Question about 1985 Nissan 300ZX

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My 1985 nissan 300zx stays running 45 seconds then shuts down,will start again but shuts down please help i miss my car!

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My 1985 nissan 300zx did the same thing i had to replace the fuel pump that did the job.

Posted on Feb 22, 2015

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No it won't stay running I spray starting fluid it will run until I stop spraying I check fuel pressure n its at 40psi I changed out the fuel regulator I check the injectors the are all working properly I do have injector pluse I changed all the plugs rotor n cap ,ignition con mod, wires,and fuel filter

Posted on Dec 22, 2014

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Hi, there are many reasons why your car would run for some seconds, less than 45 seconds, 45 seconds or more than 45 seconds and shut down, so i would let you know all the reasons and possible cause of the problem.....


An engine vacuum leak. Check for loose or broken vacuum hoses, leaks around the intake manifold gasket or throttle body, leaks around the PCV valve and EGR valve.


A dirty or defective airflow sensor. A sensor that has been contaminated by fuel varnish or dirt will under report airflow and be slow to react to changes in airflow. This can upset the air/fuel mixture causing idle, stalling and hesitation problems. Cleaning the airflow sensor wire with aerosol electronics cleaner can often restore normal operation and cure the problem.


A defective idle speed control system. Idle speed on a fuel injected engine is controlled by allowing a small amount of air to bypass the throttle. If the idle air bypass circuit is plugged with dirt or fuel varnish, or the solenoid valve is sticking or broken, the engine may not get enough air to idle normally causing it to stall. Cleaning the idle air bypass circuit in the throttle body with aerosol throttle cleaner will often remove the gunk and solve your stalling problem. If a good soaking with cleaner fails to fix the stalling problem, check the wiring connector. It might be loose or corroded. If no wiring faults are found, you may have to replace the idle speed control solenoid.


A faulty coolant sensor. If the coolant sensor is bad and tells the PCM the engine is colder or warmer than it really is, that can screw up the fuel mixture, too. If the coolant sensor reads colder than normal, or cold all the time, the engine will run rich. This won't cause cold stalling but it can make for a rough idle once the engine warms up, and it kills fuel economy. If the coolant sensor reads warmer than normal, or reads hot all the time, the PCM will lean out the fuel mixture too much, causing the engine to stall when it is cold. See the article on coolant sensors for how to test the sensor. Replacing a defective coolant sensor will cure this cause of stalling.


A faulty air temperature sensor. This sensor tells the PCM the temperature of the air entering the intake manifold. The PCM needs an accurate input so it can balance the air/fuel mixture properly. Just like a bad coolant sensor, a bad air temperature sensor can upset the fuel mixture causing stalling problems.


A bad Manifold Absolute Pressure (MAP) sensor. This sensor monitors intake vacuum, which the PCM uses to determine engine load. If the MAP sensor is not reading accurately, the PCM may add too much fuel or not enough, causing the engine to stall. See the article on MAP sensors for how to diagnose this sensor.


Low engine compression. If your engine has a lot of miles on it and compression is low because the piston rings and/or cylinders are worn, ot it has one or more leaky valves, it may not have enough oomph to keep idling. A compression check will tell you if this is a problem or not, and if it is there's no easy fix other than to overhaul or replace the engine.


Worn or fouled spark plugs. Ignition misfire can make any engine stall at idle. When the engine is running slowly, there is less momentum to keep it going, so a bad misfire may cause it to stall. If the spark plugs have not been changed in a long time, a new set of plugs and/or plug wires can restore a good hot spark and eliminate the misfire. A weak ignition coil or a faulty crankshaft position sensor may also cause a stalling problem.


Bad gas. Gasoline that contains too much alcohol (more than 10%), or gasoline that has been contaminated with water or some other substance may not burn well and cause your engine to stall. If the stalling started to occur shortly after your last fill-up, suspect bad gas. The cure is to drain the tank and refill it with fresh gas from another filling station, or just use up the bad fuel (if the engine runs okay at highway speeds), then refill at another station when the tank is near empty.

Posted on Apr 04, 2011

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There are only a few things that could cause this to happen, you either have a bad distributor, badn cam sensor, crankshaft sensor, O2 sensor, or MAF-mass air flow sensor. You can cycle the key on and off and the check engine light and PCM will flash out codes, this is the easiest way to diagose the issue, and will save you a lot of time and money. I would recommend that you disconnect and reconnect all of the connections to the above sensors as this can happen from poor connectivity. If you rev your engine will it stay running?

Posted on Apr 04, 2011

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Runs good for about 45 seconds then quits running starts right up again runs another 45 seconds then quits again


I have a altima that did this, turned out to be the fuel pump. But I would replace the fuel filter first and see if it solves your problem. Filters clog up, they will give the pressure to start , but wont give the flow and pressure to keep up.

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h

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