Question about EGR
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Intermediate
Joined: Jun 2003
Posts: 35
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From: glencoe AL
Question about EGR
I was wondering if anyone could {actually take the time to} explain what the EGR does? When does it come into play? Start or highway? Just wanting some clarity. Thanks in advance!!
Racer
Joined: Nov 2004
Posts: 363
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From: Iowa Go Hawks
the EGR valve routes a small amount of th exhaust gas ( 5-15% of the in take air) into the intake manifold and back into the combustion chambers in order to reduce the formation of nitrogen oxides. It also is supposed to reduce in cylinder temps. engine must be in the proper range for the ecm to open the EGR, ECT neither too hot or too cool. tps at part throttle (not WOT or idle).
Drifting
Joined: Jul 2002
Posts: 1,273
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From: Olathe, KS USA
Originally Posted by mesteffen
the EGR valve routes a small amount of th exhaust gas ( 5-15% of the in take air) into the intake manifold and back into the combustion chambers in order to reduce the formation of nitrogen oxides. It also is supposed to reduce in cylinder temps. engine must be in the proper range for the ecm to open the EGR, ECT neither too hot or too cool. tps at part throttle (not WOT or idle).
Melting Slicks
Joined: Jul 2003
Posts: 2,384
Likes: 124
From: Reno/Sparks Nevada
Ported vacuum is used in conjunction with the EGR solenoid to apply the vacuum to the EGR valve. This solenoid is located on the RH side of the engine just above the valve cover on the early TPIs. The computer switches this solenoid on and off to pass or block vacuum to the EGR valve which is located under the plenum between the intake runners. There is an electical connection on the back side of the solenoid, and a couple of hard plastic lines that come off of it. One of them goes to the EGR valve, the other to ported vacuum. I found, on a friends car, the plastic nipples on the solenoid valve broken. The EGR wouldn't apply, and his car wouldn't pass smog. I was able to super glue it back on. His car then passed smog.
Last edited by MrRenoman; Dec 6, 2004 at 10:25 PM.
