaran
1987 - 1996 F150 & Larger F-Series Trucks
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Feb 19, 2011 01:57 PM
