Question about 2004 Ford F150

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Check engine light comes on. p0171 and p0351 codes found

Runs rough, shifts poorly, idles rough but doesnt stall...OBD II check found several trouble codes, including Ignition coil a primary circuit malfunction, misfire cylinder 1 at startup, lean system on bank 1. Already changed ignition coil on cylinder 1, didnt change plug though.

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  • rarenivas Dec 11, 2008

    I have code problems with my 150 code po172,po300,po304

  • Anonymous Mar 12, 2014

    runs good at startup . runs bad after about 30 sec or so

  • Anonymous Mar 14, 2014

    Truck idles ruff after it gets driven for a while then wants to stall when stopping at light

  • Anonymous Mar 22, 2014

    engine misfire on cylinder number 4

  • Anonymous Mar 23, 2014

    Hooked up to computer at auto parts store and read 92 sensor for #1 cylinder bad. Changed it and engine still shakes while idling and while driving. Engine seems to run fine though, did not change plugs yet. Thought they burn out when sensor was bad. Anyone have this problem that has answer to a fix? This on a 96 FORD EXPLORER XLT 4.OL engine.

  • Anonymous Mar 24, 2014

    lean bank 1

  • Anonymous Mar 26, 2014

    car idle rough and misfiring when driving,have tested coils with timing light and ok,replaced spark plugs,no change..ran some injector cleaner through and has improved a little but prob is still there,powertrain check is on ,any advice would be appreciated.

  • Anonymous Mar 29, 2014

    motor runs rough is there any other parts of the ignition system i should check or parts to replsce

  • Anonymous Mar 31, 2014

    stalls after warmed up, rough idle, engine code lean on left bank

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From Lusty Kid:

I know the economy is bad, but change all of the plugs. Check your PCV Valve hose, 150 rottens them out allowing air to be sucked in, thus all kinds of codes.

Depending on mileage. Dismount the EGR valve and clean passages. If you are really good dismount the throtle position sensor body and clean out passages with Choke Cleaner., dismount where the EGR valves connects to the engine, clean out passages. Also check the hose thats behind this mounting to ensure is not clogged. If clogged clean it out. If not replace it. Is about 1.5 ft. long, connects to the PCV Valve Hose.

When is the last time you change your harness. Can't remember??? Replace it. Good Luck

Posted on Dec 26, 2008

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P0351 - OBD-II Trouble Code

Auto Systems and Repair

Ignition Coil "A" Circuit Primary/Secondary Malfunction Our emissions expert has put together the following information about the P0351 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.
OBD II Fault Code
  • OBD II P0351 Ignition Coil "A" Circuit Primary/Secondary Malfunction
What does this mean? The ignition coil or coils are responsible for igniting the air/fuel mixture inside the combustion chambers. Without reliable performance from the ignition coil(s) the vehicle will stumble and misfire.
Code P0351 indicates there's an electrical problem in either the primary ( the computer side ) or the secondary ( the spark plug side ) of the Ignition Coil "A" Circuit.
Symptoms
  • Check Engine Light will illuminate
  • Engine idles rough
  • Engine misfires on acceleration
  • In rare cases, the engine may not exhibit noticeable symptoms
Common Problems That Trigger the P0351 Code
  • Defective Ignition Coil(s)
  • Defective Spark Plug(s)
  • Intake Manifold Vacuum leaks
  • Carbon buildup in the Throttle Body air passages
  • Defective Idle Air Control Valve or Electronic Body
Common Misdiagnosis
  • Ignition coil(s) replaced when cause of the malfunction was a vacuum leak
  • Spark Plugs replaced when cause of the malfunction was a vacuum leak

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Improve the FixYa experience for everyone by voting. I want you to let me know if the solution(s) suggested were of any value. Constructive criticism is welcomed.

Hi,

I'm Ben and -- hopefully -- I can provide some meaningful assistance.

In my opinion, the problem lies with you P0174 reading. I'll explain.

OBD II Fault Code

OBD II P0171
OBD II P0174

Fault Code Definition

OBD II P0171 Fuel System Too Lean (Bank 1)
OBD II P0174 Fuel System Too Lean (Bank 2)

Symptoms

  1. Check Engine Light will illuminate
  2. In some cases, no adverse conditions may be noticed by the driver
  3. In other cases, there may be performance problems, such as a lack of power on acceleration and some "coughing" or misfiring
  4. The vehicle may have trouble idling, especially when warm or when sitting at a stoplight

Common Problems That Trigger the P0171 and P0174 Code

  • PCM software needs to be updated
  • Vacuum leaks (Intake Manifold Gaskets, vacuum hoses, PCV hoses, etc.)
  • Mass Airflow Sensor (MAF)
  • Plugged Fuel Filter or weak Fuel Pump
  • Plugged or dirty Fuel Injectors

Jun 23, 2012 | Cars & Trucks

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