how does the evap work?

Asked by spottsss Jan 18, 2021 at 12:29 PM about the 2004 Chevrolet Cavalier Coupe FWD

Question type: Maintenance & Repair

Evaporation reclaimer

1 Answer

154,885

The EVAP emission control system basically sends gasoline fumes to the engine to be burned up instead of being released into the atmosphere. There's a few vacuum hoses, solenoids, and a charcoal canister involved. The computer regulates the flow and frequency of these fumes from the gas tank to the engine by opening and closing the purge valve. When the system has a leak the computer will turn on the check engine light or service engine soon light and a trouble code will be set. If a small leak is detected a smoke machine may be needed to find the leak. Smoke is injected in the system. Then the mechanic looks at the EVAP system lines carefully to see where the smoke is coming out. When they find the smoke, they've found the leak. Hope that helps! Jim

Your Answer:

CarGurus Experts

  • #1
    John Saffrahn
    Reputation
    4,830
  • #2
    dandyoun
    Reputation
    1,980
  • #3
    mbar1
    Reputation
    1,670
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Cobalt
22 listings starting at $3,500
Used Chevrolet Silverado 1500
213 Great Deals out of 9,034 listings starting at $2,900
Used Chevrolet Malibu
48 Great Deals out of 1,130 listings starting at $2,995
Used Chevrolet Aveo
3 Great Deals out of 17 listings starting at $3,677
Used Chevrolet Suburban
13 Great Deals out of 509 listings starting at $11,950
Used Ford Mustang
54 Great Deals out of 1,606 listings starting at $6,200
Used Ford F-150
343 Great Deals out of 12,723 listings starting at $599
Used Honda Civic
186 Great Deals out of 4,226 listings starting at $2,499

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.