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It may be that the additive cleaned enough goop from the EGR temp sensor that it could better reflect the temp increase when the EGR opened. That is the reason for its existence, when the EGR valve is commanded to open the only way for the computer (in this system) to know whether or not it actually did open is to detect exhaust gas temp flowing past the sensor.
The coolant sensor may have been bad anyway. The only correlation between the two is when the engine is cold the EGR will not be commanded to open.
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Last edited by Beav; 03-12-2005 at 04:50 PM.
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