Join Date: Feb 2001
Location: Bibra Lake Western Australia
Re: 2004 xr6 stock wont idle longer than 5/10 seconds
These car are renowned for vacuum leaks on the inlet manifold at number 1 and number 6 cylinders where the inlet manifold meets the head at the manifold runner's lowest point. The retaining nuts come loose and the bottom third of manifold gasket burns out so it stalls at idle. The leak is small and will usually change as the manifold heats up and the gap size changes. It is very difficult to find these leaks with the traditional methods of spraying oil, water, starting fluid, benzene gas etc around the manifold as it's at the lowest point of the runner (so anything you spray has to defeat gravity) and the leak is very small (so the ECU adjusts the mixture almost instantly and no change in engine speed as a result of the sprayed substance being sucked into the manifold will be noticed). The best way to check for and find these leaks is to get a metre or so of soft rubber or nylon windscreen washer sized hose and stick one end in your ear while moving the other end around the inlet manifold (especially underneath the runners at number one and six) while idling the engine and listening for the sound of an air leak. Someone may have assist by holding the accelerator very slightly down so it doesn't stall and you need to do this with both a hot and cold engine. You could also use a mechanic's stethoscope with the metal rod part removed so you have just the open tubes to listen through.