GreekStallion 2 Posted September 17, 2016 Hi all, I've got a AU XR6 VCT which is running rough on ide and driving. I'm not the most mechanically minded, so i'll try explain the best I can. Cold idle, it is very rough, sometimes rough enough that you can feel it in the drivers seat. When it warms up, its a lot better. There is a sucking sound coming somewhere underneath the throttle body when I switch ignition off. But I cant be sure as it could be the throttle body itself. There also seems to be a sort of dripping sound when you sit in the car (sort of like a slow tap leak on a metal sink) Shifting into either Drive or Reverse, the engine runs rougher than Park or Netutral, especially at low speeds (<5kmh). While driving, it feel like the torque comes and goes in phases. If I raise the revs to ~1500, it will start poping every few seconds through the exhaust, and the popping will occur more often the more I push the motor. I am fairly certain there is a vacuum leak, but I havent yet managed to find it. I've used carby cleaner on the top of all the inlet pipes to try and test the gasket. I have also done an ECU fuel trim reset, which as far as I can tell, is only making it chug more fuel than usual. I have tested the resistances between leads through the common coil pack, and all seem to be normal. The car has had a full exhaust system done (inc extractors and hi-flow cat) a few days ago. Currently running 3 week old Mobil 98. Any assistance is greatly appreciated. Nick 1 Mixalis reacted to this Share this post Link to post Share on other sites
Demmo 295 Posted August 26, 2017 what was the outcome to problem as my xg is now doing similar so I have to start looking for ideas besides a box of matchers other suggestions welcomed Share this post Link to post Share on other sites
GreekStallion 2 Posted August 26, 2017 I completely forgot I posted this. It turns out that one of the leads and the coil pack had gone almost simultaneously. Share this post Link to post Share on other sites
