Question about Ford Expedition

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Car shaking when accelerates took it to have mechanic hook it up to a machine said it might be the oxygen sensor defect? or fuel injector problem?? where is it located at he told me under the hood on top of the engine to the back of the car

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Oxygen sensor is in the exhaust (depending on year & engine there is multiple 02 sensors) And injectors, there are 1 per cylinder.

Posted on Mar 17, 2011

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Rough idle in drive, correct rpm


Car idle is rough Inspection Service & Cost A rough idling engine can be caused by a number of issues, some of them are serious while others tend to be minor, but the symptoms remain pretty much the same. The car will feel rough and bouncy when the engine is running. The car will also idle below its regular speed, display inconsistent RPMs and may produce a shaking, skipping or slipping sound when the vehicle is running.
While a rough idling engine may seem to be a simple inconvenience it often indicates a deeper problem within the engine. The vehicle should be inspected and repaired as soon as possible because small problems have a way of turning into expensive repairs. How this system works: The idle speed of an engine is basically the rotational speed the engine runs on when it is un-coupled from the drivetrain and the throttle pedal is not being depressed. The idle speed is measured in the revolutions per minute of the crankshaft.
When an engine is running at idle speed it generates enough power to smoothly operate equipment such as the water pump, alternator, and power steering but not enough power to move the vehicle itself. A passenger car will usually idle between 600 RPMs and 1000 RPMs. A properly functioning idle should run smoothly without skipping or slipping. Common reasons for this to happen:
  • Dirty Fuel Injectors: The fuel injection system injects fuel into the cylinders, which creates a mix of air, and fuel to ignite and burn. Fuel injectors have tiny nozzles to spray the fuel into the cylinder and they can become clogged over time. clogged or failing fuel injector creates a lack of fuel in the vehicle's engine. This can cause a rough idle, it can also cause symptoms such as slow acceleration or the car not feeling as if it has enough power. If the problem is addressed early, it is possible to clean the injectors, which will restore them to full function. If this condition is not addressed in a timely manner the injectors will need to be replaced. Incorrect Idle Speed: While the average idle speed falls between 600 to 1,000 RPMs, if your vehicle is experiencing a rough idle it could be due to an incorrect idle speed setting. A trained mechanic can easily adjust the idle speed, and it should stay at the proper speed. If an adjusted idle speed becomes inconsistent or changes at random intervals there may be a bigger problem that needs to be explored. Vacuum Leak: If the vacuum system has a leak, it can seriously affect the ability of the vehicle's computer to regulate the air to fuel ratio. This can lead to a rough idle and if the problem is not addressed the car may experience slow acceleration and a lack of power. Vacuum leaks should be inspected and repaired immediately. Incorrectly Installed or Damaged Plugs: Spark plugs are responsible for creating the spark that allows the vehicle to burn fuel. If spark plugs are improperly installed or malfunctioning, the idle speed can be affected. The vehicle's engine may vibrate or there may be slipping or straining sounds coming from the engine. Defective or Clogged Fuel Pump: A rough idle can be related to fuel delivery issues. The fuel pump, which is responsible for pulling fuel from the gas tank to the fuel injectors, can become clogged or defective. If this happens the engine will not get enough fuel, which can cause a rough idle, sputtering, stalling and even slow acceleration. Clogged Fuel Filter: A clogged fuel filter can cause similar problems. The job of the fuel filter is to screen out contaminants in the fuel, over time it will become clogged and need to be replaced. A rough idle is one symptom of a clogged fuel filter. Failing Electrical Components: A problem or failure in the ignition system or various electronic components can cause a rough idle. If this is the case, the problem will usually get worse as RPMs increase. Common culprits include the ignition control module, plug wires, coils, and spark plugs. Defective Airflow Sensor: A defective airflow sensor can be responsible for a rough idle. A mass airflow sensor detects the amount of air coming into the fuel injection system and sends that information to the vehicle's computer. The computer uses that data to deliver the proper amount of fuel to the air in the vehicle. Over time these sensors can malfunction or become dirty. One of the first symptoms of a malfunctioning airflow sensor is a rough idle. The car may also accelerate slowly and even stutter or stall as the problem progresses. Dirty Oxygen Sensor: Oxygen sensors measure how rich or lean the gases are as they exit the combustion chamber. Depending on the results, the amount of fuel entering the engine is adjusted by the vehicle computer. The ultimate goal is to maintain an ideal mixture that produces the lowest emissions. A dirty or failing oxygen sensor will usually trigger the check engine light and can lead to a rough idle, lower fuel efficiency and failed emission test.

