Question about 1991 Nissan 300ZX

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I checked my 91 300zx because its only working off 5 cylinders.i already checked the injector for power and ground.the car cant go fast because it wants to idle down i was thinking if it could be my computer making that miss-fire.

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Ineed the code #

Posted on Apr 17, 2009

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I have a 1996 Sierra 4.3 v6 and I'm getting injector pulse to all my injectors except the no.2 cylinder. I have a new igniter, coil, cam and crank sensors, and injector what's going on????


If all injectors are working but #2 the power supply should be ok as there is one fuse for all injectors controlling power. However, I would check for power anyway at the injector harness to ensure there is no wiring issue. The ground side is controlled by a driver inside the computer. If power is good then there is a grounding issue causing the injector not to operate. Either the computer has an internal fault or the ground wire from the computer to the injector has a break/high resistance

Jul 09, 2015 | Cars & Trucks

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No injector pulse 4 cyl 93 f250 460


if you have a $5 test light, you could find the problem. just know that all eight injectors have a constant voltage applied to them anytime the key is in run or start. and also that 4 of the injectors share a common ground, they have their ground wires spliced together before the ground wire enters the pcm to be internally grounded. and the other four injectors are the same- their ground wires splice together. so your four that don't pulse have lost either the power to them, or the common ground wire for the 4 may have broken. or lost connection.

it is easier to check the power side first, so clip a test light lead to the negative battery post or cable, turn the key to on,and probe each injector connector. one of the terminals at all eight injectors will be the power wire, and it should light up the test light. if all eight injectors have power to them, you know it must be a ground side problem. if you find that 4 injectors have no power to them, look for a broken splice in the power wire to all injectors. back in those days, injectors were "bank fired". one side or bank of the engine all had the injector grounds spliced together, so all injectors on one bank fired (pulsed) simultaneously, and then the other bank was fired or pulsed. that was good until sequential injection matched the pulse to the cylinder ready to fire, more precise, and in the modern systems each injector ground has a separate ground inside the pcm. no more splicing of the ground wires, and having bank fired engines.


when the pcm grounds the circuit, the injector coil is energized and the injector opens to spray fuel out. so the injector has constant voltage to it. only when the circuit is grounded is that power applied across the injector.

Jan 22, 2015 | Cars & Trucks

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Hi I have a 2004 mustang gt and we change the fuel pump and fuel filter and then we check the injectors with a tester and bank 1234 on the passenger side is out and 5678 on the left side is on and ain't no...


Sounds like the power splice to bank one is lost. By injection tester, do you mean a noid light?

Do you understand how the fuel injection circuit works? When the ignition key is in the on position, all of the injectors will have constant battery voltage applied to them. Bank 2 (#'s 5,6,7,8) is good- they are all pulsing. The same power wire is spliced to all 8 injectors. The other wire at each injector is the ground wire, and each ground wire goes separately into the engine computer to be internally grounded for a split second. That is the pulse of the injector, and is when it sprays fuel into the cylinder.

So think about it. Your 5,6,7,8 is working right, but 1,2,3,4 are not pulsing. Not likely 1234, all 4 separate ground wires, just went bad like that. More likely that 1234 not getting voltage to them through that common hot wire. You can check it real fast: check for voltage on any injector connector on bank 1, with the key in ON. The inj. connector only has two wires, a power and a ground wire. One of them should be hot in on. If no power on bank 1 injectors, trace it back to the engine harness. Somewhere, the power wire will splice off between bank 1 and bank 2.

Nov 04, 2014 | Cars & Trucks

1 Answer

Cylinder 1 and 4 not firing


have you checked for codes. you should have power and ground at the coil plug. note the computer is what grounds the circuit to fire the ignition coil. if you don`t have a ground then it could be a bad coil driver in the computer, which means you will have to have the computer replaced a possibly programed to the car.

Aug 16, 2014 | Cars & Trucks

1 Answer

No injector pulse on cylinder number 6 ?


check for power and ground at the injector harness plug. the computer supplies power all the time with the key on then when the car Is running the computer grounds the circuit to allow the injector to function. if you have no power then you will have to check the wiring to find the open. if you have no ground side then you will have to check the ground circuit at the computer. if there is none then you may have an injector driver gone bad. if you have ground at the computer but not at the injector then check the wiring between the two.

Jul 30, 2014 | Buick LeSabre Cars & Trucks

1 Answer

3 rear cylinders not firing


Check the grounds from the rear injectors to the computer. On a bank fired system as yours, all 3 injector grounds on each bank splice together before they go into the computer. Check wire continuity from injector to the computer connector with the ohmmeter.

Jul 21, 2014 | 1989 Oldsmobile Cutlass Ciera

1 Answer

04 400ex has lots of spark cpmpression and fuel timing is correct i dont no wat else to do


Did you check fuel pressure with a gauge? Autozone, some others, rent or loan fuel pressure gauges. If fuel pressure is good, check injector circuit. Each injector has two wires-power and ground. With key on- engine off, each injector should have battery voltage on the power wire (each power wire would be same color to all injectors)-use a test light or voltmeter to check for power.

If injectors have power to them with key on, post back and I can tell you how to check injector ground circuit with a test light. .... well here, you clip the test light lead on the POSITIVE battery post, and stick tester probe into the ground side terminal of injector connector. Now have someone crank the engine over: if ground circuit is good, the test light should be blinking. If both tests work, power and ground circuit, then injector circuit is good and they should be pulsing to spray fuel into the cylinders. Let me know what you find.

Jun 08, 2014 | Cars & Trucks

1 Answer

P020 and P0302 Error codes


You need to have the injector circuit for cylinder 2 checked. Possibly the ground for the injector-which goes into the engine computer-may have a bad wire. The power wire for the injector should have power on it anytime the key is on. When the computer internally grounds the individual injectors, the injector will pulse, or spray fuel out into the cylinder. When the injector circuit malfunctions, no pulse, and you get the misfire.

Nov 14, 2013 | 2005 Cadillac CTS

1 Answer

I have a 4 cylinder gsx eclipse but im getting a p0205 code which is a injector circuit malfunction in cylinder 5. why would i get this code?


CODE PO205 - IS INJECTOR 5. YOU NEED TO USE FUEL INJECTOR NOID TEST LIGHT OR A STETHOSCOPE TO CHECK ALL FUEL INJECTORS TO SEE OR HEAR WHAT FUEL INJECTOR NOT WORKING.USE TEST LIGHT IF BLINKS FUEL INJECTOR GETTING POWER.THE STETHOSCOPE USE IT LIKE A DOCTOR TO HEAR WHAT FUEL INJECTORS WORKING.YOU SHOULD HEAR CLICKING NOISE IF YOU HEAR NO INJECTOR NOISE AND IT IS GETTING POWER.THE FUEL INJECTOR IS FAULTY.

Nov 09, 2010 | 1995 Mitsubishi Eclipse

2 Answers

92 ford probe with two cylinders dead one on each side. i do get spark, fuel, and compression. but i dont get fuel in the cylinder but the injectors are not clogged.


Check the pulse on the two injectors.Purchase a noid light at the parts store,that will fit the injector harness,see if the noid lights will flash,if they do,then replace the injectors,this would be the only thing it could be.If the noid light is not puling,or flashing,then the computer is the problem,seeing it is the distributor of the pulse on time.

Nov 25, 2009 | 1992 Ford Probe

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