Question about 1984 Chevrolet Monte Carlo
How can you tell if the vacuum lines to the emission control is not working properly?
Sometimes the engine will rev high and other times the computer will look for the idle and will go up and down in the rpms
Posted on Sep 11, 2008
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Posted on Jan 02, 2017
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This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
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