Failed Glove Test after replacement of PCV system

StubZz · Post by **StubZz** » 07 Dec 2017, 23:59

Hi all!

I just replaced my PCV system, with the modifications outlined in this forum post. After I did, I felt like doing the glove test, which I failed. I also got the error code P0505, which I assume is for the IAC valve, because when I idle my car sounds like a diesel, so I'm going to clean the valve soon. Could that be a factor in failing the glove test? I also am planning on replacing the flame trap, could that also be a factor? My car is the 1998 Volvo V70 wagon, 2.4L DOHC non-turbo engine. Also, the little vacuum line on the side of the Air Intake Manifold, where does that connect to? I would assume it goes onto the flame trap, but I found a disconnected vacuum line on the back top of the airbox, there are 2 vacuum lines in the back, the bottom one is connected somewhere, but I don't know where the top one gets connected to.

Thank you all so much for the help, it is very much appreciated!

Post by **abscate** » 08 Dec 2017, 01:37

One of. The vacuum line attaches to the air door on the air cleaner box and the other goes to vacuum tree. The little elbows break and split and should be replaced if you touch them. The hoses can go to either port on the back of the air cleaner housing, it doesn't matter which one.

The two connections are a thermostat switch which let engine vacuum go to operate the air cleaner air valve, and regulate incoming air temperature

This is only on non-turbo cars

Post by **erikv11** » 08 Dec 2017, 08:16

Check this out for vacuum lines: viewtopic.php?t=65002

With using cheap heater hose for the PCV one risk is that it gets kinked under the intake manifold, are you sure that's not happening? Hoses not accidentally switched on the top of the oil trap?

StubZz · Post by **StubZz** » 08 Dec 2017, 12:39

erikv11 wrote: ↑08 Dec 2017, 08:16 Check this out for vacuum lines: viewtopic.php?t=65002

With using cheap heater hose for the PCV one risk is that it gets kinked under the intake manifold, are you sure that's not happening? Hoses not accidentally switched on the top of the oil trap?

I made sure the hose wasn't kinked, I took off the manifold several times to make sure of that! I am also positive the hoses are in the right spots, because if you look at it straight on, the one to the back and left is the one that goes up to the top of the engine, and the one in front and to the right goes to the flame trap. Is this correct?

Post by **erikv11** » 08 Dec 2017, 12:45

That's correct.

Did you throw away the flame trap disc? Or at least make sure the little holes are well cleaned out.

No other good ideas here right now ... maybe there is just a lot of blowby on the rings. How many miles on the engine?

StubZz · Post by **StubZz** » 08 Dec 2017, 12:47

erikv11 wrote: ↑08 Dec 2017, 08:16 Check this out for vacuum lines: viewtopic.php?t=65002

With using cheap heater hose for the PCV one risk is that it gets kinked under the intake manifold, are you sure that's not happening? Hoses not accidentally switched on the top of the oil trap?

I made sure the hose wasn't kinked, I took off the manifold several times to make sure of that! I am also positive the hoses are in the right spots, because if you look at it straight on, the one to the back and left is the one that goes up to the top of the engine, and the one in front and to the right goes to the flame trap. Is this correct?

Edit: I just looked at the link you sent, and hose line 2, vacuum tree to the airbox cover, upper nipple, is not connected to the top of the vacuum tree, that port is actually broken off and covered with duct tape, so I'm going to get a new vacuum tree soon. Since that vacuum line is not even connected, could that have something to do with the failed glove test or the error code P0505? Could it make my idling very rough, or is that unlikely?

StubZz · Post by **StubZz** » 08 Dec 2017, 12:51

erikv11 wrote: ↑08 Dec 2017, 12:45 That's correct.

Did you throw away the flame trap disc? Or at least make sure the little holes are well cleaned out.

No other good ideas here right now ... maybe there is just a lot of blowby on the rings. How many miles on the engine?

My flame trap doesn't even have a disc in it, I got this car used and it has not had it since before I got it. It doesn't even have the O ring. I am having some trouble with finding one that will fit my car, once I find one I'll replace it. The engine's mileage is around 223k

Post by **erikv11** » 08 Dec 2017, 13:10

StubZz wrote: ↑08 Dec 2017, 12:47
Edit: I just looked at the link you sent, and hose line 2, vacuum tree to the airbox cover, upper nipple, is not connected to the top of the vacuum tree, that port is actually broken off and covered with duct tape, so I'm going to get a new vacuum tree soon. Since that vacuum line is not even connected, could that have something to do with the failed glove test or the error code P0505? Could it make my idling very rough, or is that unlikely?

That disconnected hose shouldn't affect idle, however if the duct tape is leaking at the tree, that could make it stumble a little. I'd expect a code like p0172 or similar, but you don't always see them with a vacuum leak.

You could also have a leak at the o-ring on the flame trap housing, I would seal that up. I've gooped on RTV before. Not pretty but it works.

The p0505 is an oddball, does it come back after you clear it? Cleaning out the IAC is a very good idea regardless, I would clean the throttle body too (but don't get carb cleaner inside the TPS).

StubZz · Post by **StubZz** » 10 Dec 2017, 15:53

erikv11 wrote: ↑08 Dec 2017, 13:10
StubZz wrote: ↑08 Dec 2017, 12:47
Edit: I just looked at the link you sent, and hose line 2, vacuum tree to the airbox cover, upper nipple, is not connected to the top of the vacuum tree, that port is actually broken off and covered with duct tape, so I'm going to get a new vacuum tree soon. Since that vacuum line is not even connected, could that have something to do with the failed glove test or the error code P0505? Could it make my idling very rough, or is that unlikely?
That disconnected hose shouldn't affect idle, however if the duct tape is leaking at the tree, that could make it stumble a little. I'd expect a code like p0172 or similar, but you don't always see them with a vacuum leak.

You could also have a leak at the o-ring on the flame trap housing, I would seal that up. I've gooped on RTV before. Not pretty but it works.

The p0505 is an oddball, does it come back after you clear it? Cleaning out the IAC is a very good idea regardless, I would clean the throttle body too (but don't get carb cleaner inside the TPS).

For the throttle body should I use throttle body cleaner? I ordered a new flame trap that comes with the o ring and filter. I also ordered a replacement vacuum tree. The only code I get is P0505, even after disconnecting and reconnecting the battery.

Post by **erikv11** » 10 Dec 2017, 19:08

I would use carb cleaner, just don't let it spray all over the place. Throttle body cleaner is probably the same thing, marked up a buck or two. Use whatever is cheap and easy to get, you're only wiping away a bit of oil and carbon. And it's fine for traces of any combustible cleaner to get into the intake, certainly carb cleaner is OK. TPS is throttle position sensor - you don't want it filling up with solvent, just keep an eye on it don't overspray.