Hard to start any time of the day for 1994 Nissan Quest XE.
I was told the fuel pump is electric, so after inserting the ignition key I have to wait for awhile before starting and it crank but don't start then I have to pump the gas 4 or 5 times then sometime it will start. When It starts everything is running fine very smooth like brand new. Spark plug, spark plug wire are less than a year old, rotor are only few months old. One fuel injector was change due to malfunction, add fuel injector cleaner every full tank (it start easy when tank is full) and it fuel is less than half tank, the problem of hard starting begins. Did researched and it points to the fuel pressure regulator, fuel pump but not sure which one is to change. Otherwise the van is running like a champ. Please help me identify why it is hard to start.
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Re: Hard to start any time of the day for 1994 Nissan...
Turn your key on, DO NOT TOUCH THE GAS PEDAL and start, good luck. Pumping the pedal doesn't do a thing for fuel injection. In thre days of carburetors and you had control of your own property, Pumping did a couple of things. It set the choke and added more fuel. But that was yesterday and yesterday's gone.
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could be a problem with engine electrical or still with fuel delivery. unhook a fuel injector line while it cranks and see if it shoots out spurts gas, just as the fuel pump line is supposed to shoot out a stream of gas while cranking. if you replaced the fuel pump, and no gas shoots out the disconnected fuel pump line, there is an electrical problem, (fuse, relay or wiring issue) to your new fuel pump. if the gas spurts out the loose injector line, then move on to electrical:
first ensure your ignition coil has spark by disconnecting the coil ouput lead and shorting it out to the chassis of the car. you should see a spark, when you short that circuit while cranking. if you have spark, you will have to move on to the spark plugs/ cables, then the distributor cap/coil packs.
if its part of the electrical system, it will be sensitive to temperature/humidity, and that may be why it only fails to start early in the morning. if it were the fuel injector, it would be more likely to start cold, and NOT re-start after it had already been warmed up and cut off recently.
The fuel pump only turns on for 2sec when key is turned on for a fuel pump prime. The fuel pump will turn back on during engine cranking. The most likely cause of stalling on this particular vehicle is a weak/bad crank sensor.
Your fuel pump is located inside the gas tank and every time you turn on the ignition switch the fuel pump will start and pressurize the fuel line for a regular starting cycle. But, since your fuel lines are totally empty. I would turn on the ignition for a 20 second period. then turn it off for a few minutes to let the system fuel system reset and then turn the key back on for the same amount of time and do this for at least 4 times. Each time you turn on the key if you have waited long enough to allow the fuel system to reset. This will in the end fill the fuel lines and fuel rail on the engine and then you should be able to crank the engine and start ok. do not crank the engine until after you have cycled the ignition key about four times and wait about 2 minutes in-between cycles.
Have a nice day, regards, Dennis
If there is no pressure at the fuel injection manifold, it indicates that the fuel pump is not being activated when you turn the ignition switch to start. This condition may be caused by a blown fuse, a bad ignition switch or wiring to the fuel pump, or a failed fuel pump. Check the fuse, then check the fuel pump by disconnecting the electrical connection at the fuel pump and applying a 12V battery source to the fuel pump. If the pump works, check the ignition switch and the wiring.
If the car will not crank then you have a battery, cable or starter issue. If the car will crank but not start then the problem may be the fuel pump relay. There should be an electrical diagram on the side of the relay. Apply 12v to either side of the coil and you should here a click. Then check for continuity between the other two terminals with voltage applied. If you have no continuity then the relay is bad.
PLACE THE PROGRAMMED KEY IN THE IGNITION SWITCH. FOR THE FIRST KEY. TURN IGNITION SWITCH ON AND WAIT 3 SECONDS RETURN TO OFF POSITION AND REMOVE KEY. FIRST AND SECOND PROGRAMMED KEY OPERATIONS MUST BE PERFORMED WITH IN 15 SECONDS. INSERT SECOND PROGRAMMED KEY AND SWITCH IGNITION ON. WAIT APPROXIMATELY 10 SECONDS. ENSURE IMMOBILIZER WARNING LAMP BEGINS TO FLASH AND AN ACOUSTIC SIGNAL IS EMITTED.SWITCH IGNITION OFF AND REMOVE KEY.WITHIN 50 SECONDS INSERT NEW KEY AND SWITCH IGNITION ON.WAIT APPROXIMATELY 10 SECONDS.ENSURE ACOUSTIC SIGNAL IS EMITTED AND IMMOBILIZER WARNING LAMP REMAINS ILLUMINATED FOR 3 SECONDS INDICATING PROGRAMMING COMPLETE. FOR EACH ADDITIONAL KEY REPEAT PROCEDURE STARTING FROM THE BEGINNING.REPLACEMENT KEYS CAN ALSO BE REPROGRAMMRF USING DIAGNOSTIC EQUIPMENT.MAXIMUM 8 KEYS CAN BE REPROGRAMMED.
check fuses inside truck . If any dought change it cause sometimes they are hard to tell. I have a 1986 nissan hardbody 4x4 myself.Buy yourself a haines manuel cause the fuel system is pretty weird . good luck i stop by and check out the nissan questions everyday,almost.