Sentences with phrase «evap vacuum»
The repair often involves replacing the EVAP vacuum switching valve (VSV) and the charcoal canister as an assembly, but if you want to save money, try replacing just the EVAP VSV and cleaning all the vacuum hoses at the canister; sometimes it may be enough to fix the problem.
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Often though, it's the EVAP vacuum switching valve (VSV) that goes bad.
Reports suggest that replacing only the EVAP vacuum switching valve (VSV) mounted at the canister can fix the problem in some cases.
Inspects vacuum hoses and fuel vapor lines and EVAP vacuum lines for breaks or bends (these lines can be very long so time should be taken when inspecting them; it may be necessary to use a smoke machine to find leaks successfully, especially small leaks that are difficult to see)
Not exact matches
The EPA started to require that leaking gasoline fumes be reduced to virtually zero, and the EVAP system on every current car is controlled largely by — you guessed it — engine vacuum.
Vacuum leaks are not discovered and repaired before replacing EVAP components.
Extensive amounts of time are used to detect vacuum leaks without testing for proper operation of the EVAP leak detection pump.
What can cause the code P0446: - faulty vent control valve - blockage at the vent hose, vent filter or vent control valve - open or short in the vent control valve circuit - bad charcoal canister - EVAP system leak - faulty EVAP system pressure sensor - bad vacuum switching valve (VSV)(Toyota, Lexus)- stuck open purge valve (solenoid) Examples: - A GM technical service bulletin for 1999 - 2007 Chevrolet Silverado and GMC Sierra describes a problem when if the vehicle is driven in dusty environment, the dust can enter into the canister vent hose and cause restricted air flow that can set the code P0446.
Once the EVAP system is sealed, the ECM monitors the vacuum or pressure in the EVAP system.
Without a scan - tool: The first part is to check visually for obvious problems: if the gas cap closed properly, there is no cracks or other damage on the charcoal canister and all vacuum hoses related to the EVAP system are properly connected.