Should PCV pull suction when idling?
01-29-2024, 09:29 AM
#1
Should PCV pull suction when idling?
I have a 70K mile L98. The PCV system is working as far as I know. With engine running I can pull the hose and PCV valve off of the driver side valve cover and put my finger over the port on the PCV valve and it has suction. Don't see any blowby and I can pull the filler cap and no oil smoke coming out. I keep having an oil leak at the back china wall and not sure if its user error while installing or if I am having other issues. The cars runs like a champ, idles smooth, no check engine light etc.
At idle, there isn't a leak but when I throttle it a little, oil seeps out from under the intake at the rear china wall. I did mess up the install the first time and think I messed it up again.
At idle, there isn't a leak but when I throttle it a little, oil seeps out from under the intake at the rear china wall. I did mess up the install the first time and think I messed it up again.
01-29-2024, 11:00 AM
#2
Senior Member
Re: Should PCV pull suction when idling?
Sounds like you need to pull the intake and regasket the China wall again.
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Komet (01-30-2024)
01-29-2024, 11:40 PM
#3
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Car: 1988 Trans Am GTA
Engine: 5.7 L98
Transmission: 700r4
Axle/Gears: Borg Warner 9 bolt 3.27
Re: Should PCV pull suction when idling?
I have a 70K mile L98. The PCV system is working as far as I know. With engine running I can pull the hose and PCV valve off of the driver side valve cover and put my finger over the port on the PCV valve and it has suction. Don't see any blowby and I can pull the filler cap and no oil smoke coming out. I keep having an oil leak at the back china wall and not sure if its user error while installing or if I am having other issues. The cars runs like a champ, idles smooth, no check engine light etc.
At idle, there isn't a leak but when I throttle it a little, oil seeps out from under the intake at the rear china wall. I did mess up the install the first time and think I messed it up again.
At idle, there isn't a leak but when I throttle it a little, oil seeps out from under the intake at the rear china wall. I did mess up the install the first time and think I messed it up again.
01-30-2024, 05:13 AM
#4
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Should PCV pull suction when idling?
Could also be the oil pressure sending unit or stand off fitting for it.
01-30-2024, 06:07 PM
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Car: 1989-92 FORMULA350 305 92 Hawkclone
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Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Should PCV pull suction when idling?
Yes, there will be suction on that valve, it opens and closes.
With rpm, oil psi builds and blows up between distributor and block in the valley area. Then depending on intake design, it can blow out the rear chinawall.
With rpm, oil psi builds and blows up between distributor and block in the valley area. Then depending on intake design, it can blow out the rear chinawall.
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