Im guessing that the service engine light is comming on and off instead of staying on all of the time. these service lights come on for a long list of things. this is the time of year when we tend to use all of the power option in our cars. light wipers heater ect it is also this time of year that we find out how good our charging system is working and how good our batteries are. control voltage in most vehichles is between 12.5vdc and 14vdc check engine lights can come on when your control voltage falls below this given level. warning lights could be caused by a sticking thermistat. the difference in temperature from hot water in to cooler fluid out of the radiator should be roughly 6 degrees from top to bottom higher or lower ranges may cause this to light up the check engine light. and there are a host of other minor things that will make the light come on and off. washer fluid levels, brake fluid level being low but not fatal. a missfiring plug at a certain rpm due to carbon build up inside the distributor cap. alot of genaral maintinace type things create this onand off scenario.
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