Can't boost past 10psi...wastegate and vacuum lines ok!!
#18
Newbie
Thread Starter
Join Date: May 2007
Location: Orange county
Posts: 21
Likes: 0
Received 0 Likes
on
0 Posts
I read that the throttle body shaft seal can leak as well. One thing I failed to mention is that my gas pedal inside the care is extremely stiff now and has been for some time. Could the shaft seal be a reason for a stiff gas pedal and a potential boost leak????? lol i feel like om getting closer to a solution!
#19
Evolved Member
iTrader: (17)
hmm..i think it would b the opposite if the seals were torn up. loose not stiff. i changed out my seals the other day and it didnt help. but u might have a different situation. fix n c.a problem i just found was that my valve cover is cracked. when i do a leak test i can hear air coming out by one of the bolts around cylinder 3. whats up with that? i didnt kno that area gets pressurized also? is that normal?i know its cracked but didnt know that area fills up with air with the leak test.
Last edited by 05VIII; Apr 21, 2009 at 09:15 PM.
#20
Evolved Member
iTrader: (17)
i replaced my cracked valve cover with a new one. problem is still there. i have no clue what to check next. i did the leak test again n have no leaks so dont kno y it wont boost. the last 2 things it could b is the wastegate or the boost controller. ay jdeinert did you ever fix your problem?
#21
Evolved Member
iTrader: (12)
I read that the throttle body shaft seal can leak as well. One thing I failed to mention is that my gas pedal inside the care is extremely stiff now and has been for some time. Could the shaft seal be a reason for a stiff gas pedal and a potential boost leak????? lol i feel like om getting closer to a solution!
#22
Evolved Member
iTrader: (13)
We have an evo that we put the hallman mbc on. At first we were able to turn up the boost and it ran very well. After a day we started to have fuel cut off issues, and boost would drop dramatically after a few seconds of running consistently 21 lbs of boost. His boost pressure read 8psi and would not go past that. We did a boost leak test, checked all piping and intercooler couplings, checked all seals and gaskets. we checked is manifold for cracks, and couldnt find anything. no hissing or unusual noises either. We took the mbc off and revamped all of the vacuum lines, and the boost went back to normal with no issues. We were back to running stock boost. The problems with mbc is, and i do speak from experience is that you cant really just put one on and turn it up and go. You must tune your vehicle with the boost control settings from the mbc that you put into it. With no tune, you will only run into problems. I hope this helps out somewhat.
#23
Evolving Member
iTrader: (11)
Join Date: Sep 2006
Location: Cencal Bay
Posts: 368
Likes: 0
Received 0 Likes
on
0 Posts
Did you guys figure out problem? Am too having an issue with internal leak.. I can hear a leak at valvecover. I fixed all other external leaks, no more hissing. Just that gurgling sound from inside the motor. ):
#26
Newbie
Thread Starter
Join Date: May 2007
Location: Orange county
Posts: 21
Likes: 0
Received 0 Likes
on
0 Posts
nothin yet still figuring it out...I reset my ECU and the boost went back up to 8lbs for about an hour....im just gonna take it in to a shop...My baby has 80k on it and its only been boosting for forty of the 80....waste of talent
#28
Evolved Member
iTrader: (7)
i replaced my cracked valve cover with a new one. problem is still there. i have no clue what to check next. i did the leak test again n have no leaks so dont kno y it wont boost. the last 2 things it could b is the wastegate or the boost controller. ay jdeinert did you ever fix your problem?
#29
Evolving Member
iTrader: (15)
Join Date: Oct 2007
Location: Houston, TX
Posts: 422
Likes: 0
Received 0 Likes
on
0 Posts
when you boost check it did you take off your bumper and start from the turbo and spray the crap out EVERYTHING!! that boost travels through starting from the turbo outlet to the intake mani where it bolts to the head.
literally drench everything, where the bubbles are is where your leaks are.
i had the same problem after i swapped my tranny and i forgot to bolt an IC clamp down
literally drench everything, where the bubbles are is where your leaks are.
i had the same problem after i swapped my tranny and i forgot to bolt an IC clamp down
#30
Evolving Member
iTrader: (2)
Join Date: Sep 2005
Location: Charlottesville, VA
Posts: 278
Likes: 0
Received 0 Likes
on
0 Posts
Have you swapped your boost controller for a friends? I had this issue, did the leak test with soapy water and checked all of my clamps and whatnot, and it ended up being a bad boost controller. They just go bad sometimes...