failed Smog - Help!

[luli]

My '94 ranger failed smog because of "Fuel Evaporative Contrls Functional" What do I need to do to fix this?

 

[n2epv]

I've never worked on a Ranger, but had a number of Escorts (89 - 96) and had the same failure. The evap system is the charcoal canister and related rubber hoses. There are several hoses between the charcoal canister and the intake manifold + one going back to the gas tank. The idea is that when the engine isn't running, evaporated gas is pushed out of the top of the tank and is stored in the charcoal canister. When you start the engine, the canister is 'purged' of the stored gas fumes by the intake manifold vacuum.

On one of the lines between the canister and the intake, there is a black cylinder which is a flow sensor to verify that there is indeed a flow of fumes and air (from the canister into the intake) when the PCM thinks there should be. If the flow signal isn't proper, you get this fault code.

The first thing to check is that all the rubber lines are good. I believe that there are electrical connections to both the flow sensor and a solenoid as well. If either connector is corroded, that will cause the same code.

I'm not sure of the locations of any of these items on a Ranger, so someone who knows those trucks can help.

 

[Tbars4]

...Let us know if you have any codes that have shown up...

...This thread may help with your problem...
http://www.explorerforum.com/forums/showthread.php?t=219411