Postby smj999smj » Fri Apr 28, 2017 6:41 am
You need to learn how to test things and diagnose problems before replacing a part; that practice can lead to a lot of cost over time. There are a couple of things I would check. First thing I would do is a fuel pressure test and fuel pressure leakdown test; you will need a fuel pressure gauge in order to do this. The fuel pressure test will make sure the fuel pressure is within specs and, more important in your case, is not excessive. The fuel pressure leakdown test will let you know if one or more of the fuel injectors are leaking down when not running. If this is something that happens consistently, you can install a timing light to see if it senses ignition spark during your initial start. Lack of spark during startup can be caused by a couple of things, but I would highly suspect a faulty distributor. Smell the fuel and make sure it is not contaminated with gas. Perform a compression test and make sure it is within manufacturer specs. Check for stored trouble codes. You probably already replaced it, but, if not, make sure the air filter is not clogged. Also, make sure there are no intake leaks, including at the intake manifold gasket. Check the engine coolant temp sensor operation. Check the IACV-AAC valve and make sure it is operating properly. If you have done so, already, download or obtain a factory service manual for your vehicle; the engine control section would be of most help. NissanHelp.com has downloadable chapters in their "knowledge base" section and Nicoclub.com has free, downloadable service manuals. You can also sometimes find the paper version on Ebay.