Question about 1987 Nissan 300ZX

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87 nissan starts then stalls

87 nissan 300zx starts then stalls fuel pump & regulator are 1 yr. old it will idle but if you tough the gas pedal it stalls

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  • josh baker Jul 14, 2009

    no air leaks spark is fine all new plus msd sci ignition msd blaster coil
    did stay running when I pinched the return line but could not rev it

  • josh baker Jul 14, 2009

    no air leaks spark is new also I pinched the return hose and it stayed running but could not rev it

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  • Nissan Master
  • 383 Answers

Jdmbaker: There are a few areas I would suggest looking in.
First, I would be looking for a false air problem. This is a condition where you have un-metered air getting into the engine. A torn airflow meter boot, or large vacuum leak such as a split pcv hose.
Second, your injector pulse width is primarily dependent on the coolant temperature sensor. This component is located at the front of the motor just below the thermostat housing. The sensor gives the ECM resistance values based on the temperature of the coolant. If the sensor fails, usually, they have a tendency to create a lean condition. This shortens the pulse width of the injectors which essentially starves the engine for fuel. One way you can perform a quick test for a lean condition, is to pinch off the return hose for the fuel going to the tank. If you look at the fuel hoses, they run right next to each other. You have one which comes from the fuel filter. That is the feed line. Pinch the other hose. This will boost the fuel pressure causing more fuel to be sprayed out of the injectors.With the hose pinched, hit the throttle, if the engine will rev up, you persue the lean condition theory.
Third. Check for a weak spark. A severely worn cap and rotor or bad plug wires can cause a hesitation and stalling problem if they are bad enough.
Fourth. The air flow meter could be faulty. This is a very common symptom matching you description.
Odds are that one of these are the solution. Good luck and let me know how you do.

Posted on Jul 14, 2009

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