|
|
Ok, awhile back I was asking about this code and got some good advise.
I got under car and checked out the hoses to the EVAP canister and yep, both were split so I replaced them. Reset the CEL, waited till all systems read "ready" and then took it into for emissions inspection.
It passed with flying colors.
Here's where it gets weird.
So the CEL comes on again and yes, you guessed it, code 455, and now not all systems are ready. I reset the CEL, and sure enough it comes on again. I read the codes, still 455, and all systems are now ready. What?
So I reset again. CEL comes on, code 455, systems ready, and this time I notice that MIL states Off. What???
Ok, so I'm losing my mind here. What is going on? Is 455 really being thrown if so, what should I look to replace next? I did buy the purge solenoid valve, but the one I bought is for a different year, opps. The one I need sits to the right of the radiator fan.
Is this what I should be replacing next?? Any ideas or suggestions are welcome on this as I'm tired of the light being on.
Thanks in advance,
Matt
|
|
-
|
|
|
The same access panel you needed to repl the fuel filter, under the panel behind the rear seat. I had a hose split next to the filter, but that gave me a p0422.
The code you see is a preliminary code, the system will log the number of times it gets the same code and after a couple of times, it will turn on the light.
When you erase a code, the computer will have a not ready status until the drive cycle is complete.
Klaus
--
Always willing to listen, just not able to take direction.
|
|
-
|
|
|
You can get the purge valve you need at a junkyard for <$10, the one from the 850 works for you too. Your profile says you're in Sykesville, I'm not far here in Ellicott City, and I might have one sitting around. If you want it, let me know and I'll look to see if I've still got it.
But I doubt that is the cause. I'd look in your trunk where the access holes are for the fuel filter for a small valve on that bracket. If I had to guess I'd say that hose had crapped out on you as well and is whats causing the problem now. If it looks good, you might want to try plugging the hoses where you can (ie a the purge valve and at that valve in the trunk) and blow on either one attached to the charcoal canister and see which has a hole in it. Then start searching!
Which canister do you have? Round or rectangular, and how many hoses come off of it?
--
If you're not driving it "like its stolen," are you really driving?
|
|
-
|
|
|
tmanian,
I have the rectangular evap canister near the passenger rear wheel. I've replaced both hoses going to the evap canister as both had huge gashes in them.
I replaced the fuel filter while I was down there, but didn't see any valve except for the one for the evap canister.
Where else should I be checking?
As for all my valves from the rear to the front I did check them all on the battery while I each one out and they all seem to work, or at least they made a clicking noise when voltage was applied to them.
So maybe I do have another hose that I just know about.
Where is the access panel in the back??
Let me know when you get a chance.
Thanks in advance,
Matt
P.S. I do live near Sykesville, actually Eldersburg. Nice knowing that there are others near by if I need advice or help.
|
|
-
|
|
|
Lets see, your car is not a typical V70. Do you know where your fuel filter is? Now that I think of it I believe it should be a foot or so before the passenger rear wheel. IF it is there, then undo the bolt holding the filter bracket and let it hang down. On top of that is a small roll-over valve that should have two vacuum lines connected to it. In the vicinity should also be a T connector that would have the line from your car, its continuation to the EVAP canister and the third line off to the roll-over valve. I'm guessing one of those 5 connections has crapped out.
--
If you're not driving it "like its stolen," are you really driving?
|
|
-
|
|
|
Finally got a chance to get under the 70 last night and I've checked everything one last time.
All the hoses are intact. All the valves work as intended. My CEL has not come on, but it says that there is one pending code, you guessed it, 0455, and the EVAP system was not ready yet, but all others were.
I cleared it out as I had the system opened and I didn't want it to throw a false code.
