Back

 Help needed regards to 4G63 Motor etc  

Post Topic
Mrs_LJ_GSRRVR
  • Mrs_LJ_GSRRVR
  • 93 GSR
  • Contributing Member!
  • Member No.: 233
  • Joined: 4-October 02
  • Posts: 1,660
  • From: Bayside
Post #1 post 6th January 2003 - 01:35 PM
Okay ladies and gents heres the run down.



We have the 4G63 motor in our gsr car has been running fine had a

small oil leak so replaced the rocker cover gasket. Problem is now we

seem to have an air leak/boost leak or what sounds like one .



The car is running fine until it builds boost. The noise started

around 15psi and is slowly started to do it at lower pressure where

it is now letting go at 5psi. It build up to normal boost and drop

back down.



We have the intercooler piping pressure tested from the turbo to the

throttle body to 20psi and everything is fine in that department.



All hoses have been checked coming off the inlet manifold and seem to

be fine. We think it may be the inlet manifold gasket, any

ideas ????????????



Mrs_GSR and a very confused avalonea :roll:
TOP
blown13b
Post #2

ususally a vac leak will cause a rough idle. if it is doin this use a can of somthing very flamible eg carby clean. while running squirt into places of suspect and if there is a vac leak ie manifold gasket it will idle good while spraying it in that area!!!

Mrs_LJ_GSRRVR
Post #3

we have narrowed it down to the exhaust manifold will see how things go tomorrow once we pull it off~ :oops:

blown13b
Post #4

ohhh damm i know how that feels "harray for budism" you are eager i hate workin on my own car ay and i am a mechanic pfft

blown13b
Post #5

ohhh how did ya mannage to stuff that puttin a new cover gasket on???

4G63JETT
Post #6

Funny you bring up this subject - because the EXACT problem you are describing to me sounds like what ive got/Had. Cept ive got a SOHC 4G63.

Is it like a massive air induction noise on boost - like wooooooooooooooooooooooooooooooooooshhh - kind like a spoolup noise - but a air induction noise? I still dont know what it is buts its gone away now and only does it when it hit round 9 odd PSI. It has no affect on performance - but it will be interesting to see what was wrong with urs - see, I just replaced my old cracked exhaust manifold - so maybe i forgot or something came loose off it. Please keep us posted about what the problem turned out to be. It asl omakes a funny whispy noise when its cold - No its not the cracked exhaust manifold sound - but its a wierd kind of wisp - goes away after a few mins when the cars warmed.

Mrs_LJ_GSRRVR
Post #7

Well dumper the oil and the coolant ready start on the exhaust manifold dave got under and had a look and the exhaust was hanging off from the dump so tolk a new nut and the car is pulling harder then ever .. 8)

  • Member Login

    If you have a BoostCruising account enter your user name and password into the yellow box.

    Alternatively, you can quickly login with Facebook.

    If you don't have an account create one below.

    Create Account
  • Forgotten your password?
  • Login with Facebook

    Login using your Facebook account!

2 User(s) are reading this topic (2 Guests and 0 Anonymous Users)
0 Members:
Loading...
x