If your 1997 Nissan Altima is turning over but will not start properly, there could be a variety of problems. Some issues can be fixed on a short-term basis without any special tools. Other problems, such as changing and replacing spark plugs, require certain tools.
Listen to your Altima when you try to crank the engine. If you hear metallic, grinding noises, then your starter is not properly engaging with the flywheel and it will need to be replaced. If you have a narrow, blunt object, such as a hammer or tire iron, you can tap the end of the starter to get it to re-engage with the flywheel for one or two more starts. The starter for the 1997 Altima is located underneath the air-intake assembly. However, you should be able to see it from the top of the engine. Trace the positive battery cable to the starter, which looks like two small cylindrical pieces joined together.
Remove one of the spark plug wires and pull out a spark plug with a spark plug puller if your engine is firing but not igniting and continuing the combustion process. Inspect the spark plug's appearance. If the electrode on the spark plug is discolored or broken, then you most likely need to replace your spark plugs, which should all be done at the same time. Certain discolorations, such as carbon buildup or ash buildup may also indicate bigger problems, such as lower ignition system voltage or poor cylinder compression. Use a chart, such as the one on GNT Type website, to help diagnose spark plug conditions.
Jump your Altima if it is making prolonged and strained turnover sounds, but lacks the power to complete the turnover of a normal startup. Park another car next to your Altima and connect the positive jumper cable to the working car's positive battery terminal and then to the Altima. Repeat the same process with the negative jumper cable, except connect the one leading to your Altima to an unpainted part of the steel frame. Turn on your Altima.
Check your OBD II computer by using an OBD II scanner. This can help to pick up problems such as sensors or improper compression. If your Altima starts and then stalls out, there could be a variety of problems (such as timing or compression) that are preventing it from working properly. Turn on your OBD II scanner and turn on your ignition to the accessories position. You may need to look up your code (depending on your scanner) by using resources such as the OBD Codes website.
