I am having to fix a Mazda 626 1998 EVAP gross gas leak, can you help me?
ProTech:
I sure can try…what seems to be the trouble?
Smog failed test, a EVAP system gas leak.
Things that usually cause a large EVAP leak are a loose or bad gas cap, a stuck open vent valve, a bad purge solenoid, or a break or crack somewhere in the EVAP system and lines.
P0455 EVAP control system gross leak detected is what i was told.
Yes that’s the code it would set.
How would i fix this?
Well without some special equipment, you will basically have to guess at parts until you get it right. You really need a nitrogen or smoke machine that attaches to the EVAP system to find the leak. Check that the gas cap is sealing and tightening good. This is a common problem for code P0455 EVAP leak.
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1 Comment on "1998 Mazda 626 Failed Smog Test With Code P0455"
Check the cap first then the filler tube (if not rusty it is probably OK) Where the problem probably is is on the back side of the gas tank on the passenger side. There is a solenoid valve there which allows the gas tank to vent when the engine is off. That valve closes and seals the system when the engine is running. What happens is eventually moisture gets in there and fouls up the seals in the valve. This is especially true if you have a lot of rust under the car.