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Old 01-12-2013, 01:30 PM   #1
dartdude72
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2005 Legacy GT

Default EGT mod question

Just recently my car has been running rich and I can tell by the amount of smoke coming out of the exhaust form unburnt fuel. Around the same time, my EGT gauge stopped reading anything. I read around and found out about the 2.2k resistor mod that supposedly fools your computer into thinking that it is getting a signal. The confusing bit to me was that they also say its a thermocouple and I know that thermocouples work by outputing a small voltage which is then converted to a temperature. If that is the reason, why would a resistor imitate a voltage being there?
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Old 01-12-2013, 02:00 PM   #2
Coreycarlile911
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2006 Wrx sti
Black pearl

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Quote:
Originally Posted by dartdude72 View Post
Just recently my car has been running rich and I can tell by the amount of smoke coming out of the exhaust form unburnt fuel. Around the same time, my EGT gauge stopped reading anything. I read around and found out about the 2.2k resistor mod that supposedly fools your computer into thinking that it is getting a signal. The confusing bit to me was that they also say its a thermocouple and I know that thermocouples work by outputing a small voltage which is then converted to a temperature. If that is the reason, why would a resistor imitate a voltage being there?
Why not just get a tune?
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Old 01-12-2013, 02:08 PM   #3
dartdude72
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Originally Posted by Coreycarlile911 View Post
Why not just get a tune?
It has been tuned, just started running rich and thought it may be related to the EGT not showing up now. It could be just a broken wire to the gauge, more or less wondering why a resistor would be able to replace the EGT sensor when it is outputting a voltage.
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Old 01-12-2013, 02:39 PM   #4
Andrewxxcarlson
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Also interested in the answer to this!
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Old 02-08-2013, 01:02 AM   #5
Mike Wondo
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its to small to be a thermocouple...It doesnt produce millivolts...It senses Temperature and thats it..
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Old 02-08-2013, 10:21 AM   #6
Leafy
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its to small to be a thermocouple...It doesnt produce millivolts...It senses Temperature and thats it..
What? Thermocouples are tiny, its literally 2 wires of dissimilar metals bonded together. And the voltage differential between two dissimilar metals is related to their temperature. I find it hard to believe that there is a thermoresistor that is cheap to make that could function in the required temperature range.
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