P0455 and P0442 Return... '98 V70 GLT

Post by **bmdubya1198** » 30 Aug 2017, 12:13

Yeah, I know to check the usual suspects. I'm lost though.
I have checked absolutely EVERYWHERE for vacuum leaks, and there aren't any obvious leaks. I checked the J-hose, L-hose, the vacuum line to the purge valve, the line from the charcoal canister to the fuel filler neck (as well as the seal on the quick connect), and gas cap seal, the fuel filler neck seal, purge valve to manifold hose, all TCV hoses, CBV hose, brake booster hose, fuel pressure regulator hose, and whatever other hoses I can't think of right now as well as replaced the purge valve, and nothing has changed.
The car has an occasion rough idle, but only when warm, and it really isn't too rough as much as it is just odd. It will pulse up and down slightly, but only occasionally and only when the CEL is on.
What other places could there be a leak? The only thing I can think of right now that could possibly be leaking is the fuel pump seal, which I already replaced when I replaced my fuel pump.
When I removed the fuel pump access cover, I can smell a hint of gas (nothing TOO strong) but I figured it was from the little vent on the fuel pump housing. Is that normal or is that reason to re-seat the seal? I've re-seated it multiple times, and I don't think I can get it any straighter than it is.

Post by **sleddriver** » 30 Aug 2017, 16:18

Yep...me too. P0455 returneth.....time to smoke it again.

Post by **Roger_850T** » 30 Aug 2017, 19:14

I think when I ran into this, I had to replace the solenoid valve that's mounted on the radiator, between the canister and the intake vacuum.

Roger

Post by **bmdubya1198** » 30 Aug 2017, 20:44

Roger_850T wrote: ↑30 Aug 2017, 19:14 I think when I ran into this, I had to replace the solenoid valve that's mounted on the radiator, between the canister and the intake vacuum.

Roger

Yeah, that's the purge valve. I replaced that already. Unless I replaced it with a bad one (which is possible), I don't think it's an issue.

Post by **jreed** » 31 Aug 2017, 05:01

It's less likely, but there could be a crack in the charcoal cannister or one of the check valves.

Post by **bmdubya1198** » 31 Aug 2017, 08:53

jreed wrote: ↑31 Aug 2017, 05:01 It's less likely, but there could be a crack in the charcoal cannister or one of the check valves.

I'll have to take a close look at those. I guess anything's possible.

Post by **bmdubya1198** » 01 Sep 2017, 08:02

Anybody have any other ideas?

Post by **wizechatmgr** » 01 Sep 2017, 08:38

I've learned to live with my P0455 - mine only goes on in city traffic. I do mostly highway miles. I get it an average of every 3-4 weeks. I suspect mine could be the gas cap seal but haven't replaced it yet.

P0422 - does it smell like rotten eggs at the exhaust?

Post by **bmdubya1198** » 01 Sep 2017, 11:33

wizechatmgr wrote: ↑01 Sep 2017, 08:38 I've learned to live with my P0455 - mine only goes on in city traffic. I do mostly highway miles. I get it an average of every 3-4 weeks. I suspect mine could be the gas cap seal but haven't replaced it yet.

P0422 - does it smell like rotten eggs at the exhaust?

It actually does occasionally. Nothing too bad, probably closer to burnt carbon deposit smell.

No, I'm not replacing my cat

.

Post by **scot850** » 01 Sep 2017, 11:47

I googled P0422 Volvo code and there are a bunch of different issues that have caused this. One unlikely one I would never have looked at is the air-intake sensor which had a broken clip on one side which threw a code only in city driving but not on the highway. Other issues were the rear O2 sensor, and a sensor measuring issue fixed by putting in a spacer in the rear O2 sensor.

Worth doing the google search and read the threads for further ideas as there are several.

Neil.