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  1. Join Date
    Jun 2013
    Posts
    439
    #11
    Quote Originally Posted by t2erns View Post
    research nyo evaporative emission system. marami rin may fuel tank pressure sensor.
    thanks sir, after i trace ko yung mga hose mula doon sa fuel neck at sa ilalim ng car, may nakita akong damaged na hose from tube sa ilalim ng car malapit sa gas neck papunta sa compartment sa likod tapos doon sa loob ng compartment naka attach yung hose sa may black plastik box na may valve, eto siguro yun evaporative emmission system, after ko palitan yun na damage na hose hindi ko na halos na papansin yun sound ng preassure coming sa gas tank pag binubuksan yung gas cap..

    problem naman e naging erratic yung idling nya, pag start mag stabilize sya ng mga 1000 rpm then after mga 5 secons bigla baba sa 500-700 pero hindi stable, taas baba sya at nag sha-shake yun engine :D

    thanks po sa mga nagbigay ng inputs..... :cheers:

  2. Join Date
    Feb 2009
    Posts
    5,130
    #12
    cars compliant to OBD II are designed to pressurize the system after shutdown and a pressure sensor monitors the pressure if it stays for a predetermined time from a slow calibrated leak. the objective is to check the the integrity of the hoses, tanks and the pressure cap if there are any leaks and to illuminate the malfunction indicator light if there are leaks. the vapors are stored in the charcoal canister to be used as fuel as the engine warms up and the throttle is above idle position. the pressure cap is a compound cap, there is a pressure cap that prevents release of fuel vapors into the atmosphere and a vacuum valve to allow atmospheric pressure into the tank when the fuel level drops. if there is pressure when you open the fuel cap hours after shutdown, the evaporative emission system might be saturated or clogged up. see your competent technician
    Last edited by jick.cejoco; September 9th, 2013 at 02:55 PM.

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Preassure sa Gas Cap