Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Hello and thank you for your question,One common cause for the backfiring and stall no start on your Titan can be caused by a failing Crankshaft position sensor and it will not always set a fault code. In most cases when the sensor fails you will loose spark as well as injector pulse. Start with making sure the connection to it is clean and tight and if so, consider replacing it.
I would take look at the Crankshaft position sensor signal when the problem is occurring. I suspect you may have a defective sensor and As I mentioned, it will not always set a fault code right away.
Backfiring in most all cases is caused by a timing concern providing the fuel pressure is holding steady as stated.