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For some time, I've had a problem with the performance of my Ford Focus 1.6 TDCi (Diesel): when accelerating hard in the 3rd or 4th gear, there was a performance drop and I sometimes had to go off the gas pedal for gas to be registered at all again. The drop was much more severe than a turbo lag.

The strange thing is that after the temperature dropped one night by about 10°C (and has stayed at that level), the problem does no longer exist. I'm completely at a loss as to what could have been the problem. (The lambda sensor should not be sensitive to 10°C changes in ambient temperature, and I don't know what else would be.)

pmf
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1 Answers1

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Whilst technically a car has more power in colder air because the relative density of colder air is greater and therefore contains more oxygen than warm air, it should not cause the behavior you describe.

It sounds to me like one of the sensors your ECU uses is faulty. My first port of call would be to have a diagnostic scan done which will pinpoint any faults that car has registered and go from there.

Steve Matthews
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