Why do i hear a metal sound before it stallsYour symptoms are normally associated with a bad crank sensor rather than a bad cam sensor, they are two distinct sensors. Crank sensor monitors rpm of the crank while the cam sensor monitors the rpm of the overhead cam shaft. A going bad crank sensor will work intermittantly but you need to change it out for a new one for reliability & safety. Easy check for a good signal on startup is look at the rpm dial & see if its climbing....if it is then your signal is good but of course you may loose the signal while driving. It happened me on a busy French road. :-(
A metallic sound could just be the engine/gearbox running at very low RPM - especially if still in gear and trying to move the car (engine and gearbox/transmission 'Backlash' can be sharp and loud).Why do i hear a metal sound before it stalls