Question about Cars & Trucks
I doubt anything is getting wet, but you could be right on a bad connection. You could have enough humidity in the air after a rain to cause a weak connection to fail completely. It could also be a faulty relay.
Someone would need to figure out if you are lacking spark to the plugs or fuel pressure when it fails to start, then track down why.
Posted on Jul 13, 2013
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Posted on Jan 02, 2017
SOURCE: AC blows warm air when it rains
It sounds as if you have an ambient temperature sensor that is either shorting out when it gets wet or either the water is acting like an insulator and sends an incorrect reading to the body control module. You may want to contact BMW to the specific location on your particular year and model. As location will vary with model and year.
Posted on Jul 02, 2009
Obviously water is the cause. Make sure all hood seals and underbody splash shields are in place, check firewall main connector for security. After it rains (without driving it in rain) check floor mats inside for water. A possible windshield or dash leak is allowing water into electrical area near instrument cluster (windshield may need resealed). Lift hood and look for water on any electrical connections disconnect dry, and seal with tune up grease from parts store.
Posted on Aug 24, 2011
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Check all your connections under the hood, and check to see where the water is penetrating, check especially the battery connects. Usually the cause of a no start in rain/high humidity conditions is that the spark voltage is arcing to the engine metal rather that to the spark plug because of worn out spark plug wire insulation. You may be able to observe this when the engine is running at night in a dark location when it is wet outside by opening the hood and observing for arcs jumping out from the spark plug wires. The distributor cap could also be cracked which can also short the voltage to ground. It is suggested to replace the spark plug wires and look carefully at the distributor cap for any signs of a crack.
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