Sep 28, 2016 | AC Cars & Trucks

1 Answer

My daewoo lanos 1999 model can start and drive it has no power if you try to accelaret the car then cut off or just reduce the speed whats the problem


Walter: The most common cause of acceleration issues lies in the transmission. However, 2CarPros.com suggests:
Inspect and test all the following:

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

May 25, 2015 | 1999 Daewoo Lanos

1 Answer

What are codes p1401 p0302 p0305 p1409 p0301


P1401 Differential Press Feedback EGR Circuit High Input
Your EGR port is plugged. Replace your EGR valve, and clean the ports
A code P0302 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
  • A code P0305 may mean that one or more of the following has happened:
    • Faulty spark plug or wire
    • Faulty coil (pack)
    • Faulty oxygen sensor(s)
    • Faulty fuel injector
    • Burned exhaust valve
    • Faulty catalytic converter(s)
    • Running out of fuel
    • Poor compression
    • Defective computer
    • A code P0301 may mean that one or more of the following has happened:
      • Faulty spark plug or wire
      • Faulty coil (pack)
      • Faulty oxygen sensor(s)
      • Faulty fuel injector
      • Burned exhaust valve
      • Faulty catalytic converter(s)
      • Running out of fuel
      • Poor compression
      • Defective computer
      • A code P0302 may mean that one or more of the following has happened:
        • Faulty spark plug or wire
        • Faulty coil (pack)
        • Faulty oxygen sensor(s)
        • Faulty fuel injector
        • Burned exhaust valve
        • Faulty catalytic converter(s)
        • Running out of fuel
        • Poor compression
        • Defective computer
        • p1409
        • EGR Vacuum System Leak - Read Our Article on EGR Valve Codes For Help With This Oldsmobile Check Engine Light Code

Sep 25, 2014 | Cars & Trucks

1 Answer

My 2006 chevy aveo displaying check engine light. error code is po 420 "catalyst system efficiency is below threshhold". i took it to my local mechanic and he changed the electric coil wiring....


Oh My God. Talk to an honest mechanic! You probably have a bad oxygen sensor. It will cost you about $45 dollars for a new one. You can change it yourself. It is the oxygen sensor that is located just to the rear of the catalytic converter. replace it and have the codes cleared at an auto parts store. If the code comes back, then you may need to replace the oxygen sensor that is on the engine exhaust. An auto parts store can look at the voltage of each oxygen sensor and tell you which one is bad. Each oxygen sensor should be bouncing around on the voltage and should frequently be at around .7 volts. If one of them is at .1 or .2 volts, that is the bad one. Buy that one and replace it. Very simple. DO NOT DO THE $1400 repair. That repair shop is trying to take you. Hope this helps.

Mar 19, 2017 | 2006 Chevrolet Aveo

1 Answer

I have just bought a 2001 Oldsmobile Alero. When I purchased it I found that it was shaking a little when in idle. I took it to a localAuto Zone and had then look at it and they said it was a misfire and...


did you change plug wires? try first,then try some fuel injector cleaner-LUCAS Brand if can get,if still the same- fuel filter ands air cleaner are next on list...

May 06, 2011 | Oldsmobile Alero Cars & Trucks

2 Answers

My truck is showing codes 171 and 174. Can you help


P0174 Generic Definition

Fuel Trim Bank Two Condition
- The ECM has detected a rich or lean air/fuel ratio condition on engine bank two

Probable Cause[s]

  1. If bank one and two are set together suspect a fuel pressure condition or MAF sensor fault
  2. Failed HO2S21
  3. Ignition misfire condition
  4. Fuel injector problem
  5. Engine mechanical condition




    P0171 Generic Definition

    Fuel trim bank one condition
    - The powertrain control module uses the oxygen sensor to calculate the air/fuel ratio of the engine. The computer has recognized a rich or lean condition on one engine bank only.

    Probable Cause[s]

    1. If bank one and two codes set together suspect fuel pressure or MAF (Mass Air Flow) Sensor
    2. Oxygen sensor defective
    3. Ignition misfire-repair
    4. Fuel injector problem












      Mar 05, 2011 | 1999 Chevrolet Silverado 1500

      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)
      • Power Train/Drive Train problem

      Jan 05, 2011 | 1999 Chevrolet Suburban

      2 Answers

      After going over 40mph the check engine light goes on n it gives the code 440


      How did you read that code on your car? A 92 Accord is supposed to give you pre-OBD honda codes, which are all below 100. Please check the code again and re-post it.

      Jan 04, 2011 | 1992 Honda Accord

      2 Answers

      Engine / emission light and burned out alternator


      Oxygen sensor might be faulty, as it causes the light to come on, but injectors hardly causes the light to come on, alternator( battery) light is an indication that the alternator needs to be replaced.

      Nov 14, 2008 | 2005 Chrysler PT Cruiser

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