I finally know how the whole system works now at least. There is large hose coming from the top of the fuel tank that I guess the fumes or gas can flow down into the canister. Then there is another smaller hose that has a connection on the top of the tank, which I've not checked yet as I don't know how to gain access to the pump yet, and also runs to the front of the car where it is connected to a valve that is closed when the car is off and then is opened for a short time by the computer to make the car run richer. The computer senses this and then shuts the valve. This valve works fine. Closes and opens correctly and makes a nice tight seal. So no leaks there.
Back at the EVAP canister there is the dreaded J-hose coming off the canister and running to another valve. I've replaced both hoses both the J-hose and the other one as they were both cracked. Both hoses here connect to another valve which is open when the car is off, and closed while the car is running so as to trap fumes in the canister while running, at least that is what I think.
The other somewhat J-hose from the valve follows another hose that runs to the fuel filler neck and some other plastic thing that I don't know what it does. I checked its hoses and they appear intact. I was able to blow air through this hose and hear it come out this plastic device that attaches to the filler tube. I been able to blow air both ways on this tube so I'm wondering is this where my leak is?
So my question is what is this device and how is it supposed to operate? If this is the culprit, how do I replace it, where do I get it, and how much is it going to cost?
Well I believe that to be it. I don't think I've over looked anything at this time except for the one hose going to the top of the tank, but I feel pretty confident that it is not the problem.
All replies are welcomed.
Thanks in advance,
Matt
|
|
-
|
|
|
I might have more after I digest all that you wrote, but the plastic thing by the fuel filter is your rollover valve. As long as its upright, air should go both ways, but if you roll the car it'll keep fuel from spilling out.
Your gas cap is relatively new/good condition right? If so, it seems that everything in front of the filler pipe is working. So (AFAIK) that leaves the fuel tank pressure sensor, the filler pipe, or a blockage in the pressure sensor pipe. None of those are fun to replace. If you can't smell vapors when/right after you fill its probably not the filler pipe. You might try over-filling to see if it'll leak out the pipe.
Fuel tank pressure sensor requires you to drop the tank, not fun. At least until the code comes on for real, not just pending, before you undertake that amount of work. And you should probably confirm no leaks with a smoke test before you drop it too..
--
If you're not driving it "like its stolen," are you really driving?
|
|
-
|
|
|
Had my mechanic perform a smoke test today.
Confirmed that the purge valve is indeed bad. Blah!
Apparently I didn't test it long enough as it was a slow leak.
At least now I know and I can fix it and put it behind me.
Hate having a CEL when I don't need to.
Thanks everyone for all your help and insight.
Matt
|
|
-
|
|
|
YAY! Its always a great feeling to have no lights on.
--
If you're not driving it "like its stolen," are you really driving?
|
|
-
|
|
|
First off, great post. Very informative and insightful.
I now understand the whole system.
The filler cap is original however I have replace the rubber seal. I tried putting a new one on from FCP but I didn't like it as it didn't attach to the door. So I removed the seal from it and put it on the original one.
Currently do not smell fumes in any way shape or form. I usually fill it up pretty far when I get gas and still I smell nothing.
This coming Monday, I'm having all the wheels aligned so my mechanic will have it. I'm going to have him do a smoke test on it and tell me what he finds from it.
I don't think he'll find anything.
If no leak then where?
What does the fuel tank pressure sensor do and where exactly is it located? Where is the pressure sensor pipe located as well?
Thanks for all your information. I'm so close to fixing this thing that I can smell it!
I'll let you all know what I find out next week.
Regards,
Matt
|
|
-
|
|
|
The 1998 AWD is a little different, but, the hose that goes to the top of the fuel tank is there to send fumes to the cannister when the engine is off. The hose on my 1998 is quite rubust, feels like a fuel line hose rather than a vacuum line. The only way to look at the tank end is to drop the tank, which is probably not needed.
The line from the tank to the filler tube used to have problems in the 850s, it would crack at the base and people smelled vapors after being parked over night. It is a PITA but can be replaced, but I would only do that if I smelled fumes.
