I believe that you would have an electric fuel pump that pressures up the system when you turn on the ignition. I always, well nearly always, wait until the noise stops and the immobiliser light stops flashing before starting the car.

My guess would be that you have had water down the spark plug holes and the porcelain of the sparkplugs is coated with a material that is conducting the HT electricity and weakening the spark whilst the engine is cold. Other than that there could be a world of possible causes: a faulty sensor would be the next best guess.

Peter

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