Question about 2001 Ford F250 Super Duty Super Cab

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I have a miss in two cylinders 1 and 7 i have changed the plugs the coil plug coil and injector still hane a miss dont no what to do next

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  • yadayada
    yadayada Jun 04, 2010

    what is the compression reading?

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I'm assuming you have spark and fuel.

Do a compression check on all cylinders, all should read the same.

Posted on Jun 04, 2010

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My 2006 ford fusion sel v6 is having cylinder misfiring problems the codes it reads out are p0171 p0304 p0305 p0306 and p0300


p0171 is fuel injection system too lean - bank 1
possible causes
- Intake air leaks - Faulty front heated oxygen sensor - Ignition misfiring - Faulty fuel injectors - Exhaust gas leaks - Incorrect fuel pressure - Lack of fuel - Faulty Mass Air Flow (MAF) sensor - Incorrect Positive Crankcase Ventilation (PCV) hose connection
p0304 is cylinder 4 misfire detected.
possible causes
Faulty spark plug 4 - Clogged or faulty fuel injector 4 - Faulty ignition coil 4 - Fuel injector 4 harness is open or shorted - Fuel injector 4 circuit poor electrical connection - Ignition coil 4 harness is open or shorted - Ignition coil 4 circuit poor electrical connection - Insufficient cylinder 4 compression - Incorrect fuel pressure - Intake air leak
p0305 is same as above but cylinder 5.
p0306 is same as above but cylinder 6.
p0300 is random misfire detected
possible cause
Faulty spark plug (s) - Faulty ignition coil (s) - Clogged or faulty fuel injector (s) - Intake air leak - Fuel injectors harness is open or shorted - Fuel Injectors circuit poor electrical connection - Ignition coils harness is open or shorted - Ignition coils circuit poor electrical connection - Insufficient cylinders compression - Incorrect fuel pressure

Oct 31, 2016 | 2006 Ford Fusion SEL

4 Answers

What do I do next? My 2001 olds alero 3.4l v6 is misfiring constantly. Scanned obd2 error code p0301. Already changed spark plug, wire, and coil for cylinders 1 and 4. Still have same problem.


I recommend checking all injectors and O rings on the injectors if an O ring cracks air can raise Cain with misses so can injectors another thing is cam to look at will cause a constant miss but only on 1 cylinder at a time but doubt its the cam. check injectors and O rings also pull 1 plug wire at a time with wire pliers while engine is running and find the 1 cylinder that is giving you the problem when you pull the plug wire that is missing the engine will smooth out then that cylinder is your problem wear rubber gloves with the plug wire pliers so you dont get bit let me know if i can help please rate my solution as this is how i earn my achievements on fixYa thanks.

May 22, 2014 | 2001 Oldsmobile Alero

1 Answer

02 mercury sable P0301 and P0316


You have a miss in the number 1 cylinder during the first 300 revolutions and then during the next 1000 rpm it is still missing. Depending on the engine type you can have a bad plug, plug wire, or coil if it has a coil on each plug. You can also check for the injector ground wire and connector for #1 plug.

Mar 10, 2014 | 2002 Mercury Sable

1 Answer

Miss fire at cylinder 6 on my 2004 grand am 3.4 i have replaced new plug new coil and wire whats next still miss fires


With the engine running and the cylinder misfiring tap (key word is tap) the injector with a screwdriver a couple of times. If the misfire goes away replace the injector.

Nov 29, 2012 | Cars & Trucks

1 Answer

Hi I have a 1999 1.8 ford focus its misfiring on cylinders 1


Remove the top cover on the valve cover concealing the coils. Remove and inspect the spark plugs, and replace as necessary. Start the engine and see if the miss has been eliminated. If the miss is still there, a problem could also exist in the wires or coil or even the fuel injector, which will all need to be addressed as the diagnosis progresses. A fuel injector will cause the same type of a miss if it sticks.

  • 2 Mist the spark plug wires, and watch for evidence of arcing to the cylinder head cover. This will indicate a bad wire. If this is visible, then replace the spark plug wires.
  • 3 Turn the engine off, and loosen the wires at the coil by giving them a twist and pulling them out of the coil. Leave them on the coils--you just want to loosen them a bit to make the next step easier.
  • 4 Start the engine. Using a pair of pliers with insulated handles, pull one plug wire out of the coil at a time and watch for a noticeable drop in engine RPM. The cylinder that has no drop or noticeable decline in RPM is the one causing the miss. Also when the wire is removed, watch for a good spark at the coil to the wire when the wire is held close to the coil. This could indicate a bad coil if the plug wire checks out fine.
  • 5 Check the suspect wire with the Ohm meter, and test for continuity through the wire. If there is continuity, the miss is still present and there is no spark to the wire when it is removed from the coil, replace the coil.
  • 6 Check the fuel injectors. If the plugs and wires are good and there is a spark at the coil to wire test, then checking the injectors is the next step. If this is fine, then a compression test should be done to locate an internal engine problem. Start the engine, and remove the electrical connectors to the fuel injectors one at a time and listen for a significant engine RPM drop. If one cylinder is found to make no difference or very little in comparison to the others, replace the injector.
  • Oct 19, 2011 | 2000 Ford Focus

    3 Answers

    My 2004 chevy trailblazer is missing badly. Had them read the code for me at auto zone and it said I had a miss fire on the number one cylinder. I changed the plugs and it is still missing badly


    Try moving the coil pack from cylinder 1 to another cylinder (swap locations) and see if the same code comes up. If code is different, then coil pack is bad. Other reasons for miss; bad injector, poor compression.
    Also, I know you changed plugs already, but always use AC Delco 43-103 plugs on this vehicle.

    Sep 11, 2011 | 2004 Chevrolet TrailBlazer

    1 Answer

    Code po300 have already change plugs,coils and intake gasket ran it still have code and miss fire, eemove plugs again plugs 1,2wet and 3 is damp what to do next


    This could be bad fuel injectors or bad compression. Take a compression test, if its good then try switching the injectors to different cylinders to see if those cylinders misfire

    Apr 22, 2011 | Chevrolet Cavalier Cars & Trucks

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    2002 Ford Tarus intermittant missing cyl #3 after tuneup


    I would remove one plug at a time, plug it back in wire and lay on top of engine block. Have some one crank and look for spark. Do this for each plug. If 1 is missing. You have bad wire. If two sparks are missing, then you have bad coil pack, if 3 is missing, you have two bad packs or bad module, if all cylinders are missing, then module or cranks sensor is faulty. Dont forge to change those plug wires just as often as plugs. They may look good still, but they get weak

    Sep 11, 2009 | 2002 Ford Taurus

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    Missing on #1 cylinder


    Your next step is to check the compression and fuel. You could have low compression or a bad fuel injector or a Burnt valve

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