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

Can anyone tell me the correct fuel pressure for a VY V6?

mag

Member
Joined
Jun 23, 2005
Messages
869
Reaction score
12
Points
18
Age
58
Location
South OZ Adelaide
Members Ride
VY Series 1 Acclaim 2003
I have a pdf workshop manual that lists 2 lots of fuel pressures in different sections.
Pics attached..
Fuel pressure 2020-03-11 154236.png
InkedFuel pump presure 2020-03-10 211654_LI.jpg
 

immortality

Can't live without smoky bacon!
Staff member
Joined
Apr 15, 2006
Messages
17,896
Reaction score
6,981
Points
113
Location
Sth Auck, NZ
Members Ride
HSV VS Senator, VX s2 Calais S/C
The V6 should be rated at 3.5 bar/51 psi but that is without a vacuum source connected to the FPR. At idle with vacuum connected it will read less.
 

mag

Member
Joined
Jun 23, 2005
Messages
869
Reaction score
12
Points
18
Age
58
Location
South OZ Adelaide
Members Ride
VY Series 1 Acclaim 2003
The V6 should be rated at 3.5 bar/51 psi but that is without a vacuum source connected to the FPR. At idle with vacuum connected it will read less.
Thanks for that ;)

Well that seems what I have, ignition on it's 42 psi/2.9 bar and running it's just a tad under that and with the vac line removed it's 50 psi/ 3.4 bar hmmm.

Maybe I have injector problems then? Still have lean mid range going up hills and with the PC plugged in the usual AFR 14.7 goes up to 16.3 and the knock senors start retarding the spark timing..
 
Last edited:

immortality

Can't live without smoky bacon!
Staff member
Joined
Apr 15, 2006
Messages
17,896
Reaction score
6,981
Points
113
Location
Sth Auck, NZ
Members Ride
HSV VS Senator, VX s2 Calais S/C
That's what you want. I see no problem there.
 

07GTS

Well-Known Member
Joined
Sep 8, 2013
Messages
2,710
Reaction score
1,164
Points
113
Location
Australia
Members Ride
VEGTS BLOWN E85
and the fuel trims arnt correcting for it or does it go OL ?
 

mag

Member
Joined
Jun 23, 2005
Messages
869
Reaction score
12
Points
18
Age
58
Location
South OZ Adelaide
Members Ride
VY Series 1 Acclaim 2003
Thank you also for the reply, I can't quite remember so I will view the data again.
I do remember the both 02 senors going very lean at the same time!
 

immortality

Can't live without smoky bacon!
Staff member
Joined
Apr 15, 2006
Messages
17,896
Reaction score
6,981
Points
113
Location
Sth Auck, NZ
Members Ride
HSV VS Senator, VX s2 Calais S/C
Fuel pressure and fuel flow are 2 different things. Pressure may be fine at idle but drop under load if there isn't enough flow.

I'd clean the MAF and probably change the fuel filter for starters.
 

mag

Member
Joined
Jun 23, 2005
Messages
869
Reaction score
12
Points
18
Age
58
Location
South OZ Adelaide
Members Ride
VY Series 1 Acclaim 2003
Fuel pressure and fuel flow are 2 different things. Pressure may be fine at idle but drop under load if there isn't enough flow.

I'd clean the MAF and probably change the fuel filter for starters.
I have cleaned the MAF and changed the fuel filter and changed plugs - checked Omhs reading on the leads, also cleaned the throttle body..
 

mag

Member
Joined
Jun 23, 2005
Messages
869
Reaction score
12
Points
18
Age
58
Location
South OZ Adelaide
Members Ride
VY Series 1 Acclaim 2003
and the fuel trims arnt correcting for it or does it go OL ?
Just been looking at the data and I'll throw it up here for you to see..
AED lean .png
 
Top