Sorry for the simplistic technical post, and I have searched with master Google, where can I find the foam insulation? Also for the valve side.
Thanks.
Thanks.
PCV valve/hose foam insulation
- Thread starter 92LXAZ
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
94SRUNNER
GOLD Star
The new PCV valve and hose come with the foam already on when new. I’ve not seen anyone trying to replace just the foam.
Maybe Granger or McMaster-Carr?
If they are original it may be time to replace if the foam is in that bad of shape.
Maybe Granger or McMaster-Carr?
If they are original it may be time to replace if the foam is in that bad of shape.
- Thread starter
- #3
I just replaced the PCV valve and grommet, it did not come with any foam. I'll look at the hose, maybe it's a kit? But yes this is definitely original.
The foam comes with the hose, which I agree looks to have seen better days. That hose on my 98 from AZ was hard as a rock.
From 1/1998-5/2005:
Hose, Ventilation - 1226150050
Foam for PCV - 1223650010
Foam for Other End - 1223550010
Clamps x2 - 9046715021
From 1/1998-5/2005:
Hose, Ventilation - 1226150050
Foam for PCV - 1223650010
Foam for Other End - 1223550010
Clamps x2 - 9046715021
- Thread starter
- #5
Yep it has, the reason I asked - knew someone would know. Thanks for the part numbers.
Not sure if the toyota parts come with the foam but aftermarket do not come with it.
Just replaced my PCV valve, grommet, hoses and foam with genuine Toyota parts. The foam is an extra part and is not part of the hose or PCV valve.
2001LC
SILVER Star
The foam can get nasty over time. Hitting with HP water tears/pits them, making even worst. Top one you pictured is not very important so don't worry it is just removed. The lower helps keep grommet clean and dust from falling in the head as grommet gets old hardening and shrinks. 98-2002 have a grommet in the head cover that PCV valve fits in. That grommet is better replaced sooner than later as it get "hard" to remove!. The PCV hoses (one on each side of engine) need replacing if hard and cracking. Which hoses seem to only last about 7 years. Make sure to check every vacuum hose at this age, replacing any hard and cracking.
BullElk
SILVER Star
- Thread starter
- #10
I usually go by if Mr. T put it there it should be there if in question, error on that side. I replaced the valve and grommet in our 2006 we used to have and that foam was fine. This one I'll be getting the replacement foam, with my sort of OCD and last statement feels right to me. Seeing the grime around the port and valve cover to me the foam would help.
BullElk
SILVER Star
Did you notice any difference in engine, mpg, etc. ?
- Thread starter
- #12
Oh no. Can't imagine it would affect mpg that much unless the thing was completely inop.
BullElk
SILVER Star
I agree. I just haven't changed one on a hundy and can't even remember why I did on my 80s other than it seemed like a very cheap activity.
2001LC
SILVER Star
The foam isn't all that important, but nice in stick with OEM design. I just clean them and replace. I really don't know what they're for. But on the 200 series they use more foam around top of engine. Which is to muffle the sound.
The rubber grommet that PCV valve set, in the 98-02, is very important. It hardens and shrinks over time. This allows dirt & fluids in the head through the head cover, air leaks around it and PCV valve as well. "A vacuum leak". This reduces vacuums suction of crank case gases, allowing pressure to build in crank case. It also will increase air into intake, causing engine to run lean. You get a higher than normal fuel trim % reading (rich mixture) from this, as system compensates by adding more fuel.
Same applies to the hoses, that is, they create a vacuum leak.
The rubber grommet, is better changed sooner than later. Why, well leaks as valve get lose from the grommet shrinkage. The rubber hardening make difficult to get out of head cover, without dropping pieces of hard dry rubber into head. Then you need to used needle nose or forceps to fish out of head.
The design was changed in 2003. They removed the foam and grommet. Then added threads to the head cover and PCV valve. This is a much better designed IMHO. It does not allow dirt & fluid into head, nor vacuum leak at point it connects to head cover by threads. But just like the 98-02 both hoses need replacing and PCV valve inspected and cleaned regularly. The valve itself needs less cleaning if synthetic oil is used and changed by the book.
03-07 valve is very hard to remove. Because Toyota uses threads locker threads of valve. I use a 12" (large) crescent wrench and get a very tight fit on nut portion of valve.
