Corsa-B.uk - Vauxhall, Opel and Holden Corsa B Owners Club

Hello, I have a 1.0 Corsa Envoy 1999. The car was fine when I bought it and not long after (less than 2K) the dreaded engine management light came on. When I start it up it revs like mad then settles down a little but still idles to high. I have changed the idle control valve, throttle position sensor and a whole new throttle body. The error code I am getting is P0505. For now I have unplugged the idle and set it manually using a 9V battery so that it idles correctly. I have checked the air mass meter and it appears to be clean and I am not getting an error code for it. I also disconnected the battery over night to let the ECU reset but still no joy. I have also replaced all the air box trunking and the air filter.

For some reason when I turn the key the car tries to push the idle valve fully open which causes the revs to go through the roof before dropping into engine management mode. Has anybody any idea why the ECU is doing this? I am assuming that it thinks the car needs more air to get through but then realises that the revs are too high and errors. Is this a faulty ECU? As far as I can tell there are no split pipes but I haven't been able to check underneath the car for any exhaust problems. Could my oxygen sensor be bust? I'm not getting any error codes for it and if I measure it I get alternating between lean / rich on idle.

Alan

never fear i have the solution............GET A REALLY BIG HAMMER AND JUST SMASH THE f**k OUT OF IT!!!!!!

Cheers matty, although I'm thinking of "car darts" like they did in Top Gear or possibly a large wrecking ball. I suppose I can live with it as it is not too bad now I have pulled the plug. My only concern is the engine management light is on - will this fail an MOT?

Alan

will this fail an MOT?

I believe so.

the revs were all over the place on my mates 1.0 12v. i replaced the crank sensor and it seems to have settled down a bit. the main reason to replace the sensor was that it wouldnt start off the key so had to be push started and would cut out and not restart after about 15 mins