EVAP idle and no codes info and question

[jasonvibe]

My experience for 10+ YEARS WITH THIS CAR. 1st ....the 1st gens need to replace the poor quality hoses under the hood on the EVAP system. They rot out , crack where they are connected and leak..in 3-5 years. ANd you will not get a CEL. Get Gates 5/16" hose and EFI clamps. This solved my 1st bad idle issue after I wasted time changing the intake gasket. Oh joy, now I have orange updated intake gasket as the old black ones do fail. Now when the evap solenoid by driver fender kicks on...click, click like it should. The quality of the idle goes down. I get no codes. Had smoke test done on EVAP and solenoid seals properly. I do get a code 133 once a year like clock work every spring. The O2 sensor replacement did not solve the 133 as the manual says it should. Gas mileage has not changed since the day we bought it new. 22-23 city 30+ hiway for an AWD is good and what the EPA rated it at. Just idles poorly...when evap sol. kicks in. All hoses at intake have much better clamps than OEM. Actually smaller versions of what you see on the radiator hoses. Known as spring clamps. I also check the throttle body used on AWDs for any looseness in the rotation, nothing. The only bad thing that may have something to do with this. For the first few years I would sometimes top off the tank. Meaning pump would click ...stop. But I would add another 1/2 gallon no problem to round it to the next dollar. Could this have damaged the EVAP can charcoal but not give me EVAP codes? ANd now many years later issues. Any ideas...any experiences like this bad idle, no codes but associated to the evap ?

[Chiadog]

Thanks for the info. on the possibility of EVAP hose deterioration!
On the Charcoal Canister, I may have ruined one (sudden trouble filling gas tank) by overfilling the gas tank and letting the car(2000 Saturn) sit for several months over the Winter! Upon pulling it out of storage - instant non-filling gas tank. No codes were ever sent, and I just lived with it until I sold the car. I had been overfilling the tank on this Saturn on nearly every fill-up for years before this without ever having a gas tank filling problem. I always filled in town and then drove 25-30 miles to get home. Possibly clearing out the flooded canister before turning the car off?
My takeaway: Don't over fill the gas tank and then let the car sit.

[jasonvibe]

it was just a bad habit of mine especially in the winter. Vibe has small tank. But I really checked into the EVAP and fuel tank design. The is a breather vent that is supposed to prevent any fuel from getting into the EVAP on a Vibe. That's one of the reasons I an lost on this. Could it be slow deterioration of the charcoal from my early bad habits. And now with bad charcoal the EVAP acts like an intake leak because it'sjust a hollow box. I may disconnect the evap hose at the manifold and cap it, and see how the car drives. If no one else has ideas...

[Chiadog]

And now with bad charcoal the EVAP acts like an intake leak because it'sjust a hollow box. I may disconnect the evap hose at the manifold and cap it, and see how the car drives. If no one else has ideas...

I am not too sure the car would run any differently if the C. canister WAS an empty box! I'm assuming the solenoid valves, etc. would still limit flow rate into the intake.