lolumad
Probationary Member
- 15
- 1
- Feb 26, 2013
-
sarasota,
Florida
Howdy dsmers. I've been stuck on this for a while now. I've posted for help on the newbie forum (facebook ) and have boost leak tested my turd (1995 GST). I recently engine swapped this 95' cam angle sensor replacement. Here are some important health tests I JUST ran..
I went in this sequence to get where I am at.
BLT(NOGOOD)-> COMPRESSION TEST(170's) -> LEAK DOWN(NO HISSING)
Leak down was done with PCV vacuum capped.. as well as valve cover.
Leak down test, @ 90psi through a compression tester hose (my harbor freight tester only testw15psi)
What I did was take a pvc pipe and listened inside the TB elbow, stuck my ear by the exhaust.. & felt w a wet finger on the dipstick tube. All cylinders were checked @ TDC.
-intake no hissing,
-exhaust no hissing
-dipstick not even a little bit (thank GOD)
The compression numbers were impressive to say the least
170 across the board (all performed dry..)
& this engine supposedly had 145k & also was supposedly a 98' style block (BS cause the cam gears etc)
Boost leak test:
was the weirdest test EVER.
I've done BLT on my cars before. Easy process.. I've never had to find TDC @ *30 PTDC. So what I did AT FIRST was.. Just attach the BLT to the turbo.. waited and listened.. Found several boost leaks mostly were the couplers. SO i cranked those down good. All was good until I started to cap at about 5psi (wow).. I tried changing my boost gauge hose since it was reading the same measurement as my JAFROMOBILE made BLT. It has a gauge, and a shrader valve stem. Works fine, tested it with soapy water.
My AFPR was leaking at the setting nut, added a rubber o ring.. sealed right up. Found a vac leak @ the intake to AFPR.. Fixed.. Last little leak was at the MDP sensor which I've already changed to a SD set up, so this gasket is good.. it was just the barb going to the 4 bar MAP sensor. All tested out great but only netted me 6psi. Ok, not the end of the world right?
WRONG.
I heard bubbling in my crank case so I bypassed the turbo and went straight to intake. Nothing, same crap. And anyone telling me its my TB shaft and biss screw, i recently rebuilt the TB with a 60mm 1g and also changed the gaskets. Ive been paranoid and spraying these parts the most with soapy water. My brake booster to intake hose was unplugged but I plugged it back in.. still only 6~psi. Ive luckily started a YT channel to help with DSMs and recorded HOW to do ALL of this. But now I'm stumped because its been a while now and I still havent figured it out. I have one more question.
I did a EGR delete with a block off. Im wondering if the RTV under the gasket is potentially leaking thru to the other port. The two holes to eachother. There are no bubbles on the outside so my block off gasket is good to the outside, but im wondering if that could be it. I hear no hissing and its driving me insane, Ive checked behind the intake like i've read most people who have this problem have figured but i sprayed and felt and NOTHING. Injector seals are good... Valve cover leaks a bit from the breather and the dipstick leaks a bit when BLT the intake and the turbo. But the leak down found me no leaks.. no audible leak at all on intake exhaust or dipstick. Also filled up on coolant and checked the radiator for bubbles.
EDIT: (DURING BLT)The only air I can feel being lost is coming from the breather hose from the valve cover(the hose routed to the Turbo intake, & the dipstick. BUT I HAVE BEEN TRYING TO FIND WHY IT WONT LEAK EVEN WHEN ITS @ TDC, 30* or even 40*!!!
WHAT IS GOING ON!! ..
Please dont get mad and say to search, I've done searching and found nothing but dead links and unresolved posts. Its pretty annoying actually. Someone should clean those posts so no one has to read the million posts to no resolution.
Regards, Yeshua.
1995 GST
95' 7 bolt
OEM internals & head
Bolt ons:
PTE 5031 on WG pressure (no boost controller atm)
FP manifold
1000 cc injectors
VRSF front mount
o2 w dump
60mm 1g TB rebuilt w TB shaft seals & biss screw
EGR delete
3" exhaust
ECU:
SD setup
MAF delete
DSMLINK v3 lite
no other mods I can think of that would affect the BLT.
