SES light came on, lw300 - update

All is good now.
Cleaned the evap vent solenoid and reinstall.
Didn't have a scan tool so removed the battery cable for a minute to reset
everything. Had to re-enter all radio stations and clock but other than
that, no problems.
Been driving for several trips now and SES light is still off.
Oppie

 

What was coating the evap vent solenoid? I wonder if that injector
cleaner you put in could of had anything to do with it.

 

No, it was very fine dust that had accumulated and was jamming the solenoid
plunger.

In years past, the canisters with both solenoids were usually mounted in
the front fender. Unless you were driving behind another vehicle that was
kicking up dust, the vent pretty much got clean air. My L-series on the
other hand, puts the vent solenoid in the rear wheel well where it gets the
dust kicked up by front and rear wheels. Not too smart...especially since
the normal operation is to pull a small air flow from the vent through the
canister and into the tank. This pulls the vapors out of the canister and
burns them in the engine but it also allows a quantity of dust to enter the
fuel system.

Once I made an initial diagnosis, it took about a half hour to loosen the
fuel fill and rotate it to a point that I could get access to the vent
solenoid, remove, clean and reinstall the solenoid/filter.

Being the suspicious type, I couldn't help but wonder at the ses light
coming on at 50,235 miles. This is just over the mandatory emissions
warranty. Below 50K miles, the dealer has to pay for any emissions related
failures. With computers, you can do such creative things. No accusation,
just an interesting observation.

Oppie