Question about 1985 Nissan 300ZX

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On my 1985 nissan 300zx the fuel pump stops as the computer takes over idle causeing my car to stall, approx 30 seconds after turning the car on. I have trouble shot a little and have removed the fuel filter, the fuel pump and relay from the equation. Yet as soon as the computer takes over idle, something is cutting off power to my pump. I'm trying to locate the oil pressure sensor, but can only find the sender next to the filter, not the same component. Can anyone tell me where the sensor is or another step to take?

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  • big_shemo Jun 09, 2011

    Replaced ecu. Problem solved.

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  • 103 Answers

The ecu is on the passenger side behind the kick panel, there is instructions on how to do a self diagnosis and code definitions listed on the ecu

Posted on May 17, 2017

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pippall
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SOURCE: Brake light stays on at all times, ive changed pedal switch

Change the brake light switch.Located at the pedal

Posted on May 29, 2009

nyspeter86
  • 81 Answers

SOURCE: car wont start

Fuel delivery must be confirmed with a fuel pressure gauge on this vehicle. Disconnecting the fuel line and cranking the engine to see fuel shooting out does not confirm pressure, it only confirms fuel delivery. Remember you need both fuel delivery and pressure. On this vehicle if the psi is off by just one number that's enough to keep it from starting. Also replacing the coil and rotor (as you stated) does not confirm that spark is reaching the plugs. Confirm that both spark and adequate fuel pressure are reaching ALL the spark plugs.

Posted on Dec 28, 2008

  • 383 Answers

SOURCE: 87 nissan starts then stalls

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

  • 850 Answers

SOURCE: fuel pump relay

it should be near the battery ! there will be several different ones

Posted on Jul 20, 2009

motor1258
  • 6674 Answers

SOURCE: fuel pump relay

Try drivers side in rear hatch, ahead of wheel well area, behind trim panel.

Posted on Jul 20, 2009

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2 Answers

1985 Nissan 300ZX I want to disable the fuel pump to relieve the pressure before replacing the fuel filter. Is it a relay or a fuse?


No need to remove any relay. Proceed as follows:
- Park the car in shaded and well ventilated area.
- Remove the negative battery terminal.
- Loosen the fuel cap, fuel filter banjo bolt, push on or pipe clip.
- Wrap a piece of cloth around the connecting end of the pipe and remove the pipe.
CAUTION:
Let the engine cool down about half an hour before you proceed.
Keep your eyes away from the gasoline splash.
Keep any flame away.
Dry up the area immediately.
NOTE:
It is always better to get the job done by a qualified personnel.

Feb 23, 2014 | 1985 Nissan 300ZX

1 Answer

1986 nissan 300zx fuel problem


replace the fuel pump and check injectors.

Aug 01, 2010 | 1986 Nissan 300ZX

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Sounds like the warm start choke. It positions the carb butterflies when the car is warm and adjusts the fuel mixture.

Apr 02, 2010 | 1985 Nissan 300ZX

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check the ground connection for the fuel pump also check the connector

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Try drivers side in rear hatch, ahead of wheel well area, behind trim panel.

Jul 20, 2009 | 1985 Nissan 300ZX

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verifica la precion de gasolina es el regulador de precion.

Apr 06, 2009 | 1985 Nissan 300ZX

1 Answer

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I'd love to help, but none of my service manuals show your car having variable assist power steering. Even '86 and '87 don't have it. The electrical connection you see at the pump, is a power steering pressure switch. All it does is tell the ecm that the engine is under load at idle when you crank the wheel hard and it bumps the idle up a bit so you don't stall the engine, but that's all it does. If you like, I can send you two wiring diagrams depicting the all underhood electronics, but I think you probably have a bad rack and pinion. Seems like a common problem from the small amount of checking I did.

Mar 14, 2009 | 1985 Nissan 300ZX

1 Answer

My 1985 Nissan 300zx won't idle


Have the low idle sensor checked. That should be the solution.

Nov 17, 2008 | 1985 Nissan 300ZX

1 Answer

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alternator and mass air flow meter.
see my solution above.....
h

Jul 28, 2008 | 1985 Nissan 300ZX

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