Have you tried a thin coat of petroleum jelly on the gas cap gasket? The filler neck can get beaten up by the nozzle and eventually allow a leak.
Klaus
--
Always willing to listen, just not able to take direction.
|
|
-
|
|
|
If the problem is a leak a smoke test is probably the only way to find it.
I can't help with the sensors stuff. You already know a lot more about the EVAP system than most of us do.
--
1998 V70 AWD->FWD->AWD Turbo 215k+
|
|
-
|
|
|
Gosh its hot outside here in Maryland!
Anyway, just wanted to let you know that I checked all the hoses and they all appear to be fine. So here is what I've done.
I disconnected the hose from the purge solenoid up by the fan. I then proceeded to blow compressed air at about 10 PSI into the system.
I didn't feel or hear anything so I turned the pressure up to about 60 or so. Now I could hear it coming backing into the EVAP Canister. I then disconnected the small hose from the canister and blew air through that from the front and I could feel it, however I couldn't plug that one well enough so I may still need to check that hose that goes up to the tank. So a question here is how do I access those hose ends without dropping the tank? Where is the access panel in a 98' V70 for the fuel pump and what do I have to remove to get to it.
Ok, now back to the canister. I then disconnected the large hose that also goes up to the tank. I blew air in there and once I stopped I could feel the air rush back down and I could smell the gasoline. I feel really strong that this hose is fine.
So I went ahead and reconnected both hoses. In doing so I 1) broke the little yellow piece that clamps that large hose back onto the evap canister, and 2) I noticed that there is a lip on the EVAP Canister that the large hose needs to be over all the way for the yellow clip to work correctly. I'm not sure, but I don't think the hose when I removed it was over that lip. If that's the case then that would be my leak.
After all was assembled I blew air down the line again from the front of the car and I could swear that I heard air coming out of the top of the EVAP canister. I did it several times to make sure, so is this possible? How often does the EVAP canister go bad or spring a leak? I didn't check for one as I reset the MIL and am hoping that the large hose was the culprit as it may have not been seated correctly.
So does any of this sound plausible?
So here's what I'm going to do if the light comes back on...
1. pull the canister and check it. If it has a leak or a crack I'm going to try to seal it with RTV or something. The last thing I want to do is buy a new one.
2. Try to purchase just the little yellow clip for the large host to make sure it doesn't move, slip back or come off.
3. access the fuel pump area in an attempt to check those hoses that go back there to feed the fumes back and see if they are cracked or not. hopefully not cracked.
4. If none of these are the culprits, then it has to be one of the vales, either the one by the evap canister or the one by the radiator. Any suggestion as to which one to replace first?
Thanks in advance, looking forward to responses.
Matt
|
|
-
|
|
|
Yep, today's another scorcher. Just finished an oil change, I probably lost more sweat than I put oil in the car!
I might have just had an Eureka! moment. That big hose is the J-hose that goes bad on S70s all the time . You can replace that broken clip with a hose clamp, and it'll hold it tight, but the hose itself might be cracked. They're not too expensive, I think you can get them for 10-15 online, and probably 15-20 up at Koons.
I don't know if you've seen this, but here's a parts list of your emissions system. It might help you trace things.
I'd take replacing the canister off your list (at least for now) it hardly ever goes bad. If you replace the clamps and the J-hose and you're still having problems, I'd try topping off your tank. The fill tube on occasion cracks and if you get extra fuel in there it'll leak out. If you fill up and you can really smell vapors after you top it a little you might have to replace that tube.
--
If you're not driving it "like its stolen," are you really driving?
|
|
-
|
|
|
ok, just checked under the car at the fuel filter. There are two hoses their that were split and I've already replaced them.
There is also some valve there as well. Could this have gone bad? I did check it when I was in there earlier and it appeared to click.
Any suggestions here would be greatly appreciated.
Thanks in advance,
Matt
|
|
|
|
|
