evap canister question
Thread Starter
Member
Joined: Feb 2001
Posts: 422
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From: Rockford,IL, Unitied States
Car: 1991 Pontiac Firebird
Engine: 305
Transmission: 700R
evap canister question
How do you know when the vap
canister is full, and needs to be
changeed,m emptied.. or whatever you
do.. actually what do you do?
can the car run ****ty if this thing gets full?
canister is full, and needs to be
changeed,m emptied.. or whatever you
do.. actually what do you do?
can the car run ****ty if this thing gets full?
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Joined: Sep 2000
Posts: 6,775
Likes: 27
From: So.west IN
Car: 87 Formula/ 00 Xtreme
Engine: TPI 305/ v6
Transmission: struggling t-5/ 4l60E
Axle/Gears: 3.08/ 3.23
This should answer your question I hope...
"The Evaporative Emission Control System is designed to prevent gasoline vapors in the fuel system from entering the atmosphere. It utilizes a sealed fuel tank, a liquid-vapor separator, and vent lines to a vapor-storing canister filled with activated charcoal and connected to the carburetor (throttle body on fuel injected engines). The filler cap is normally not vented to the atmosphere, but is fitted with a valve to allow both pressure and vacuum relief.
Vapor lines lead to the canister from the fuel tank and from the canister to the engine intake manifold. When the vehicle is parked, vapor from the fuel tank collects in the canister. When the engine reaches the proper speed, the stored vapors are drawn into the engine intake manifold and consumed during combustion.
On most vehicles, canister purge is regulated by an ECM-controlled solenoid that allows engine vacuum to purge the canister. To prevent purge at idle or when the engine is cold, vacuum is closed off from the canister. The solenoid may be either energized or de-energized by the ECM, depending on whether the solenoid is normally open or closed. EVAP canister purge is controlled by pulse width modulation of the solenoid.
EVAP canister purge occurs when the following conditions have been met:
Engine running for a specified time
Coolant temperature above specified value
Vehicle speed above a specified mph (some applications)
Throttle off-idle
If the solenoid valve sticks or fails to open, the canister can purge to the intake manifold at all times. This can allow extra fuel to enter the inlet manifold at idle or during engine warm-up, which can cause a rough or unstable idle due to overly rich operation. "
------------------
"Always do sober what you said you'd do drunk. That will teach
you to keep your mouth shut."
"The Evaporative Emission Control System is designed to prevent gasoline vapors in the fuel system from entering the atmosphere. It utilizes a sealed fuel tank, a liquid-vapor separator, and vent lines to a vapor-storing canister filled with activated charcoal and connected to the carburetor (throttle body on fuel injected engines). The filler cap is normally not vented to the atmosphere, but is fitted with a valve to allow both pressure and vacuum relief.
Vapor lines lead to the canister from the fuel tank and from the canister to the engine intake manifold. When the vehicle is parked, vapor from the fuel tank collects in the canister. When the engine reaches the proper speed, the stored vapors are drawn into the engine intake manifold and consumed during combustion.
On most vehicles, canister purge is regulated by an ECM-controlled solenoid that allows engine vacuum to purge the canister. To prevent purge at idle or when the engine is cold, vacuum is closed off from the canister. The solenoid may be either energized or de-energized by the ECM, depending on whether the solenoid is normally open or closed. EVAP canister purge is controlled by pulse width modulation of the solenoid.
EVAP canister purge occurs when the following conditions have been met:
Engine running for a specified time
Coolant temperature above specified value
Vehicle speed above a specified mph (some applications)
Throttle off-idle
If the solenoid valve sticks or fails to open, the canister can purge to the intake manifold at all times. This can allow extra fuel to enter the inlet manifold at idle or during engine warm-up, which can cause a rough or unstable idle due to overly rich operation. "
------------------
"Always do sober what you said you'd do drunk. That will teach
you to keep your mouth shut."
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