Join Date: Apr 2004
Feedback Score: 0 reviews
Re: Exhaust Back Pressure Valve
The exhaust back pressure valve is triggered by oil temperature. If the oil temp is below about fifty degrees the valve will close during light throttle. You can split one of the wires and splice in a switch, which will allow you to manually overide and allow the valve to open. It will set a code but no check engine light. I did this on my early 99, I would run it about two miles on a twelve mile morning commute and then switch the valve open. It recovered the two MPG I lost during cold weather driving.
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