North American Turbocoupe Organization



vaccum lines blowing off under boost
turbotbirdguy79 Offline
Senior Member
#1
My 88tc is blowing off vaccum lines.My fuel pressure regulater line is blowing off,tranny line is blowing off the vaccum tree and the main vac is blowing off the upper intake.There is oil in it seems like every vaccum line.the car does not smoke compression is great so I dont really think Im getting alot of blowby.Only thing I can think of is the pcv valve,but I took it out and you can only blow through it one way.The breather on the valve cover was replaced by a pcv valve by someone before meand the lines only blow off under boost also.What could be causing this?Im tired of putting hose clamps on every dang line.Any ideas?thanks
1988 Tc,SC50(.63),Bosch BPV,Coolingmist methanol injection activated at 10 psi,FMS big valve 1.89/1.59 head,a234,ported E6,ported lower and upper intake,Gillis,3"downpipe,3"exaust,Kirbin AFPR,255 HP LPH pump,Racer Walsh adj cam pully 2* advanced*,K&N cone,MSD Blaster,autolite 103 plugs,T5 swap,3.73s,shifter,Centerforce stage 2 clutch,motorcraft tuneup.
Reply

Pete D Offline
Administrator
#2
How much boost are you running????
I'm an advocate of clamping some lines but for most it isn't uysually necessary, ASSUMING the line itself is in reasonably good condition. Meaning plyable and not stretched and dried. If your lines are like that then replace them.

If you got noticable oil in the vacuum lines it's either a from the breather or leaking past the compressor seal. See what the inside of the IC,& TB look like
Pete Dunham


Reply

turbotbirdguy79 Offline
Senior Member
#3
The intercooler has no traces of oil in it.The vac lines are all good and the turbo is not leaking (ther is some oil residue in the compressor housing but I think that would be from the breather though)Would that pcv on the valve cover be letting too much oil in?Maybe I should go get a breather from the boneyard and go from there?Thanks again pete, your the man!
1988 Tc,SC50(.63),Bosch BPV,Coolingmist methanol injection activated at 10 psi,FMS big valve 1.89/1.59 head,a234,ported E6,ported lower and upper intake,Gillis,3"downpipe,3"exaust,Kirbin AFPR,255 HP LPH pump,Racer Walsh adj cam pully 2* advanced*,K&N cone,MSD Blaster,autolite 103 plugs,T5 swap,3.73s,shifter,Centerforce stage 2 clutch,motorcraft tuneup.
Reply

turbotbirdguy79 Offline
Senior Member
#4
Oh I forgot A t3 60/48 at 20 psi.
1988 Tc,SC50(.63),Bosch BPV,Coolingmist methanol injection activated at 10 psi,FMS big valve 1.89/1.59 head,a234,ported E6,ported lower and upper intake,Gillis,3"downpipe,3"exaust,Kirbin AFPR,255 HP LPH pump,Racer Walsh adj cam pully 2* advanced*,K&N cone,MSD Blaster,autolite 103 plugs,T5 swap,3.73s,shifter,Centerforce stage 2 clutch,motorcraft tuneup.
Reply

Jeff K Offline
Administrator
#5
I use small size tie wraps on most of the vac lines that see boost as cheap insurance against blowing off. Looks better than hose clamps, and cheaper too.

------------------
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 21 psi, forced air intercooler, water injection, bypass valve, Ranger roller cam, subframes, etc., etc.. // 86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP nitrous, ignition, gears, suspension, etc., etc.... // 91 Escort: Bone stock winter car // 02 Taurus Vulcan(wifes car)
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
Reply

Pete D Offline
Administrator
#6
You kinda got me stumped. You got presence of oil in the compressor housing, none in the intercooler and yet oil in the vacuum lines.
Which vacuum lines - any?, all? only certain one(s)?

A couple thoughts: 1. you tested the pcv by the distributor. I asssume you blew through the small end and it would pass no air at all, right? 2. you mentioned a one way only valve at the breather. I think you need to replace that with something that passes air in both directions. My theory is the stock breather passes air in both directions depending on the state the engine is in, boost or vacuum. This may not affect the hoses blowing off issue but it may make a difference in where you find oil

[This message has been edited by Pete D (edited 09-13-2004).]
Pete Dunham


Reply

turbotbirdguy79 Offline
Senior Member
#7
Pete,I have a VERY light film of oil in the compressor housing and none that I can see In the intercooler.Im blowing off the FP hose,trans vaccum line,The main vac hose that goes to the upper intake (one that goes too the tree that connects to the upper intake)Im also stumped.I blew on the small side of the pcv.Maybe ill just replace the pcv valve,they are cheap so ill go that route.Thanks again
1988 Tc,SC50(.63),Bosch BPV,Coolingmist methanol injection activated at 10 psi,FMS big valve 1.89/1.59 head,a234,ported E6,ported lower and upper intake,Gillis,3"downpipe,3"exaust,Kirbin AFPR,255 HP LPH pump,Racer Walsh adj cam pully 2* advanced*,K&N cone,MSD Blaster,autolite 103 plugs,T5 swap,3.73s,shifter,Centerforce stage 2 clutch,motorcraft tuneup.
Reply

Pete D Offline
Administrator
#8
I'm not up on auto trans but is there any chance that oil is from the trans, getting sucked up the hose from the trans?????

[This message has been edited by Pete D (edited 09-13-2004).]
Pete Dunham


Reply

turbotbirdguy79 Offline
Senior Member
#9
never thought about that.Maybe I overfilled the trans.Ill check tommorow morning,thanks again pete.
1988 Tc,SC50(.63),Bosch BPV,Coolingmist methanol injection activated at 10 psi,FMS big valve 1.89/1.59 head,a234,ported E6,ported lower and upper intake,Gillis,3"downpipe,3"exaust,Kirbin AFPR,255 HP LPH pump,Racer Walsh adj cam pully 2* advanced*,K&N cone,MSD Blaster,autolite 103 plugs,T5 swap,3.73s,shifter,Centerforce stage 2 clutch,motorcraft tuneup.
Reply

Jeff K Offline
Administrator
#10
A blown diaphram in the tranny vac modulator will cause oil to get sucked into the intake. Seen this happen personally a few times in the last 30 years or so.

------------------
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 21 psi, forced air intercooler, water injection, bypass valve, Ranger roller cam, subframes, etc., etc.. // 86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP nitrous, ignition, gears, suspension, etc., etc.... // 91 Escort: Bone stock winter car // 02 Taurus Vulcan(wifes car)
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
Reply





Users browsing this thread:
1 Guest(s)



Theme © iAndrew 2018 - Software MyBB