The car is a series 2 VY Maloo. With the LS1.
On the way to work today after about 1 hours driving on the highway I dropped a gear to pass a truck merging onto the next lane. When I got past the truck I noticed the engine making a funny noise and having a lack of power. Sounded like really lumpy engine. When I got to the traffic lights it almost stalled and idol really badly, when taking off again it sounded worse, lacked power, jerky and spluttery.
I drove it to work and parked it for the day. This afternoon I came back to it. Started it, seamed ok... then it started again. Spluttering and shaking. I do sometimes get an engine warning light in the dash every few days/weeks but for some reason it never registers in the computer and when I put it in diagnostics mode, no codes show up.
First thing I thought was plugs and/or leads. Which it needed regardless, so I bought a new set of decent leads and top of the range NGK plugs. Installed them ok, started it back up ran fine then it started doing it again.
Only other thing I can think of is O2 sensor, even though it's not telling me that in the diagnostics...
The ute is back at work and I'm going there tomorrow to spend some more time working on it. I'll be buying a couple of O2 sensors anyway and putting them in as well as a new fuel filter. But if they don't fix it I'm at a dead end of my knowledge.
I'm definitively no mechanic but If I know what a problem is I'm more than capable of fixing it myself if it's not too complicated. Though if it's fairly serious I take it to a mechanic. Usually only internal stuff.
It would be good to go there tomorrow with a bit more knowledge especially from people who may have come across the same issue before. So I can do an elimination process to scout out the issue. But I think because it runs perfect when cold and **** when it reaches operating temperature narrows it down quite a bit.
If someone could dot point a few problems that might cause it and a way to check if it is that problem and even better how to fix it that'd be great.
To help out I've taken a couple of videos.
Thanks, Toby. http://youtu.be/gLeA5bOafxw