Question about 1990 Nissan 300ZX

1 Answer

90 300zx fuel pump works its getting spark be injectors wont open what can be the problem?

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Nissan Master
  • 5,362 Answers

Possibly a computer (ECCS control unit) malfunction, but first check the white/black wire going to each injector. All should have power on them with ignition key in on. This white/black wire comes from the computer's pin # 58, then is spliced to all 6 injectors. If no power to injectors, check the wire continuity from the ECCS' #58 pin to the injectors.

The ground wire from each injector also goes into the control unit, but individually, so that the control unit may ground the injector circuit and cause pulse.

If the wiring is good, no breaks or shorts, it may be a computer malfunction, but first find out if the variable valve timing affects injector pulsing. I don't know anything about it, but you have 2 VTC (valve timing control) solenoids, one for each side of the engine. Both are located near or on the firewall behind the engine, near the middle. Looks like 3 solenoids there, the middle one is the EGR solenoid, and the VTC solenoids are on each side of the EGR solenoid. Best I can do from a very poor wiring diagram I was looking at.

You checked for spark, but did you check on all six plugs for spark?

Posted on Apr 08, 2015

  • montehammons Apr 09, 2015

    Now if you really want to know a lot about your 300zx, even more than you could get from a Haynes or Chilton repair manual, you could spend $16.99 for a one month subscription to Mitchell 1's DIY auto repair site. It is at eautorepair.net. I took a one month subscription for my 1987 Sentra, and finally understood the functions, capabilities, and limitations of the ECU/ECCS system in my car. You would not believe how badly Chilton messed up their descriptions, after combining several years models into one chapter on the electronics. The diagnostic capabilities changed the most from year to year, and the subscription helped me sort mine out. If you are into DIY, you should check it out. Alldata has a much similar site for complete DIY, but they do not provide monthly subscriptions, only annual. The Mitchell site also has annual subscr. for about $26, If I recall.

×

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I have a 1985 toyota pickup 4/4 that is not geting spark to injectors or any fuel to fuel rail how do i solve this?


That may be two different problems. Or not.
You may have a relay problem that feeds power to the pump and the injectors but I doubt it.
Usually the injectors get power from a relay or other source, and the computer provides ground to open them.
You'll probably need to get a wiring diagram from the library or buy a shop manual to check the circuits.

Jun 28, 2012 | Toyota Cars & Trucks

1 Answer

95 olds 88 3.8l wont start i have fuel and spark......i had loss of power on the way home from work and it died in my drive way and now wont restart it does have a new crank sensor and fuel pump


It may be time for a pro to look at it. You dont want to guess wrong on a PCM. Are you sure you have Injector pulse? One side of the fuel injectors should have power and the pcm grounds them to make them open. If the engine runs on carb cleaner its not getting fuel.

Jun 02, 2012 | 1995 Oldsmobile 88

1 Answer

The dash gauges all work , fuel pumps are both good , the fuel pumps wont come on and the truck trys to fire when i turn the ignition on but wont , could this be a fuel regulator


did you check the fuel pressure pump on the frame rail for power and ground? have you verified no ignition spark to the spark plugs? have you checked for fire from the coil to the distributor cap? does the check engine light come on when you turn the key on? have you check for injector pulse and power at the fuel injectors? if the fuel pump won't come on and you have no ignition fire and no injector pulse, all of these systems are triggered by the ECM.

Aug 12, 2011 | 1990 Ford F150

1 Answer

My car wont start,you turn the key , and sounds like it's going to start but it just wont' i already take to the mechanic he had the car for about 2 months i get the car back ; he said it was fix and now...


FIRST GET A SPARK TESTER TO SEE IF YOU ARE GETTING SPARK AT SPARK PLUGS.IF NOT CHECK IGNITION MODULE FUSE.IF FUSE GOOD HAVE CAR HOOK UP TO SCANNER LOOK FOR IGNITION MODULE FAULT CRANKSHAFT SENSOR FAULT AND PCM FAULT.IF ALL LOOK GOOD SO FAR.CHECK TO SEE IF FUEL PUMP WORKING.CHECK PUMP FUEL PRESSURE IT SHOULD BE 41 - 47 PSI. IF NOT REPLACE FUEL FILTER STILL LOW REPLACE FUEL PUMP.IF FUEL PUMP NOT WORKING AT ALL CHECK FUEL PUMP FUSE AND RELAY.IF BOTH IS GOOD FUEL PUMP AT FAULT.BUT SCAN TO CHECK FOR PCM FAULT CODES IT CONTROL SPARK AND FUEL SYSTEM.MAKE SURE SPARK PLUGS AND WIRES IS GOOD. ALSO CHECK FUEL INJECTORS FUSE ALSO.

Jun 08, 2010 | 1999 Oldsmobile Alero

1 Answer

My 98 explorer turns over but will not start. The fuel pump kicks on for half a second, then immediately shuts off. Does anyone know how to go about fixing this?


your truck has two sensors that are in control.There is a camshaft sensor that controls when the fuel injectors open according to camshaft position.If this one is bad the fuel injectors wont open and the engine wont get any fuel.It also has a crankshaft sensor that is in control of allowing spark to the propor spark plug at the right time.If this sensor is bad you will not have any spark to any of the spark plugs.The fuel pump will only run for 2 to 3 seconds unless the motor starts,it is designed that way and it primes the fuel system and brings it up to pressure.(aprox 40 psi )

Jan 09, 2010 | 1999 Ford Explorer

1 Answer

Old j reg mercedes 230te wont start


Check Injectors spraying Fuel when you start. Fuel pump prime because you hear the pump. IF pump is weak, then your Fuel distributor doesn't have correct pressure to spray fuel when injectors open. Do your sparks plug wet after trying several times. If they are dry then you don't have fuel. Replace injectors If they are wet then you don't have correct air:gas ratio of 14.6:1. Replace Fuel distributors

Aug 10, 2009 | 1993 Mercedes-Benz Mercedes Benz 300 Class

3 Answers

Ford focus tdci wont start fuel gettin to injectors can u help 2005


Check the electric stop on the injector pump is working.

Aug 07, 2009 | 2005 Ford Focus

1 Answer

1995 FORD EXPLORER 4X4 6 CYL 4 DOOR WONT START


Fords have inertia fuel cut off switch. You need to check that first. If you dont have fuel. If you have fuel and no spark you need to check for inj pulse to injector. Make sure no fuses are blown. If no spark and no injector pulse then replace cranksensor.

Dec 17, 2008 | 1998 Chevrolet Cavalier

2 Answers

1990 montero no start. No power to open injectors, good fuel pump


Check the injector pulses with an osciliscope. If you arent getting a pulse check the ecu. I have cooked 2 of them. One killed my ignition but had good fuel. the second time it wouldnt open the injectors but had good spark. A quick check is to take the ecu out and take the cover off. then look for burnt electrical components.

Nov 20, 2008 | 1990 Mitsubishi Montero

Not finding what you are looking for?
1990 Nissan 300ZX Logo

88 people viewed this question

Ask a Question

Usually answered in minutes!

Top Nissan Experts

yadayada
yadayada

Level 3 Expert

76846 Answers

Phil Lovisek
Phil Lovisek

Level 3 Expert

726 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

Are you a Nissan Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...