Crank turns over but car wont fire

  • 1994 NISSAN NX
  • 150,000 MILES
The car would not fire, changed plugs, removed and cleaned distributor cap and rotor, worked perfectly for 1 day. Next morning would not start. Replaced cap and rotor, no good. Changed fuses, no good. Plenty of spark from the coil - still wont fire
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Friday, September 13th, 2013 AT 7:49 PM

1 Reply

Changed the fuses? Most people just check them to see if one is blown. If you pulled out all of them one will have killed the memory circuit and you will have erased any diagnostic fault codes from the Engine Computer and that valuable information would have been lost, however, ... Most codes are related to loss of spark. The fuel supply system is not monitored, so there likely were no fault codes anyway.

If you have spark, that leaves valve timing, compression, and fuel to look at. If we go on the assumption this is all related to just one cause, and you had a no-start, then the engine ran before it developed another no-start, that leaves out fuses, compression, and valve timing because none of those will fail intermittently, then magically fix themselves later. By that logic that just leaves the fuel supply. Try spraying in a little starting fluid or carburetor cleaner, then crank the engine. If it runs for a few seconds you will have proof the valve timing and compression are okay. The next step would be to verify there's no fuel pressure. Some engines have a test port on the fuel rail on the engine; some do not. If there's no fuel pressure the logical suspect is the fuel pump, but some electrical checks should be done first to rule out other potential causes for the pump to be dead.
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Friday, September 13th, 2013 AT 11:49 PM

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