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07-11-2002, 02:11 PM | #1 |
Registered Member
Join Date: May 2001
Location: Oklahoma City OK USA
Posts: 236
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Some qestions about the EGR system and how it works.
Ok, The egr system is designed to mix ehxaust gas from the motor into the air coming into the motor.
Is this done to cut down on emissions? I would think that exhaust gas coming into the motor would reduce the HP produced by the motor. What triggers the valve to open and let exhaust gas into the incoming air(when is it open)? Is the valve open at WOT? Thanks
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90 GT 25th Anni. Did the AOD to T-5 swap, SPEC clutch, Steeda Tri-Ax shifter, BBK 2½ inch off-road H pipe, Flows, BBK 70mm TB/EGR, Ford Racing aluminim driveshaft, 3.55's, welded subframes, Ram Air, 3 core radiator, NOS dry kit 75 shot, and a K&N filter. 12.9 @ 108 |
07-11-2002, 02:52 PM | #2 | |
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Join Date: Mar 1999
Location: Ventura, California
Posts: 8,981
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The EGR system takes a small amount of inert gas from the exhaust and allows it to re-enter the intake manifold to be burned again. This is largely for emissions, but it also acts to cool the temp of the combustion chamber. It is not used at idle, or during WOT, or when the engine is cold. It is primarily used during cruising speeds, after the engine is at or above it's normal operating temp. The ECM calculates this being added to the mixture, and relies on it for maximum performance. I just sent an email to a close friend telling him about a recent example of what can happen with an EGR fault:
Quote:
Take care, -Chris
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