Quote:
Originally Posted by dcb
You know, I'm not convinced that open loop indicates complete fuel shutdown. I thought I saw on the metro (with the mpguino ) that the injectors were still firing even when in overrun at a fairly high speed. I think I need to do some more tests on that...
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No. If it's 'open loop' in the engine-computer sense, it indicates that the engine is running a fixed (usually slightly rich) mixture, rather than relying on oxygen sensors and such. The engine usually runs open loop during cold start, since the oxygen sensors need to warm up before they begin to work. It could be that the computer goes into open loop BECAUSE it's cutting off fuel, but 'open loop' by itself actually means that the engine is running slightly richer than it should.