Let's verify the EVAP VSV again. When you get a P0441 EVAP Purge Flow problem it's usually the VSV. It gets old and gums up.
You can test it by removing the hose on the canister side. Run the warm engine and you should (test 1) hear loud vacuum at the open port. If you don't then the VSV needs to be cleaned again or replaced.
In addition, (test 2) use a volt meter and measure the battery voltage at the connector. Let's also make sure the VSV is getting battery voltage.
Did you pry back the metal tabs and clean it inside? Be careful the tabs break.
If the VSV is operating properly, then maybe you have a vacuum problem in the tank. Just remove the gas cap temporarily and see if that solves the problem. There are two types of gas caps, IIRC, one has both a pressure relief valve and a vacuum valve. The other just vacuum valve. (I can't remember exactly the combination however). There should be another vent port on the canister, IIRC.
And for P0110 this helps the ECU decide mixture, so it's important to get it right. Check the resistance at various temperatures and see if the ohm readings generally agree with spec. Also check the readings at the ECU connector inside the cabin as well for a more thorough check. I suspect the solder and tape connection may be no good?
I wonder if you should test by using a 300 ohm resistor in place of the IAT. Or just directly jumper the wires on the ECU side to simulate a hot summer day (ECU will add fuel later, resulting in + fuel trim, probably pegged too). But redo the wiring first. Maybe using a Posi-lock type connector. Find them at your local parts store.
http://www.posi-lock.com/
Test 3. I think you may have a dirty idle air control valve as well. Remove it completely and disassemble it to clean. This is a poor design, using duty cycled magnets to turn the vane and is just not strong enough.
Quote:
Originally Posted by ycartf
We have had a P0441 CEL thrown every few months or so, and all I did for a while was clear it and go. But recently the car has gotten to where at low RPM's it would idle so low that a couple of times it cut off at a light. This was no big deal if I were driving, but my teenage daughter was a little spooked by it. I researched the code and found that if I unplugged the vacuum hose leading from the intake to the EVAP VSV (the rear hose on the component that is on the intake hose that has two hoses and an electric connection on it) it would run fine. The rear hose has constant vacuum when I put a finger in front of it, but it runs fine with it disconnected. I should add that the wires to this were gnawed also, but not severed at any time and not damaged nearly as much. I also repaired these wires.
So recently it threw the P0110 CEL again and the wire is intact (no gnawing this time). So I thought maybe the two codes were tied together (the wires leading to both tee into a main feed after all). I dismantled the EVAP VSV, cleaned it good with some MAF sensor cleaner (figured it would be safe), reassembled it, and replaced it. I reconnected the vacuum hose to the EVAP VSV (that rear one that leads to the intake) and tried it out. It still has the low idle if I connect it while running, but not as bad if I start it with the hose connected. But the weird thing is, the P0110 CEL will not stay cleared. I can clear it with my ScanGauge and it reappears a second later.
So what am I probably up against and what will it hurt to run like it is? I live in an area where it does not have to pass an emissions inspection or anything. I would like to fix it, but do not want to just throw expensive parts at it until I replace the right thing (I try not to do that with any car repairs I perform). I figured with my rodent damage and disconnected hose, my circumstances were unique enough to warrant a thread requesting help. I would greatly appreciate any experiences or knowledge on this and thank you in advance.
Tracy
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