Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.

New Posts Contact us

Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

High pitch squeal in engine bay

ephect

Donating Member
Joined
Jul 27, 2006
Messages
5,051
Reaction score
2,801
Points
113
Location
Melbourne
Members Ride
VS Acclaim V6
ok so warmed her up, started squealing, unplug the purge solenoid and no change.

Unplugged a couple of injectors, besides running rough, no change

Unplugged iat and TPS, no change.

I'll run the belt off later this afternoon to check accessories. Changed the oil and at least the lifter tick has stopped.

Other ideas?
 

ephect

Donating Member
Joined
Jul 27, 2006
Messages
5,051
Reaction score
2,801
Points
113
Location
Melbourne
Members Ride
VS Acclaim V6
Video when turning off the engine
 

greenacc

Searching for the billion
Joined
Jul 13, 2008
Messages
5,758
Reaction score
1,221
Points
113
Location
Sydney
Members Ride
VE Berlina
Oh, this is an ecotec. The noise sounded like a vacuum leak. Check all the vacuum lines like the hose to the booster and the vacuum ball under the front guard. Brake boosters fail sometimes and the balls are only plastic.
 

ephect

Donating Member
Joined
Jul 27, 2006
Messages
5,051
Reaction score
2,801
Points
113
Location
Melbourne
Members Ride
VS Acclaim V6
Balls?

Brakes still work fine, no change in pedal
feel. I'll double check the hoses too, Cheers for that

would one assume vacuum if ok if I can pump the brakes a couple times before it gets hard?
 

grey_hawk

New Member
Joined
Jan 14, 2015
Messages
25
Reaction score
5
Points
3
Location
S.A
Members Ride
VR V6 Ute
I think the ball is a reservoir for climate control.
The brake vacuum is held by the brake booster.
 

ephect

Donating Member
Joined
Jul 27, 2006
Messages
5,051
Reaction score
2,801
Points
113
Location
Melbourne
Members Ride
VS Acclaim V6
Ahh the vacuum ball, sorry I thought you were indicating there was a plastic bag in the booster. I'll check it.

Grey_hawk, all VS models has them.
 

1985VK

Well-Known Member
Joined
Oct 5, 2018
Messages
489
Reaction score
630
Points
93
Location
Australia
Members Ride
VK SL
sounds like air
 

grey_hawk

New Member
Joined
Jan 14, 2015
Messages
25
Reaction score
5
Points
3
Location
S.A
Members Ride
VR V6 Ute
Could be either a pinhole or rubber hose that has hardened,perhaps trimming a bit off of the end of vacuum hoses might get a better seal.
 

ephect

Donating Member
Joined
Jul 27, 2006
Messages
5,051
Reaction score
2,801
Points
113
Location
Melbourne
Members Ride
VS Acclaim V6
I believe I've found it. I reached back behind the manifold and I believe the manifold halves are leaking. I could change the sound by covering where the halves meet.

Took the plenum cover off, quickly nipped up the bolts which were right anyway. Replaced cover and didn't have any effect.

Striped it down to split it and it has a metal type gasket which is warped, and has oil outside of the mating area.

My question is, do I need a gasket between the halves? Mine doesn't have the o-ring grooves
 

Dirbatua

AWOL!
Joined
Apr 6, 2003
Messages
3,866
Reaction score
74
Points
48
Age
33
Location
S/e Victoria
Members Ride
VX SS Manual, VU SS Auto
There's a metal gasket between the pieces of the intake manifold but the gasket between the heads and bottom half should be plastic.

I have put gasket maker between the halves before without issue and turfed the metal gasket as a temp fix that lasted longer then the car :p
 
Top