unstable idle on vs v8

[domtas]

hi guys,

ive got this unstable idle that i cant get rid off..

i have replaced the following
ignition module
tps
iac valve
clean throttle body
clean up the earth wirings

any ideas out there i should try to get this idle much better or am i dreaming off getting a nice idle on a vs v8 due to the age of the car

im thinking next is to change the following
temp sensor as it seems to be worst at first start like big up and downs.
spark plugs and leads , dist cap and rotor button?
after this im out of ideas, am i wasting money trying the above?
oxygen sensor will this help?

maybe a greenfoam tune will fix it up or previous owner has done a cam change and i cant tell coz im new to commodores.

any ideas plz....

[hq-racing]

my first option would of been new plugs and leads.. why ya there ya can do cap n rotor..
my bet that should fix it...

[domtas]

my first option would of been new plugs and leads.. why ya there ya can do cap n rotor..
my bet that should fix it...

ok i try plugs an leads next.

what plugs should i be getting..standard one or platnuim one.
also with leads should i be going the 9mm or 10mm leads or 8mm leads are good enough?

[VrWagz1]

Also at check for fuel leaks, espicially where it comes onto the rail. I had this once and it caused a bad hunt around idle

[varly]

has it got a aftermaket chip

[dirt drifter]

vacuum leak maybe?

[domtas]

has it got a aftermaket chip

not that i know of.

[domtas]

vacuum leak maybe?

how do i go about checking if its a vaccum leak?
anyone have diagram of the vaccum lines on vs v8 manual?

[VPbomb]

You checked for error codes?

[domtas]

You checked for error codes?

yer no errors came up

[hq-racing]

my 5.0 got a ruff idle at the mo after changing plugs n leads but only when its warm..
let me know if ya sus it..

[domtas]

my 5.0 got a ruff idle at the mo after changing plugs n leads but only when its warm..
let me know if ya sus it..

did u use the same plugs when u change over or u change to colder or hotter plugs..

[mike49]

you couldnt get a video up of it idling could you?

sure its not just got a big cam in it?

[hq-racing]

did u use the same plugs when u change over or u change to colder or hotter plugs..

they where are ngk plugs unsure of type, the i only recently bought the car, when i relised it was running all different types of pugs and leads..
thought i was doing it good.. it is a vt 5.0, but it didnt do it b4 the change..

[domtas]

you couldnt get a video up of it idling could you?

sure its not just got a big cam in it?

thats a good idea i get video up of the idle by tomorrow

[domtas]

they where are ngk plugs unsure of type, the i only recently bought the car, when i relised it was running all different types of pugs and leads..
thought i was doing it good.. it is a vt 5.0, but it didnt do it b4 the change..

yer just make sure it is the correct plugs in there, and the gap is correct.

[domtas]

thats a good idea i get video up of the idle by tomorrow

i have upload a video of the revs going up and down

[VrWagz1]

somthins up with that. Id keep goin with your little list of things to do. To me it sounds like the spark is drying a bit, so i would start plugs and dizzy and coil if ya think it will help.

[ParkwayDrv]

Mine used to do pretty much what your's does in that video, even while driving :S. I replaced the dizzy cap, rotor, plugs and leads and it got rid of the problem completely.

[hq-racing]

yea thats werid, mine only flickers, its real bad when driving tho.. revs are all over the place..

[domtas]

yea thats werid, mine only flickers, its real bad when driving tho.. revs are all over the place..

yer i have to try plugs, leads and dist cap and rotor button this weekend and see hwo it goes.

[hq-racing]

yer just make sure it is the correct plugs in there, and the gap is correct.

the plugs are NGK BPR6EF n the gaps are 25tho, no cracks on them. all at 25...
ahh this is starting to annoy me, it real struggles to go thro the revs, real hesitante..
ne ideas??

[domtas]

the plugs are NGK BPR6EF n the gaps are 25tho, no cracks on them. all at 25...
ahh this is starting to annoy me, it real struggles to go thro the revs, real hesitante..
ne ideas??

isnt 25thou about .60mm
i found a post by someone saying this is what plugs used and gapping

VS V8 5.0L
Std: BPR6EF gap: 1.0mm
Irid: BPR6EFIX-10 gap: 1.0mm

[hq-racing]

yeah gaps are too small, gonna try that n see what happens..

[Brett_jjj]

I have a haynes VN - VS V6 and V8 workshop manual,It says the plug gap for the VN-VP V8=0.95 - 1.05 mm. And the VR-VS V8=0.8 - 0.9 mm.