Evap system and EGR
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From: Greenwood, Indiana
Car: 1984 Trans Am
Engine: Vortec 355
Transmission: TH-700R4
Axle/Gears: GM Axles and GM 3.73
Evap system and EGR
hey i wanna learn more about these systems does anyone know any good website that would give details about each component and how it can effect the running of the motor when it is out of whack....any help would b great
thanks!
thanks!
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Joined: Jul 2003
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From: Grand Rapids, MI
Car: Z28
Engine: Sb2.2 406
Transmission: Jerico 4 speed
Axle/Gears: Ford 9" 3.60
ask away! I'm sure someone here knows. 
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Joined: Jan 2002
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From: Bloomingdale,IL
Car: 91 RS
Engine: 305 Tbi (L03)
Transmission: 700r4
Egr-Exhaust gas recirculation
This system is designed to reduce your Nox emmisions. Nox is caused by high cylinder temps which gennerally occur under cruise conditions. It does this by adding exhaust gas to the intake. The exhaust is inert(will not burn). That lowers the cylinder temps and thus the nox emmisions. On our cars the valve is operated by engine vacuum on a diaphram. The vacuum is controlled by a solenoid that is computer controlled.
An egr that is operating at idle will cause the engine to stumble and possibly die. You can hear that one for yourself by pressing on the egr diaphram while your car is idleing. A failing egr has little effect on wot operation due to the lack of vacuum.
Evap
The evap is designed to put the fuel vapors into the engine instead of the atmosphere. A line is run from the tank to the charcoal canister for storage. When the ecm feels the time is right it will purge the vapors by way of a solenoid. These vapors enter intake and are burned by the engine. If the system isnt operating properly it can cause the engine to run slightly lean or rich, or it may release vapors to the atmosphere.
This system is designed to reduce your Nox emmisions. Nox is caused by high cylinder temps which gennerally occur under cruise conditions. It does this by adding exhaust gas to the intake. The exhaust is inert(will not burn). That lowers the cylinder temps and thus the nox emmisions. On our cars the valve is operated by engine vacuum on a diaphram. The vacuum is controlled by a solenoid that is computer controlled.
An egr that is operating at idle will cause the engine to stumble and possibly die. You can hear that one for yourself by pressing on the egr diaphram while your car is idleing. A failing egr has little effect on wot operation due to the lack of vacuum.
Evap
The evap is designed to put the fuel vapors into the engine instead of the atmosphere. A line is run from the tank to the charcoal canister for storage. When the ecm feels the time is right it will purge the vapors by way of a solenoid. These vapors enter intake and are burned by the engine. If the system isnt operating properly it can cause the engine to run slightly lean or rich, or it may release vapors to the atmosphere.
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