As above, most of the manufacturers diag's have a compression test setting that opens the throttle body and disables the spark. I did daughters 207 last week looking for why its lambda was too high for the test the other week and its in diagbox as a test mode under engine ecu. Two new o2 sensors and a sneaky fill up with e85 40km before the test before it got chance to relearn the resulting weak mixture got it in range... just... It probably was too high at manufacture since bmw said 1L oil per 1000km was a acceptable oil consumption. It has 2 years clean french mot on it now anyway, not in bad nick for a 2007 1.4 prince engine with 185,000km on it.
We tested lads astra H 1.6 petrol ecotec the same for a different problem, only because I didnt have the laptop with opcom on to hand, I pulled the feed to the coil pack and throttle body and just put something soft in to hold the blade open, and give me valid comparative readings on cylinder pressure. I bet that one has issues with its swirl flap mechanism wore out, except they cant be rebuilt with a kit so its going to involve some machine work in the shed.
We tested lads astra H 1.6 petrol ecotec the same for a different problem, only because I didnt have the laptop with opcom on to hand, I pulled the feed to the coil pack and throttle body and just put something soft in to hold the blade open, and give me valid comparative readings on cylinder pressure. I bet that one has issues with its swirl flap mechanism wore out, except they cant be rebuilt with a kit so its going to involve some machine work in the shed.
