I have done searches, couldnt quite find what I need...

I had been getting code p1441, so I checked for vacuum at idle in Part 7 in this diagram, found that there was, so I replaced the part. Problem seemed to be solved.

Couple days later, another code. This time p0441. I know this is EVAP System No Flow During Purge. Did a search, and found that maybe my lines are clogged/leaking/etc. Pulled the rear wheel and checked all the EVAP lines in the fenderwell going to and from the Charcoal Canister. I blew into them, and there doesnt seem to be any clogs. All the lines look fine, as well as the canister itself.

My question is, when I pulled off the EVAP Pressure Control Valve (seen here lower right corner), it looked ok, but I was able to blow into the tube to canister (4, in lower right diagram) AND the tube to tank (7, in lower right diagram). Granted, neither was easy to blow thru, but I could do it.

Should I be able to blow both ways into this valve? How do I tell if this valve needs to be replaced? Assuming it is bad, could this valve be causing my trouble code p0441 ?

Sorry for the long explanation...

Thanks guys, I appreciate your help.

 

If you find a fix, please post it or pm me with the solution.

 

No flow during purge can either be a plugged or sticking (closed) purge solenoid (part #7), or a plug somewhere in the lines between the canister and the flow detector (part #11).

With the engine running, verify that you have vacuum where the line from the TB connects to the purge solenoid. Then apply +12V to the solenoid and verify that it opens, and that the vacuum is now present on the purge solenoid connection for the line from the canister. Note that the solenoid is permanently connected to +12V on the brown wire, so what you really need to do to operate the solenoid it connect the green/white wire to a ground.

On the canister end, when the purge solenoid at the engine opens, it will pull air in through connection #2 on the canister, and out connection #3. Either of those could be plugged up. But I don't see how the pressure control valve would be involved.

 

thanks for the help...i'll give it a try...

 

How different is this from the 3.8L engine on a 96 Firebird? Because I'm coming up with the same problem. Any help is appreciated. Thanks!

 

Sorry to dig up an old post.. but i am having this exact same problem... i am getting a P0441 Code, pretty much everytime i Accelerate fast, I.E. Going on to the highway, about 30 seconds after i get on the on ramp and am cruising in 6th the "SES" light Coems on and gives that code... its ONLY during hard acceleration because i clear it everytime and only comes on during thesew cicumstances... whcih is why i think its clogged...

 

What does the EVAP system do anyway?

 

You're getting the code when you do because that's when the system tries to operate. Since there is no flow, you get a code. Either the solenoid isn't opening, its plugged with carbon, or there's a hole in the vacuum line from the TB to the solenoid.

The "EVAP" system filters the vent from the fuel tank, and absorbs hydrocarbon vapors in a carbon bed. Then the engine vacuum pulls air in through the carbon bed to remove the fuel vapors, and burn the air/fuel in the engine. Actually helps improve mileage very slightly, and keeps the fuel vapor from stinking things up at the rear of the car.

 

yeah, i knew i had a problem with the vent in my tank becuase sometimes if i leave the Pump handle Flow and walk away,. it click off prematurley... im sure this is related... any suggestions?