Is your 1978, 1979, 1980 or 1981 Chevy or GMC Truck running rough? It could be a failed EFE valve. Eckler's Classic Chevy Trucks offers an original AC Delco replacement early fuel …

2009年4月13日 · The Vacuum Servo type uses a valve and vacuum actuator which increases the exhaust gas flow under the intake manifold during cold engine operation. The valve is located …

2015年2月15日 · When the TVS senses coolant at about 100º it cuts off the vacuum and vents the EFE valve to atmosphere, allowing it to open. The EFE works in conjunction with the …

2022年2月12日 · You've now confirmed (finally) that the EFE valve actuates. The next time your car is running, pull the vacuum hose out of the EFE valve and make sure it returns to "home" …

2014年9月28日 · It's called an EFE valve (Early Fuel Evaporation) and is a glorified heat riser. The valve closes to force hot exhaust gas through a broad passage integrated into the floor of …

2017年8月23日 · The PVS should be Normally OPEN, NOT NORMALLY CLOSED. When cold, the valve should be open, allowing vacuum to go to the EFE vacuum canister, closing the EFE …

2017年2月10日 · Watch the actuator arm when the engine is started. The valve should close when the engine is started cold; the actuator link will be pulled into the diaphragm housing. If …

2016年7月30日 · The EFE valve is basically a vacuum operated exhaust heat riser for rapid intake manifold heating and improved fuel atomization during cold weather operation. Study the …

The valve directs a portion of the exhaust gases through the intake manifold during engine warm-up. A thermal vacuum switch or a solenoid is used to control the EFE valve operation.

1985年4月3日 · Correct EFE Valve (Early Fuel Evaporation) Helps Fuel Vaporization During Cold Engine Operation; Directs Heat To The Base Of The Intake Manifold, Carburetor Or Central …