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Lost negative at the injectors - 1994 Ford Taurus

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The negative is the signal from the ecm, so you won't get a reading, use a noid light to check for signal

Posted on Nov 05, 2010

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Posted on Jan 02, 2017

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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

2 Answers

No fuel injection


If Ignition power is at all injectors then it's not a fuse issue . The computer triggers a negative pulse to the injectors to get them to trigger. If there is no negative pulse to 1 and 4 then most likely it could be a wiring issue or computer fault. Regards

Jan 06, 2014 | Fiat X1/9 Cars & Trucks

1 Answer

Fuel injector no negative in plugs injector is not open to start


please explain 'no negative' in plugs 'injector' is not 'open' to start'????

Apr 07, 2011 | 2000 Hyundai Accent

2 Answers

I need to replace the #2 fuel injector. Is this something a layman such as I can accomplish?


You could do it, but remember gasoline is flammable and volatile and can be hazardous to work with: REMOVAL AND INSTALLATION 1.9L Engines
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Properly relieve the fuel system pressure.
  3. Remove or disconnect the following:
    • Negative battery cable
    • Fuel rail
    • Fuel injector retaining clip off the injector
    • Fuel injector
    • Fuel injector O-rings and discard them Fig. 1: Fuel injector identification-1.9L engine 9306zg58.gif
    To install: NOTE: The SOHC and DOHC fuel injectors are not interchangeable. The injectors are identified by a color coded plastic ring near the bottom of the injector. The SOHC injector has a blue ring near the O-ring that mates to the intake manifold and the DOHC has a pink ring.
  4. Lubricate the new fuel injector O-ring with clean engine oil.
  5. Install or connect the following:
    • New O-ring seals on the fuel injector
    • Retaining clip to the fuel injector
    • Fuel injector to the fuel rail
    • Fuel rail
    • Negative battery cable
  6. Start the vehicle and check for leaks, repair if necessary.
2.2L and 3.0L Engines
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Properly relieve the fuel system pressure.
  3. Remove or disconnect the following:
    • Negative battery cable
    • Fuel rail
    • Fuel injector retaining clip off the injector
    • Fuel injector
    • Fuel injector O-rings and discard them
Fig. 2: Remove the retainer clip from the fuel injector - 2.2L and 3.0L engines 9306zg59.gif
To install:
  1. Lubricate the new fuel injector O-ring with clean engine oil.
  2. Install or connect the following:
    • New O-ring seals on the fuel injector
    • Retaining clip to the fuel injector
    • Fuel injector to the fuel rail
    • Fuel rail
    • Negative battery cable
  3. Start the vehicle and check for leaks, repair if necessary.
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Feb 14, 2011 | 1999 Saturn SL

1 Answer

I have fuel leaking from the fuel rail at the 2nd injector from the front. The leak seems to be coming from where the metal of the fuel rail conects to the plastic....


Maybe an O-ring is leaking. Try a new injector that comes with an o-ring to be sure it's not the injector itself.
Fuel Injector - for V8

REMOVAL & INSTALLATION


  1. Before servicing the vehicle, refer to the precautions in the beginning of
    this section.
  2. Relieve fuel system pressure.
  3. Remove or disconnect the following:

    • Negative battery cable
    • Fuel rail
    • Fuel injector retaining clips
    • Fuel injectors

    To install:

  4. Install or connect the following:

    • Fuel injectors, using new O-rings
    • Fuel injector clips to the fuel rail
    • Fuel rail
    • Negative battery cable

  5. Start the vehicle and check for leaks, repair if necessary.

Oct 30, 2010 | 2002 Jeep Grand Cherokee

1 Answer

How do i chage the fuel injector for a geo metro 1997 LSI?


REMOVAL & INSTALLATION Fig. 1: Removing injectors from fuel rail 84245032.gif
Fig. 2: Make sure injectors rotate freely in cylinder head 84245033.gif
  1. Relieve fuel system pressure and disconnect the negative battery cable.
  2. Remove intake air hose between throttle body and intercooler.
  3. Remove accelerator cable.
  4. Unclamp PCV and fuel return hoses from deliver pipe.
  5. Unclamp injector wiring harness.
  6. Disconnect injector coupler.
  7. Remove cold start injector pipe from delivery pipe.
  8. Remove vacuum hose from pressure regulator.
  9. Remove fuel feed hose from delivery pipe.
  10. Remove pressure regulator from delivery pipe.
  11. Remove delivery pipe with injectors.
  12. Remove injectors from delivery pipe. To install:
  13. Replace injector O-rings and lubricate with fuel. NOTE: Make sure injectors rotate smoothly. If not, probable cause is incorrect installation of O-ring.
  14. Check if insulator is scored or damaged. If it is, replace with new one.
  15. Connect delivery pipe with injectors.
  16. Install pressure regulator to delivery pipe using a new O-ring.
  17. Install fuel feed hose to delivery pipe.
  18. Install vacuum and fuel return hoses to pressure regulator and clamp securely.
  19. Install cold start injector pipe to delivery pipe using new gaskets.
  20. Install injector coupler. Clamp injector wiring harness.
  21. Install PCV hose to cylinder head.
  22. Install throttle position sensor coupler.
  23. Install accelerator cable and adjust free-play.
  24. Install intake air hose to throttle body and intercooler.
  25. Connect the negative battery cable.
  26. Start engine and check for leaks.
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Jul 03, 2010 | 1997 Geo Metro

1 Answer

Checked tps it is working on stem ok but


TURN OFF RADIO FIRST.REMOVE NEGATIVE BATTERY CABLE FOR A MINUTE OR TWO.RECONNECT NEGATIVE BATTERY.CRANK CAR UP LET IDLE TO GET OPERATING TEMPERATURE FIRST DONT ACCELERATE ENGINE.GIVE ENGINE TIME TO RECOGNIZE THE NEW TPS SENSOR.IF CAR STILL MISS REPLACE FUEL FILTER.CLEAN FUEL INJECTORS WITH A BOTTLE OF FUEL INJECTOR CLEANER BY POURING IT IN A FULL TANK OF GAS.DRIVE CAR AROUND SO CLEANER CAN FLUSH OUT THE INJECTORS.

May 15, 2010 | 1993 Buick Regal

2 Answers

My 2001 chevy blazer (v-6, 4.3L)., has a fuel injector problem and I would like to know how to repair the number 5 injector.


You will need to remove the fuel rail bolted to the intake manifold. There maybe a clip holding on the injector. Spraying some WD-40 on the ends of the injectors to aid removal, also when installing, spray some on the O-rings, will help in installing them. Make sure all are seated.

Mar 08, 2010 | 2001 Chevrolet Blazer

1 Answer

Misfire on number 6 cylinder have replaced injector and coil on 2000 dodge dakota 4.7


If you changed and the injector and the coil and does not work change the spark that cylinder and see if comes to that coil voltage (positive and negative) and is less negative than if the PCM does not work that coil. Thanks good luck and opinions please

Jan 29, 2010 | 2001 Dodge Dakota

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