Recently a Diehard battery was installed into the vehicle. The car began to idle high. Also two weeks after new battery was installed the car would not start. The battery was replaced again. Another two weeks later after driving the car for approximately 30 minutes turned it off when I reached my destination. About 5 minutes later I attempted to start the car and it would not start. However, about 35 minutes later it started. I took it to be serviced but they could not determine what might be the problem since they were able to start it each time they attempted to. They also did a diagnostic test but it did not reveal any problems. By the way they also adjusted the idle. You assistance and consideration will be appreciate. Thank you
Car not starting sometime. on 1996 Saturn SC2
by taffy in Country Club Hills, IL on March 05, 2011
ANSWER by patrick mannion , March 05, 2011
I would check that all connections are clean tight and secure at the battery, starter and engine ground. It could be a bad or unsecured battery ground cable between the battery and chassis or chassis and engine. Turn on the ignition switch to the on but not run position do you see an icon on the instrument panel representing a battery, if you do not see this battery icon the alternator is not seeing power to allow it to charge. Start the engine does the battery icon go out. A more complex but good diagnostic test is checking "voltage drop" on the battery ground and power cables. You can find a video on how to do a voltage drop test on youtube. Put a volt meter across the battery terminals with the engine off, at rest the battery voltage should be 12.6 volts if the battery is fully charged. Now get a friend to start the car while you watch the voltmeter, the voltage reading across the battery should read approximately 14.6 volts if the alternator is charging correctly. If the alternator appears to charge correctly, you say the "engine won't start" does it crank over? If so the starter is probably OK, and you would then need to determine if you are getting fuel and spark. If the engine doesn't crank over the starter or electrical circuit to the starter may have a problem (bad or open connection).