I went in this sequence to get where I am at.
BLT(NOGOOD)-> COMPRESSION TEST(170's) -> LEAK DOWN(NO HISSING)
Leak down was done with PCV vacuum capped.. as well as valve cover.
Leak down test, @ 90psi through a compression tester hose (my harbor freight tester only testw15psi)
What I did was take a pvc pipe and listened inside the TB elbow, stuck my ear by the exhaust.. & felt w a wet finger on the dipstick tube. All cylinders were checked @ TDC.
-intake no hissing,
-exhaust no hissing
-dipstick not even a little bit (thank GOD)
The compression numbers were impressive to say the least
170 across the board (all performed dry..)
& this engine supposedly had 145k & also was supposedly a 98' style block (BS cause the cam gears etc)
Boost leak test:
was the weirdest test EVER.
I've done BLT on my cars before. Easy process.. I've never had to find TDC @ *30 PTDC. So what I did AT FIRST was.. Just attach the BLT to the turbo.. waited and listened.. Found several boost leaks mostly were the couplers. SO i cranked those down good. All was good until I started to cap at about 5psi (wow).. I tried changing my boost gauge hose since it was reading the same measurement as my JAFROMOBILE made BLT. It has a gauge, and a shrader valve stem. Works fine, tested it with soapy water.
My AFPR was leaking at the setting nut, added a rubber o ring.. sealed right up. Found a vac leak @ the intake to AFPR.. Fixed.. Last little leak was at the MDP sensor which I've already changed to a SD set up, so this gasket is good.. it was just the barb going to the 4 bar MAP sensor. All tested out great but only netted me 6psi. Ok, not the end of the world right?
WRONG.
I heard bubbling in my crank case so I bypassed the turbo and went straight to intake. Nothing, same crap. And anyone telling me its my TB shaft and biss screw, i recently rebuilt the TB with a 60mm 1g and also changed the gaskets. Ive been paranoid and spraying these parts the most with soapy water. My brake booster to intake hose was unplugged but I plugged it back in.. still only 6~psi. Ive luckily started a YT channel to help with DSMs and recorded HOW to do ALL of this. But now I'm stumped because its been a while now and I still havent figured it out. I have one more question.
I did a EGR delete with a block off. Im wondering if the RTV under the gasket is potentially leaking thru to the other port. The two holes to eachother. There are no bubbles on the outside so my block off gasket is good to the outside, but im wondering if that could be it. I hear no hissing and its driving me insane, Ive checked behind the intake like i've read most people who have this problem have figured but i sprayed and felt and NOTHING. Injector seals are good... Valve cover leaks a bit from the breather and the dipstick leaks a bit when BLT the intake and the turbo. But the leak down found me no leaks.. no audible leak at all on intake exhaust or dipstick. Also filled up on coolant and checked the radiator for bubbles.
EDIT: (DURING BLT)The only air I can feel being lost is coming from the breather hose from the valve cover(the hose routed to the Turbo intake, & the dipstick. BUT I HAVE BEEN TRYING TO FIND WHY IT WONT LEAK EVEN WHEN ITS @ TDC, 30* or even 40*!!!
WHAT IS GOING ON!! ..
Please dont get mad and say to search, I've done searching and found nothing but dead links and unresolved posts. Its pretty annoying actually. Someone should clean those posts so no one has to read the million posts to no resolution.
Regards, Yeshua.
1995 GST
95' 7 bolt
OEM internals & head
Bolt ons:
PTE 5031 on WG pressure (no boost controller atm)
FP manifold
1000 cc injectors
VRSF front mount
o2 w dump
60mm 1g TB rebuilt w TB shaft seals & biss screw
EGR delete
3" exhaust
ECU:
SD setup
MAF delete
DSMLINK v3 lite
no other mods I can think of that would affect the BLT.
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