Question about 1986 Nissan 300ZX

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1986 Nissan 300ZX will not stay running

Have a non turbo 300ZX with 49,000 original miles on it...The car has been sitting most of the winter and the battery had gone way down...
Recently some moron (that would be me) hooked up jumper backwards, but removed them after about 5 seconds.... Fuseable link is ok...Other than a couple of blown fuses, all is back to normal lights and accessory wise...
The car will start, run for about 5 seconds then die, and then will not restart. If I wait 15 minutes or so, it will start again, but will not continue running. I suspected something in the anti-theft system, but when I pulled fuses to diable anti-theft it would not turn over at all.
Any advice would be appreciated.

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Hello, you will want to replace all of the blown fuses, if you haven't. Is this an aftermarket alarm? Well, it really shouldn't matter, but if you remove the fuse it is disabling the starter. Thats part of the anti-theft system, its like saying if I was a thief I could steal your car if I removed that fuse. So thats why it has to be in their which you already found out. Make sure that after you replace all fuses close the doors, make sure you have the key it may automaticly lock the doors, but disconnect battery ground. Wait five minutes then reconnect ground. It should start normally then.

Posted on Mar 02, 2009

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Hi,

Sounds to me you either have bad gas or their is an issue with the fuel filter or fuel pump. I cant believe your friend did that, sorry I had to laugh. I don't think the two problems are connected though. Change out the fuel filter first and add some treatment to the gas to knock out those two possiblities first. If that doesnt fix it I say its the pump is going bad. I am 99% possitive that its the filter, http://www.importpartspro.com/ni30fufi.html

Armymason

Posted on Mar 02, 2009

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It's very possible you might have blown the pcm or pcm fuse. try checking the fuse.

if thats not the problem check the alternater fuse.
also check the dome light fuse. some times the dome light fuse can cause problem because anti theft might run though radio. and dome light fuse controls some functions of the radio. Also check fuses for fuel injectors and fuel pump.

hope this helped.
if not let me now with more info.
please remember to rate me.

Posted on Mar 02, 2009

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Sounds like a fuel problem. First change the fuel filter. If the problem presists after this, look at other areas such as the fuel pump, fuel pressure regualator, etc. 

Posted on Mar 02, 2009

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I doubt it is in the electrical syst. Try this, attempt to start the engine, DO NOT TOUCH THE GAS PETAL....NO GAS, just turn the key to start the engine. let it sputter as it attempts to start/run..stay off the gas. if it starts, sputters, and dies, try again...NO GAS PETAL. If it starts, sputters, and dies, let it, do not touch the gas petal. Try again, no gas petal. The key here is to determain if it sputters longer each time it attempts to run. If it is getting closer to running, continue doing this until it is started or until it stops firing. If it has stopped firing, attempt to start as normal.

let me know what the engine is doing (keep the jumper cables handy)

clarkco

Posted on Feb 10, 2009

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Hey,it sounds like the anti theft is working,
This may sound dumb, but you need to reset the computer by disconnecting the battery for about 5 minutes.

If this doesn't work,you may have fried the key sensor inside the ignition.

Posted on Feb 10, 2009

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Try to do a keep alive memory reset first.Disconnect the battery and then press brake pedal and leave disconnected for 30 minutes.Then hook it back up and see if it will run ok then. Sometimes if voltage goes low it will also effect the closed throttle reading that is stored in memory of PCM so now instead of PCM thinking 1v should be idle it may think 0.5 v is idle and try's to get it there and causes a stall.

Posted on Feb 10, 2009

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You may have blown one of the sensor oor damaged the ECU, you need to scan the ECU with a code reader to find out the problem.

Posted on Feb 10, 2009

  • Ginko
    Ginko Feb 10, 2009

    Apart blowing fuses you have probably caused more damage.

    This car has an electronic injection system that uses several sensors and a computer module that can have been easily damaged during the accident.

    To find out what the problem can be you need to connect the ECU (car computer module) to an ODBII code reader.
    This will return error codes that will tell you where the problem is.

    If you do not have the equipment and know how to do a code reading at home, you can have it done at any qualified garage.

    See also links below:

    Actron Pocket Scan Plus OBD II Code Reader


    OBD-II code readers: Listen when your car speaks




    OBD FAQ: What is an OBD-II Code Reader



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Dear llama470: there is a fuel pump relay located in the worst possible place Nissan could possibly think of! In the right 1/4 panel just forward of the wheel house. You have your work cut out for you if you want to get to it.
1st remove the sill plate from the door opening.
2.nd remove the trim panel which goes across the roof behind the seat (most 300ZX's are "t" tops")
3rd carefully gain access to the interior 1/4 panel. I gave you these instructions because the plastic gets very brittle and cracks easily when stressed. Anyway, as you remove the panel, just about 1.2 up the 1/4 just behind the door striker is a GREEN relay. That is the starter relay. The relay is energized by the ECM. There is a black wire with a few traces or red dots along the way which will end up going to pin # 108 on the ECM connector. If you ground this wire, the relay should click and the pump should run. Most Japanese cars make and break the grounds, not the positives, so the positive will be hot as soon as you turn on the key. The reason it will start then die, is because the fuel pump has two circuits to run on. One relates to the cranking circuit which will energize the relay and the other will only energize it after the car has started. This was designed so that if the car were in an impact, the impact would kill the fuel pump. NOW, The ECM is what runs the relay after the car has started. you may need to try another ECM.
The fuel pumps are easy to get to on this car. Remove the foam insulating floor covering behind the seats and you will see a large round metal plate with a wire harness going through it. There are quite a few bolts going around the perimeter to retain the plate. NOTE! BEFORE YOU REMOVE THIS PLATE, BE ABSOLUTELY SURE THE PUMP DOES NOT RUN.
Here is another way you can check:disconnect the starter solenoid and with the help of a friend, have them hold the key in the start position. You should hear a kind of shishhhhing sound coming from around the fuel lines. Also, prior to turning the key, pinch the fuel hose where the fuel filter is and you will notice it is easy to pinch flat. If the pump is working, when you turn the key to the cranking position and hold it, try pinching it again. The hose will now fee; some what hard. This would indicate it has fuel pressure, thus indicating the pump is working. Which means is all likely hood the ECM is probably the culprit. Most other components wont keep it from running, it will just run badly. Let me know how you do. Good luck
mybunkey

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