Question about Nissan 300ZX

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I have a 87 nissan 300zx. It cranks over but doesnt start. It has no spark or injector pulse. The ignition coil has power, both in and out. I even tried a new coil to see if there was spark and no luck. All fuses are good to. Please help i wanna drive this thing!!!

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1894 Answers

SOURCE: no injector pulse

hello sir,

absence of ground pulse means there is some kind of shorting circuit in your control circuit.

which can make the ground pulse to get shorted there itself preventing it to reach the circuit properly.

thank you

don't forget to rate the solution

good day

Posted on May 27, 2008

CMV9
  • 594 Answers

SOURCE: 1996 Buick Regal Custom w/3.1 liter-No Spark

disconnect you battery. take something and fray back the plastic on the main hot wire on the coil. take another wire and wrapp it to the main wire you just frayed. now take that wire and run it to you ignition fuse. re connect you battery and see if your vehicle will start. if so than you have either a break or a short in you hot wire for your coil.

Posted on Aug 01, 2008

johnny5846
  • 379 Answers

SOURCE: fuel pump relay

inside the door pillar , behind passenger door . sorry no picture . strange location but thats what the manual says . for 87 nissan 300zx . hope thats a fix ya !

Posted on Jan 08, 2009

  • 5 Answers

SOURCE: my 1987 300zx cranks but wont start.

I had the same problem last year mine turned out to be a crank sensor I don't know if that is your problem for sure mine wouldn't send any spark from the coil to the spark plug replaced crank sensor inside distributor and fired right up the dealership called it a cam sensor my book called it a crank sensor either way its in the distributor

Posted on Jan 21, 2009

  • 1201 Answers

SOURCE: car has no spark or injector pulse(new ecm,crank sensor)

Check the fuse for the injectors, some vehicles have the injectors and coil running on the same circut, at the same time check the fuse for the ignition.

Posted on Jan 30, 2009

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1 Answer

Wont start. it has injector pulse but no spark


is there power and ground to the coils?

If there is injector pulse than the crank sensor has to be good. Injector pulse and spark are both calculated off from the signal from the crank sensor.

Checking for power and ground to the coils is a good place to start. If that checks out than either there is a wiring issue in between the PCM and the coils or possible the PCM has failed.

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For no spark the crank sensor located in the distributor can be at fault also the power transistor. Either one of these failure will result in injector have no pulse. But you state no fuel pressure. The common of these two is power starting at the ignition switch when the ignition switch is turned on the fuel pump relay is activated and so is power going to the distributor and coil and injector so look for a open fuse including the funny square ones you may have to take the clear cover off to see it clearly.

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I have a 1988 300zx non turbo 3.0 just replaced the ecu thinking it was the problem but its not. My car will turn over and it sparks, tested the fuel pressure and it makes 42lbs so thats not the problem...


The pulse to switch the coils comes from the crankshaft sensor via the ecu. Pulse to switch injectors comes from the CAMshaft sensor via the ecu. Check injector wiring plugs and confirm there is an ignition live of 12v at one side. Other side should have an earth pulse when cranking.Once you know which is missing you can trace the fault backwards. ( if no ignition live then check wiring, relay, fuse etc) if no earth switching check camshaft sensor and wiring.

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1 Answer

1990 gmc 6500 topkick with no spark or injector pulse. all 4 wires on the ignition coil have battery voltage with key on. is coil shorted or is the ignition module bad?


You are jumping to conclusions. Slow down.
No spark AND no injector pulse indicates none of the desired outputs were triggered. The ignition module makes spark when it receives a crankshaft position sensor signal, and then transfers control of that spark to the computer after it starts. The module takes its crank sensor signal and generates an RPM count that it forwards to the PCM(main computer) which is used for triggering the injectors and controlling timing. SO, if you had a bad crank sensor OR a bad ignition module, you could lose both spark AND fuel. a coil would not disable injector pulse. modules RARELY fail in a manner that disables RPM reference to the computer causing it to not fire the injectors...At this point, I would TEST the crank sensor as the next step. If its easier, 1 of the wires on the module goes directly there so you can test the crank sensor at the module.

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1 Answer

Car has no spark or injector pulse(new ecm,crank sensor)


Check the fuse for the injectors, some vehicles have the injectors and coil running on the same circut, at the same time check the fuse for the ignition.

Jan 30, 2009 | 1996 Dodge Avenger

1 Answer

My 1987 300zx cranks but wont start.


I had the same problem last year mine turned out to be a crank sensor I don't know if that is your problem for sure mine wouldn't send any spark from the coil to the spark plug replaced crank sensor inside distributor and fired right up the dealership called it a cam sensor my book called it a crank sensor either way its in the distributor

Dec 16, 2008 | 1987 Nissan 300ZX

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