My 1996 Maxima with 115K miles has difficulty starting cold, requiring 3-5 seconds of cranking and several attempts. The car gets progressively harder to start as the gas tank empties. New starter and knock sensor recently installed for unrelated issue.
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You probably should perform a fuel pressure test to see if the fuel pressure is bleeding off of the fuel rails when the engine is shut off. If it is, you could have a bad fuel pressure regulator or a bad check valve in the fuel pump module (which will require replacement of the module).
One way to test for this condition without any tools is like this: cycle the key ON, wait about two seconds, then OFF, wait about 2 more seconds, and back ON again. Repeat his 3 or 4 times before turning the key to the CRANK position. If the engine starts immediately every time you do this, then the hard starting is definately caused by the fuel pressure bleeding off.
Does it help if you cycle key on and off a couple of times first, and then try start ? (not to start, just to on position a couple of times.) If that helps, changing fuel filter may cure problem, otherwise, have fuel pressure tested, pump may be getting weak.
Based on what you described.
You have weeak ignition spark.The reason you have to wait for 1 hour to restart later to have all flooded fuel dried out so the sparks could ignite combustions.
1- Change all spark plugs.
2- Change air filter also
Have each spark plugs checked sparks when cranking to find out which one is really bad to replace the coil pack if applicable.
After these, if it still happens, then have the Cold start valve checked and replaced.
You don't need to go to a dealer. You can have any local shop to do this for you. Then you can control what you want them to do for you, not other way around for baloney recomendations from dealers. Good luck.
IF its not a fuel issue as in you checked your fuel pump, fuel filter, fuel injectors and pressure regulator, try having your timing belt looked at. Maybe its time to replace it. Check your crank and camshaft sensors as well.
try changing the fuel filter and turn the key on and off several times before starting engine. once running check the vaccum line on the fuel pressure regulator.the regulator can leak fuel from that connection.