The rubber grommet that PCV valve set, in the 98-02, is very important. It hardens and shrinks over time. This allows dirt & fluids in the head through the head cover, air leaks around it and PCV valve as well. "A vacuum leak". This reduces vacuums suction of crank case gases, allowing pressure to build in crank case. It also will increase air into intake, causing engine to run lean. You get a higher than normal fuel trim % reading (rich mixture) from this, as system compensates by adding more fuel.
Same applies to the hoses, that is, they create a vacuum leak.
The rubber grommet, is better changed sooner than later. Why, well leaks as valve get lose from the grommet shrinkage. The rubber hardening make difficult to get out of head cover, without dropping pieces of hard dry rubber into head. Then you need to used needle nose or forceps to fish out of head.
The design was changed in 2003. They removed the foam and grommet. Then added threads to the head cover and PCV valve. This is a much better designed IMHO. It does not allow dirt & fluid into head, nor vacuum leak at point it connects to head cover by threads. But just like the 98-02 both hoses need replacing and PCV valve inspected and cleaned regularly. The valve itself needs less cleaning if synthetic oil is used and changed by the book.
03-07 valve is very hard to remove. Because Toyota uses threads locker threads of valve. I use a 12" (large) crescent wrench and get a very tight fit on nut portion of valve.
I have a 2004. I noticed my engine oil cap smelled like gas.
Can leaky pcv hoses cause gas to enter oil? What can cause gas smell in engine oil? Yes I take short trips, which I read causes rich mixture.
(In another thread I complained about gas smell in cabin - I think this happens only after fill up then smell stops happening. I recently changed spark plugs and you noticed I had bad pcv hoses). I plan to replace pcv and some pcv hoses and also coil rubber plugs
2001LC
SILVER Star
Some fuel smell in oil is to be expected with higher mileage. Especially as we nears oil change interval.
Leaky PCV hose is a vacuum leak. I this could cause a lean condition (more oxygen in air/fuel ratio). Then engine ECM will add more fuel to compensate, by way of fuel injectors. So it then is running with more fuel than designed for optimal running. So it may get more fuel in oil than normal. You'd likely see a drop in MPG.
Also fuel injector(s) may leak down, while vehicle sits over night. This fuel gets in oil. Factory allows some leak down. So some fuel may get in oil with age. But if leak down excessive, we get a long crank to start. So a lot of fuel is getting in oil. Fuel smell in oil may be strong.
Biggest concern with PVC hoses leaking air or grommet of 98-02 leaking air, and especially clogged PCV valve. Engine cavity builds excessive internal pressure due to poorly functioning PVC system. This leads to oil seals leaking.
Get the engine all tuned. Run some 44K or Chevron techron in the gas. Than change oil & filter. Do a 4,500 to 5K RPM drive on HWY for 10 minutes. Than smell oil again!
Pay attention to how long engine cranks before starting cold and hot.
Pay attention to MPG.
Leaky PCV hose is a vacuum leak. I this could cause a lean condition (more oxygen in air/fuel ratio). Then engine ECM will add more fuel to compensate, by way of fuel injectors. So it then is running with more fuel than designed for optimal running. So it may get more fuel in oil than normal. You'd likely see a drop in MPG.
Also fuel injector(s) may leak down, while vehicle sits over night. This fuel gets in oil. Factory allows some leak down. So some fuel may get in oil with age. But if leak down excessive, we get a long crank to start. So a lot of fuel is getting in oil. Fuel smell in oil may be strong.
Biggest concern with PVC hoses leaking air or grommet of 98-02 leaking air, and especially clogged PCV valve. Engine cavity builds excessive internal pressure due to poorly functioning PVC system. This leads to oil seals leaking.
Get the engine all tuned. Run some 44K or Chevron techron in the gas. Than change oil & filter. Do a 4,500 to 5K RPM drive on HWY for 10 minutes. Than smell oil again!
Pay attention to how long engine cranks before starting cold and hot.
Pay attention to MPG.
Last edited:
The foam on the PCV hoses and valve are used as insulation to prevent any moisture from freezing since condensation will some times develop. Usually from short trips. If you don’t live in a cold climate then the foam is not really necessary.
2001LC
SILVER Star
I never thought about the foam as insulator to maintain temp. But now that do, it makes perfect sense that foam is and insulator. Especially for cold humid environment. Warm engine air meeting un-insulated cooler hose could build condensation.
I learn something new, so often in mud. Thanks @Sbfreerider.
I learn something new, so often in mud. Thanks @Sbfreerider.
Last edited:
D21FJ60
#LiveLaughLove.
Glad I found this thread. Exactly what I needed. And my comment ensures I don't lose it when I go to order parts
