running real ruff plz help!!!

[quick six]

hi guys, i have a vs, v6 ute, a while she was running real ruff slatters on throttle idling ruff just didnt wont to go so i bought all new fuel fillter, fuel pump, leads, and ran some injector cleaner through it ...then it came down to replacing coils and dfi,, then she ran perfect, just the other day i had a little accident with my extractors, i have just got my car back from putting new ones on and now it doing it all over again and im outta ideas... i also have been running bp ultimate THE GOOD FUEL so i just dnt no plz help!!!!!!!!

[PanthaVS]

have you checked for error codes?

youve changed your extractors... did you damage the oxy sensors?

[quick six]

i havnt done error check. how do i go buy doing that.. and wouldnt the exhurst ppl be able to tell if oxy sensor are stuffed...mayby i should go back and see them
..

[PRAVX II S]

i havnt done error check. how do i go buy doing that.. and wouldnt the exhurst ppl be able to tell if oxy sensor are stuffed...mayby i should go back and see them
..

You have to test the o2 sensor on a graph or multimeter. If the job was installing extractors then thats all they will do.
The o2 sensor just screws in and the electrical connector just plugs in.
Might be a leak in the exhaust manifold/extractors they installed.
Check for vacuum leaks
Check if the intake duct has no leaks.
Check the maf sensor.

[quick six]

wat is a maf sensor... and wats best way to cheack for vac leaks

[PRAVX II S]

wat is a maf sensor... and wats best way to cheack for vac leaks

Look at the picture the vacuum lines are behind the inlet manifold and MAF sensor is obvious.

[quick six]

aww sweet.. es i will be cheacking that thanks heaps mate... wat do u say bout the o2 sensors should i take it back and get them cheacked...

[PRAVX II S]

Well first of check for codes before you go any where.
bridge pins 5&6 on the diagnostic connector and see what you get.
There is a right up on this some where on the forum have a search.
Also you can use a multi meter to test the o2 sensor,but the best way to test it is on a graph.
I dont think the o2 sensor is your problem. Because the o2 sensor only works when its heated up to its operated temp.
Does your car idle rough straight away from cold start?

[quick six]

yes but not as bad as when it warms up a bit
thats where it starts to miss, but sometimes ony slightly

[VS_Pete_1]

Here mate
Great writeup and it has pics.
Good luck.
Checking error codes VR/VS (Revised)

And here is what they mean.
http://www.justcommodores.com.au/art...omputer_v6.php

[quick six]

ok i have done error checks and it showed 12 system pass, any other ideas haha

[holden300kw]

check for good compression. Make sure all tour leads and injectors etc are plugged in securely. if all ok maybe a fuel flow test, but only if there are no inlet / exhaust leaks. inlet leaks can be found by spraying round with engine start while idling, if there is a leak the engine will pick up a little as it sucks some in.

[quick six]

thanks heaps guys.... it turned out to be the spark plags.. 2 of the plugs were cracked on drivers side, must of been inpacked when i damaged extractors..... she runing brand new.......