Question about 2000 Ford Taurus

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2003 FORD TAURUS 3.0 VIN S LOST INJECTOR PULSE, WILL START FOR 2 SEC STALLS AND PULSE IS LOST, HAS RPM REF AND SPARK

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  • RUSSELL STICKEL Mar 25, 2011

    FUEL PRESSURE IS GOOD AND IN SPEC RAIL SENSOR TEST GOOD AND FUEL PUMP OPERATING PROPERLY

  • RUSSELL STICKEL Mar 25, 2011

    fuel pressure is not the problem injector pulse drops off

  • RUSSELL STICKEL Mar 28, 2011

    FUEL PRESSURE IN SPEC WITH NEW IPS INSTALLED NO CHANGE

  • RUSSELL STICKEL Mar 28, 2011

    confirmed with logic probe lost after initial start cycle key and will start every time for a second or two then dies, continue cranking through and rpm ref and spark still present cam sensor shows constant inj ohms good fuel pressure in spec

  • RUSSELL STICKEL Mar 28, 2011

    IT FUNCTIONS AS WELL AS A NOID LIGHT AND TO ANSWER YOUR OTHER QUESTION YES I HAVE RUN THOSE TESTS AND YOUR COMMENT ABOUT I HAVE NO CLUE IS OUT OF LINE DON'T LET YOUR FORD EGO GO TO YOUR HEAD !!!!! I ALSO HAVE 30 YEARS EXP SEVERAL I N DEALERS AND HAVE OWNED A SMAAL SHOP WITH 7 BAYS AND 4 TECHS FOR 10 YEARS BUT HTIS AN OFF THE WALL PROBLEM AND I AM ASKING FOR ASSISTANCE NOT A LECTURE FOR YOU !!!!!!!!!!!!!!!

  • RUSSELL STICKEL Mar 28, 2011

    I QUESS THE COMMENTS CAN NOT BE READ BY EVERYONE FUEL PRESSURE IS PRESENT RAIL PRESSURE SENSOR GOOD FUEL PRESSURE WITH IN SPEC ON SCANNER AND DIGITAL GAGE SPARK IS PRESENT RPM REF PRESENT AND WILL START AFTER EVERY KEY CYCLE THEN STALLS TRIED NEW PCM NOT THE PROBLEM

  • RUSSELL STICKEL Mar 28, 2011

    timing fine not the problem injector pulse drops out at times it may start and run for a period of time and run fine. have not ruled out poor connection but have never lost comunication with scan tool and still have spark and tach ref while cranking

  • RUSSELL STICKEL Mar 28, 2011

    no apparent signs of moisture intrusion or pin damage suspect wiring connection but all inputs and output appear to be communicating with scanner properly sensors readings are good coolant, air, mass air, crank and cam tried pcm with no success

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5 Answers

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  • Ford Master
  • 17,970 Answers

Are you check right fuel pressure to the check valve on the fuel rail, the spark is there, the timing is correct, it cranks over fine? You'll probably need to do some pinpoint checks to see if the drivers are working. Are you scanned the PCM to know exactly what fault code is stored?

Keep in mind that the EDIS ignition will not function without a valid PIP signal. However, when dealing with computer modules and circuitry, intermittent-type problems are not all that uncommon, so you can't rule out a component just because you know that it works properly some of the time.

Keep us updated.

Posted on Mar 28, 2011

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  • Ford Master
  • 1,940 Answers

Fuel is metered into each intake port in a sequential firing order. Fuel injectors pulse to follow engine firing order in accordance with engine demand on a tuned intake manifold.

The basic fuel requirement of the engine is determined from the data supplied to the powertrain control module (PCM) by the mass air flow (MAF) sensor, which measures the amount of air being drawn into the engine.

Other sensors are used to measure:

  • air temperature
  • engine coolant temperature
  • engine speed
  • exhaust oxygen content
The various sensors detect any changes in the operating conditions and send signals to the powertrain control module. This permits the powertrain control module to control the opening duration (pulse width) of the fuel injectors and maintain optimum exhaust emission control and engine performance for all operating conditions.

The fuel injectors:
  • uses replaceable O-rings.
  • is electronically operated by the powertrain control module (PCM).
  • has an internal solenoid that opens a needle valve to inject fuel into the lower intake manifold.
  • atomizes the fuel as the fuel is delivered.
  • is deposit resistant.
CAUTION: The fuel injectors and the fuel injection supply manifold must be handled with extreme care to prevent damage to sealing areas and sensitive fuel-metering orifices.

The fuel injection supply manifold:
  • receives fuel from the fuel supply line.
  • delivers fuel to the fuel injectors.
  1. Key on, engine off for 5 seconds.
  2. Key off.
  3. Visually inspect the complete fuel delivery system, including fuel lines, connections, fuel rail, pressure regulator and fuel injector areas for leaks (hissing noise), looseness, cracks, kinks, pinching, or abrasion caused by a collision or mishandling.
  4. Visually inspect electrical harness and connectors for loose pins, corrosion, abrasion or other damage from collision or mishandling.
  5. Verify vehicle has followed maintenance schedule.
  6. Inspect fuel filter element for contamination and service as necessary.
  7. Verify Inertia Fuel Shutoff (IFS) switch is set.
  8. Verify vehicle battery is fully charged.
  9. Verify electrical/fuse integrity.
  1. Measure voltage between the FSV PWR and GND circuits at the fuel tank solenoid shut-off valve harness connector. Is the voltage reading greater than 10.5 volts?
  2. Is the fuel pressure reading between 552 to 827 kPa (80 to 120 psi)?
  3. Remove vacuum hose from fuel rail pressure sensor. Inspect sensor and hose for fuel. If fuel is present, replace the fuel rail pressure sensor.

