1993 honda prelude vtec auto electrical problem. Sometimes doesn't start sports light flashes on dash?
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don't quite understand what you are asking as a flashing S light is typically not connected to a no start. the S light flashing means that the automatic transmission control has detected a problem in the control system sensors or outputs. It usually indicates a bad vehicle speed sensor but can mean other things. Did you notice what gear is indicated when you have the light flashing and the no start? I'm thinking that the range switch that tells the control unit what gear you are in isn't working correctly. what happens when it doesn't start? does it not crank? do you have no response to turning the key or does the engine turn over and not fire? the no start could be caused by a bad transmission range switch. try starting the car in Neutral instead of in Park the next time it happens. if the car starts in Neutral the range switch or the adjustment of the switch is your most likely cause. if there is no response to turning the key you could have a battery issue or a starter issue in addition to the transmission problem that is causing the S light to come on. Everything in the trans control system that is related to starting can be working right so that you get power to the starter but if the starter is defective (high resistance) it won't start. same with a low battery that doesn't have the current to turn the starter. check the connections on the starter and the battery. if you have a voltmeter you could check for power to the starter when the car doesn't start and that would tell you if you have a problem with the trans side or the starter side. i think you have two separate problems. unfortunately there's not enough information to give you any more to go on hope that helps
