Car turns over but will not start
Check and make sure that the engine is getting fuel, spark and has compression........ Check all fuses.......... If there is no fuel coming from injectors but there is a injector signal, fuel pump or fuel pump electrical circuit could be bad. If the fuel pump in the tank is starting to go bad, some times but not all the time, if you get a rubber mallet and have someone crank the car as you bang on the gas tank with the rubber mallet, the engine should start. This is only a temp. fix. Depending on what vehicle you have, a faulty fuel pump can be accessed from under rear seat, trunk or the tank has to be physically removed from the vehicle in order to service the fuel pump. If the engine has no spark, again, check all fuses.......... Most of the time for a no spark issue, a crank sensor goes bad or the ohm values are out of specs. To ensure that you have a faulty crank sensor, you can either rent or buy a fairly inexpensive scan tool to check for trouble codes and possibly look at live data the the RPM signal. If you crank the engine and the scan tool does not pick up an RPM signal, more than likely, you have a bad crank angle sensor. If the engine has no compression, if the engine has a timing belt....... check and make sure that the belt has not broke, skip a couple of teeth due to bad tensioner or teeth stripped out at the crank due to oil contamination. If your engine has a timing chain, check to see if chain is stretched, broken or skipped couple of teeth due to bad hydraulic tensioner. Hope this helps..........