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2003 FORD FOCUS. WHEN ENGINE IS WARM , STEP ON GAS AND CAR JERKS AND SPUTTERS NO POWER. CHANGED PLUGS AND WIRES. ONLY MISFIRE CODES. WHEN FIRST START IN MORNING RUNS GOOD T FIRST

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Well.. I have the exact same problem and I am still trying to figure out what is causing it. So far I've tried: new spark plugs, fuel injectors, cam/crank sensors, ignition control module (I think.. my brother did the work). If you figure it out before you get rid of the hunk of junk let me know. I like not having a car payment and the gas mileage is better than my Jeep. =] btw - I will never buy a Ford again, while dealing with the herky jerky problem. I have also had the following go wrong: ignition wouldnt turn, clutch went out, and the trunk latch is on the fritz.

Posted on Jan 26, 2011

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My 1996 Taurus when I press the gas pedal when cold it sputters and lacks power. When it warms up it runs great.


Possible causes - Faulty spark plug 5
- Clogged or faulty fuel injector 5
- Faulty ignition coil 5
- Fuel injector 5 harness is open or shorted
- Fuel injector 5 circuit poor electrical connection
- Ignition coil 5 harness is open or shorted
- Ignition coil 5 circuit poor electrical connection
- Insufficient cylinder 5 compression
- Incorrect fuel pressure
- Intake air leak

The P0305 code means that the cylinder 5 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 5. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes



When is the code detected? Engine Cylinder 5 is Misfiring.


When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.



Oct 21, 2014 | 1996 Ford Taurus

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I have a 2003 ford focus , I am having a misfiring problem. I have replaced spark plugs, wire, coil pack, air filter, fuel pressure sensor, replaced injectors 3 and 4 in which that the misfiring code....


Check for Intake Manifold leaks with either a water mist from a spray bottle or Choke cleaner. Do this while the engine is running and you will know about a leak with an RPM change. I read about some intakes were 2 piece and the intermediate gasket leaks.

Also you could clean the MAF on the air intake with Electric cleaner. If you have an old fashion Vacuum gauge you could plug in and see how steady Valves are closing by watching the Vacuum bounce from misfires.

Would like to know results on this case.

Nov 03, 2010 | 2000 Ford Focus

1 Answer

2003 Expedition engine light flashes on/off when eccellerating took to Auto zone, code was P0301, changed out plug and COP still doing smaething. It sputters when accelerating. What wrong with it?


First, are you certain you changed the plug for number 1? If so, check the power connection to the COP. If it is dirty or loose that can cause a misfire also.

Sep 14, 2010 | 2003 Ford Expedition

1 Answer

2003 ford f 150 4.6 v8 and the idle went from smooth to rough also sputters and sluggish while driving check engine light is flashing.


have the vehicle scanned for error codes at autozone, its free. Post codes for more help....These engines have issues with the COPs (ignition coils-over-plugs) failing prior to 80k miles. When they fail typical problems are: Sputtering under load/acceleration, rough idle, random misfires, random stalling, light or heavy jerking under load (usually at 15-35mph and 45-65mph)..hopefully this helps!!

Apr 28, 2010 | 2003 Ford F150 Regular Cab

2 Answers

Car jerks while taking off; changed fuel filter


get a scan tool to retrieve the dtc (diagnostic trouble code).
you will get a misfire code.
p0301 for cyl 1
p0302 for cyl 2 and so on.
i can't recall if that engine has plug wires or coil on plug but if its coil on plug replace the coil corresponding to the cylinder misfire

Jan 12, 2010 | 2003 Hyundai Tiburon

1 Answer

2005 Ford Taurus Sputtering


stickingvalves collapsed lifters bent push rods fault ignition or damadged spark plug wires start it up at night look under the hood for sparks jumping from wires replace fauilty wires

Jun 22, 2009 | 2000 Ford Focus

1 Answer

Engine stalls and accelerates


check the idle air control motor

Apr 17, 2009 | 2003 Ford Focus

1 Answer

Engine sputtering


how long has it been since the air filter and fuel filter been changed ,oxygen sensor in good shape ,if its running rich from misfiring you will ruin the catalytic converter in a short time check for vacuum leaks if its only no 1 cylinder then focus there maybe bad injector only sure way to tell is inspect spark plugs they should look brownish gray color and dry

Mar 29, 2009 | 1998 Ford Windstar

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