Question about 2001 Ford Expedition

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2001 4.6 engine stubbles

I have gone threw the ignition( plugs and coils, all). Replaced all the o2 sensors. Installed an K and N cold air kit. Replaced the fuel filter. The engine will stumble when stopped and in gear. Under acceleration it acts sluggish and then takes off. No codes from computer. Help

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  • dmiller102 Jul 21, 2008

    My 2001 Expedition XLT does the exact same thing. I was researching the O2 sensors when I came accross your post. It almost feels like something in the motor is off balance, or the car is running out of gas. Maybe the fuel filter? I figured the O2 sensors were my best bet, but after reading your post, I am not so sure. I'd like to get a handle on it before I spend a bunch of money.

  • Anonymous Aug 02, 2008

    Mine does the same thing. The dealership says I have 3 bad ignition coils. It just went over 100K, so I am going to replace them and all the spark plugs this weekend. Will keep you posted.

  • dwillis Aug 06, 2008

    mine too! i have replaced the fuel filter the air filter and the fuel pump.
    not fixed yet!!!!


















  • misstrish Nov 13, 2008

    I had the same problem as well. Had all coils and spark plugs replaced, new fuel filter, and new fuel pump. Better afterwards, no stuttering now. However, now it will die while driving, even at high rates of speed. Just dies, at stop signs, on highway in traffic... What in the world?

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Air flow sensors

Posted on Jan 07, 2009

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01 jgc 4.7L filled tank then it start missing bigtime. threw o2 code replaced them, codes gone but no change. changed fuel filter and put in dry gas, no change. had a guy put a placebo fuel source on with...


Hi, It is very odd not find a cause or at least verify all the injectors and components with a DRB scanner. If the engine is missing, something should have been shown on the DRB. What happens when you use the DRB to activate engine management components with the engine off ? Has the spark plug been checked or replaced & touqued to the correct spec?

Sep 24, 2011 | 2001 Jeep Grand Cherokee

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2001 silverado po300 code and po135 code changed 2 o2 sensors still coming up have not changed driver side o2s yet


Well the P0300 code has nothing to do with your O2 sensors just a heads up.

P0300: Random/Multiple Cylinder Misfire Detected

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crankshaft position (CKP) sensor (POS) signal to vary, Powertrain Control Module (PCM) or Electronic Control Module (ECM) can determine that a misfire is occurring.

Causes:
- Improper spark plug
- Insufficient compression
- Incorrect fuel pressure
- The injector circuit is open or shorted
- Fuel injectors may be faulty
- Intake air leak
- The ignition signal circuit is open or shorted

Solutions:
- Perform Injector Service
- Replace Spark Plugs
- Replace Injectors
- Replace Ignition Coils

P0135: O2 Sensor Heated Circuit Malfunction Bank 1 Sensor 1

The front heated oxygen sensor (or sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the ECM. The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.

Causes:
- Harness or connectors (The sensor circuit is open or shorted)
- Front Heated oxygen sensor (Bank 1) may be faulty

Solutions:
Replacing the O2 Sensor 1 usually takes care of the problem

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2 Answers

P0305 code, new plugs, wires, cap, rotor, coil, fuel filter and still getting p0305 code any good ideas?


means misfire in #5 cylinder. found this for you. hope this helps
Common Problems That Trigger the P0305
  • Worn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable)
  • Incorrect ignition timing
  • Vacuum leak(s)
  • Low or weak fuel pressure
  • Improperly functioning EGR system
  • Defective Mass Air Flow Sensor
  • Defective Crankshaft and/or Camshaft Sensor
  • Defective Throttle Position Sensor
  • Mechanical engine problems (i.e.-low compression, leaking head gasket(s), or valve problems
Common Misdiagnoses
  • Fuel Injectors
  • Oxygen Sensor(s)
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1 Answer

Wont start


is the your car engine cranking when you try to start, first check spark plugs ignition coils, remove one ignition coil and spark plug fix the spark plug in to the ignition coil then connect ignition coil to wiring and keep spark plug body touching on ground of engine head mettle parts, ask some one to crank engine then you can see is the plug sparking or not, do the same way to all the coils and plug otherwise you have to buy a ignition spark tester, is the all the coils and spark plugs are OK then check the fuel pump, it's sitting in under rear seat, before that do one thing disconnect oxygen (O2) sensor wiring and crank engine, the thing is if your oxygen sensor completely dead fuel pump will stop working, if engine start after disconnect O2 sensor, replace new O2 sensor, otherwise need to check fuel pump relay fuse and fuel pump. is this information helped you? please vote me and give a comment.

Oct 15, 2010 | 1998 BMW M3

1 Answer

2001 buick regal w/ bad ignition coil and clogged catylitic conv.


Hello! The defective ignition coil more than likely contaminated the downstream O2 sensor...If there isn't a trouble code and engine performs in a normal fashion, there's no reason to change the upstream sensor...

Guru........Saailer

Aug 03, 2010 | 2001 Buick Regal

2 Answers

Is the o2 sensor and the coil pack the same?


No, the o2 sensor and coil pack are not the same. The o2, or oxygen sensor, is mounted in the engine exhaust and produces a signal that the cars engine computer uses to calculate how much fuel to give to the engine. The coil pack is an ignition system part, it is what provides the voltage to make the spark plugs fire.

Jun 26, 2009 | 2001 Hyundai Santa Fe

4 Answers

I have a 2001 Santa Fe and the Engine light is lit and has been for many years. When I took the vehicle for the State Inspection I was told that the Co2 needed to be changed so the light would come off and...


The best thing to do is go to Auto Zone and get your Hyundai scanned for a DTC code. That would tell us which O2 sensor has gone bad. You have three O2 sensors and one of them has gone bad, the O2 sensor sends signals to the ecm to control the air fuel mixture so it will not run to rich or to lean which is causing you to fail the state inspection. Good luck and keep me posted on what the DTC codes are, be glad to help.

Jun 25, 2009 | 2001 Hyundai Santa Fe

1 Answer

Engine seems to bog out and lose hp


YOU MAY HAVE CATALYTIC CONVERTERS GONING BAD HAVE THEM TESTED

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