EGT mod question

dartdude72 · 01-12-2013, 01:30 PM

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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Coreycarlile911 · 01-12-2013, 02:00 PM

Quote:

Originally Posted by dartdude72

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?

dartdude72 · 01-12-2013, 02:08 PM

Quote:

Originally Posted by Coreycarlile911

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.

Andrewxxcarlson · 01-12-2013, 02:39 PM

Also interested in the answer to this!

Mike Wondo · 02-08-2013, 01:02 AM

its to small to be a thermocouple...It doesnt produce millivolts...It senses Temperature and thats it..

Leafy · 02-08-2013, 10:21 AM

Quote:

Originally Posted by Mike Wondo

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.

01-12-2013, 01:30 PM	#1
dartdude72 Scooby Newbie Member#: 310505 Join Date: Feb 2012 Chapter/Region: MWSOC Location: IA Vehicle: 2005 Legacy GT	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? * Registered users of the site do not see these ads.

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01-12-2013, 02:39 PM	#4
Andrewxxcarlson Scooby Specialist Member#: 316415 Join Date: Apr 2012 Location: Elk Grove, CA Vehicle: 2006 WRX WRB	Also interested in the answer to this!

02-08-2013, 01:02 AM	#5
Mike Wondo Scooby Newbie Member#: 332416 Join Date: Sep 2012 Chapter/Region: SCIC Location: Mountain Center,CA. Vehicle: 2002 WRX Bugeye Silver	its to small to be a thermocouple...It doesnt produce millivolts...It senses Temperature and thats it..