It sounds like you may have a bad PCM, or computer. You will need to scan this vehicle using a NGS Scan Tool. If you don't have one, you will need to have a Dealership scan your computer and sensors to figure out if your PCM is bad, or it is just a bad sensor.

The Sensors help the PCM control the Fuel Injectors, but the PCM is what controls the Fuel Injectors. If the wiring is fine, you probably have a faulty PCM.

Posted on Mar 28, 2011

  • Jeremy Moore
    Jeremy Moore Mar 28, 2011

    Have you had your Timing Checked? You might also want to check your Main Relay, Fuel Pump Relay, Ignition Switch, Injector Wiring, Injector Resistance, and Injector Leakage. If you PCM is fine, your timing is correct, your injectors are getting the signal from the PCM to spray fuel, the fuel rail is pressurized, and the injectors operate correctly, you should have no problems.

    This issue almost sounds due to bad wiring. When the engine starts, it may move slightly, causing an intermittent connection loss, then the engine dies. This is a long shot, but it is possible.

    Are you sure the engine is really starting up for a couple of seconds, or does it just partially combust and then die? I would check the timing since everything else seems to be checking out.

  • Jeremy Moore
    Jeremy Moore Mar 28, 2011

    Inspect the connectors for corrosion, broken clips, bent pins, etc. Repair as necessary. You may want to try spraying some Electrical Contact Cleaner on the connector terminals to see if this helps.

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  • Ford Master
  • 76,846 Answers

Hello
Have you run the OBD2 electronic engine control fault code test? both the of the tests must be done and the result's diagnosed, that is the key on engine off test (KOEO) and the key on engine running test (KOER) as well. How have you confirmed the injector pulse is lost? each injector has its own driver in the PCM (Powertrain Control Module), the injector grounds the injectors to open them in the proper sequence, it is the same as the firing order of the spark plugs. To confirm loss of injector pulse you use a little tool known as a "NOID", they can be bought at any good auto parts store for about $5.00, they contain a little light that flashes when the injector pulse is present, it plugs into the harness connector at each injector. Each injector shares the same Battery (+) circuit and is powered off of a fuse and it in turn is powered off the ignition starter switch.

Posted on Mar 28, 2011

  • 1 more comment 
  • yadayada
    yadayada Mar 28, 2011

    You have not answered even one question I asked, yet immediately reject my help?? I think based on what you have written you have no clue, so please read and follow the very well grounded advice I gave you. I am a Ford certified Master technician in Ford electronic engine control systems. UI speak from decades of experience. Good luck.

  • yadayada
    yadayada Mar 28, 2011

    Logic probe?? what is that?? I have access to every factory tool for diagnosis of this type of problem and that is not one of them. All you need is a live data system scanner like a Ford NGS and a Digital Volt Ohm Meter

  • yadayada
    yadayada Apr 01, 2011

    Hello again

    I requested specific information so I could try and help, not to insult you, ego has nothing to do with this. In the future be forth coming about everything you have done in the first post, It toke four exchanges of information before you really answered my questions as to what tests were done. And the Logic test, I did this a long time and I still do not know what you are referring to here, maybe just a different term for a common test procedure known to me as something else?? Sorry for any hard feelings you might have, I was never trying to hurt your feelings or degrade you. I just thought you were a home mechanic (like 99% of the problem posts) and based on the problem you presented I thought it was over your head due to the training and equipment needed to do the large number of diagnostic tests. You never indicated your level of automotive training, I only mentioned my certification to let you know that I know the product and am not some want to be expert with no Ford training. There is no need to attach me on a personnel level, I was just trying to help. It is obvious you are frustrated with this car, it is just a car and it will get fixed, if not by you then some other technican.

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  • Ford Master
  • 14,036 Answers

CHECK CAMSHAFT SENSOR WIRES COULD BE LOOSE DISCONNECTED.IF ALL LOOKS GOOD PRPBLEM COULD BE FAULTY CAMSHAFT OR FAULTY PCM.BOTH FIRES THE FUEL INJECTORS.

Posted on Mar 25, 2011

  • Jonah Oneal Mar 28, 2011

    problem could be pcm or camshaft sensor since both fires the fuel injectors

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  • Master
  • 4,044 Answers

Symptom indicates your losing pressure on the fuel rail which indicates the fuel pump is cutting off. Put the ignition in the "ON" position and then test the pressure on the fuel rail. If there is no pressure or less than 35lbs of pressure on the fuel rail with the key in the "ON" position the fuel pump is faulty. If there is more than 45 lbs of pressure on the rail you have the same problem and the safety is killing the fuel pump to prevent damage.

Posted on Mar 25, 2011

  • James Young Mar 25, 2011

    The Injector pulse drops off if fuel pressure fluctuates, it is a safety feature built into the vehicle. The only other source for the ignition relay or ignition switch shorting.

  • James Young Mar 28, 2011

    Then your problem is in the ignition switch, ignition relay area. replace both and see if that solves the problem. If neither works then you have a much bigger problem and will need dealer diagnostics to isolate it.

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Comments: Jun 29, 2009 - Because I don't know your VIN number/letter:

a62dab4.gif Jun 29, 2009 - 2001 Ford Taurus
3.0 liter V-6 DOHC VIN "S"

This goes to the one above.
Jun 29, 2009 - This goes to the first photo:

2001 Ford Taurus
3.0 liter V-6 VIN "2" Jun 29, 2009 - Sorry....this goes to the first photo:

2001 Ford Taurus
3.0 liter V-6 VIN "U" Jun 29, 2009 - This is 2001 Ford Taurus
3.0 liter V-6 VIN "2"

It is the same as VIN U:

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