What were the codes? What was the 4th code for (you said 4, but mentioned only 3)?
You bought it as is, running like this you mean?
How many miles?

 

The codes were P0449, P0455, P0430 and P0420. 230,000 miles and it didn't run like it does now when I test drove it. It's progressively getting worse

 

And just one code now?

 

Yes, the code for the vent canister solenoid. The one sitting on top of the fuel tank I just had replaced last wednesday

 

The P0449 code description is "EVAP Canister Vent Solenoid Valve Control Circuit" and this particular code points to an open (broken) wire or bad connection.

Are you doing the troubleshooting yourself?

 

Yes, trying to troubleshoot myself but brought to muffler man to do a smoke test for any leaks. So, to you it's most likely bad wires/connection?

 

I've attached the schematic for the evap.

Also, take this with a HUGE grain of salt but like 10 years ago, back before I began documenting everything I do to my cars, I had some sort of vent valve code on my silverado. The system appears exactly the same, 3 wire fuel pressure sensor and 2 wire vent vlv control circuit. Anyway it was throwing a vent valve code, maybe a 449 like this (maybe it wasn't this exact code, I'm old so you have to forgive me). Anyway, the vent valve was working as advertised except for the code. So I got to wondering how the computer knew what the valve was doing, there's no feedback on position or anything. Anyway, the way it knew what the valve was doing was via the fuel tank pressure sensor. I didn't have a code for that but the pressure was stuck at ambient. It was a bad pressure sensor.

I bring this up because you had a 455 code, that's fuel tank pressure. Maybe the hole in the plumbing solved that, I don't know, I don't have the car in front of me and I can only take wild guesses at it why after all you've done it's still fussing.

 

Maybe it's wiring, you have (had) codes that would lead me in different directions. But troubleshooting it isn't crazy hard.

Don't know your capabilities or tooling. Got a scan tool? Command it on and off and listen.

Got a jumper wire and do you tend to be careful with connector pins? Ground the ecm X1 pin 6 wire with the key on (that cnstr/vent fuse hot) and listen.

Or some other method to check the wiring.

 

I just took it to muffler man today and they will do the smoke test tomorrow. I don't know but will this show if it's the pressure sensor and is that a fuel pressor sensor?

 

Not fuel pressure sensor, it's the fuel TANK pressure sensor.

I don't think smoke will help troubleshoot the tank pressure sensor. Smoke is just for air leaks.

Based on the 449 code I'd be shooting wiring and if that's ok, check the tank pressure sensor.

 

When I took it to AutoZone today they didn't have a code on the printed paper. It just printed out canister purge valve. So, could it be bad wiring or maybe a bad PCM fuse? I should have muffler man check for wiring issues before the smoke test?

 

You need to stop taking it to AutoZone and pick up your own code reader. For reliable help in this forum, you really need to know the codes. Relating symptoms is not always helpful.

Assuming you still have a P0449, here are the possible causes.

 

I didn't know AutoZone isn't reliable. I think the only thing that hasn't been checked is the wiring and the fuel tank pressure sensor which Hex mentioned.
Thank you!

 

They are not reliable if they did not give you the actual trouble codes, which are very useful for help on this forum.

 

I want to emphasize a couple things, in my book that is specific to the acadia (and traverse, outlook and the buick one), it is explicit that this is a circuit code and the fault is high resistance or an open to the vent valve. There are other codes that cover other fault scenarios like shorts or tank pressure or leaks. This code says open/high resistance on the vent valve circuit.

Also, I'm not confident mentioning the tank pressure sensor is a good direction, I said that based on a vague memory on a different vehicle, even though the system appears the same. I probably should have not mentioned it.

This is thread on this forum where the person had this code and thankfully actually came back and posted the fix:

https://www.acadiaforum.net/threads/p0449-on-2007-acadia-solved.12624/?post_id=215403#post-215403

Consider mentioning this to the Muffler Man, the Muffler Man, the Muffler Man. Who lives on Drury lane.

 

Well, I took it to a reliable car shop. They took it for a test drive. They say it's the transmission. Why does the codes come up emissions? When I sit and idle, it smells of exhaust bad. Going to another shop to have a transmission installed but first I want him to check to see if it could be something else like maybe the wires connecting to the spark plugs(those have just recently been charged)