Question about 2005 Ford Ranger

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Misfire 2003 ranger with2.3 i have po301 changed plugs,wires, injector, swapped coil pack .checked for vacum leaks,none found still have misfire.

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  • chrisblouin0 Mar 16, 2009

    my 05 ranger 3.0 is misfiring i changed plugs,wires,coil,and crankshaft sensor and it still aint the problem

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Check your cam. position sensor

Posted on Jul 25, 2009


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1 Answer

P0303 cylinder 3 misfire


If # 3 cylinder has spark at the plug it must fire if the following conditions apply. Injector is supplying fuel to the cylinder. and cylinder compression tests OK . So check above ,one or both must be at fault.

Jul 17, 2014 | 2003 Ford Ranger Regular Cab

1 Answer

Misfire coil


coil pack voltage may be good but coil may not be putting out voltage check with spark checker.also fuel injector may be bad if all good do compresson test on cyl

Apr 16, 2014 | 1998 Ford Expedition

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Fuel system control open at 4000 rpm


p0306?
misfire means, low combustion energy on #6
  1. bad spark,
  2. bad injection,
  3. bad compression
there are tests for each one.

i always check compression first. that why i dont spend a fortune
guessing. 30min.,labor , done wide open throttle, 150psi min.

i also heck the fuel pressure doing the SOP leak down test. (fSm)
then the injector balance test at same time.
finds leaking injector and clogged.
got cops?
you could have swapped coil packs COPs to see if that cured mifire.
swap any other with #6
if problem follows the coil pack COPS, then its bad.
my v6 had a 3 coil pack and cant swap just one coil. all 3 or none.

the misfire is real. you can feel it and the PCM measures it.

Apr 06, 2014 | 2005 Jeep Grand Cherokee

2 Answers

I have a 1996 crown vic i need to know these trouble codes po301 po304


PO300 Codes-- are cylinder misfires

PO301 thru PO308

Last # is the cylinder

Could be bad ignition coil for a cylinder
or a coil pack for that side,depending what
engine you have

#1 &#4 are at the front & back of the passenger
side of your motor or firewall side if transverse

You will need to provide details of who worked on it
& exactly what was done besides replace a coil based
on a code

Codes aren't very good with COP Ignition but a complete
coil pack on one side should take care of some issue

Vacuum Leaks & other items can cause misfires & the codes
don't tell you to replace ignition parts as you may have

Feb 14, 2013 | 1996 Ford Crown Victoria

1 Answer

1999 mercury mystique cylinder 2 misfire ! Changed gasket, plugs, wires, and coil pack and problem still exist !!! Please help !!!


Okay kevin, the first thing is to make sure there is no vacuum leak, start the car and look and listen around for a hissing sound.if no leak is found then we will move on to the next test which would be a compression test, this test will tell you if the cylinder has compression and will help with the next step. seeing that you replaced the plugs wires and coil pack, if you have good compression then the injector would be the next step. check the connector on injector, if all looks good then the next step would be to swap injectors from that # 2 cylinder with #4 and then drive the car and if light comes back have it scanned and see if the misfire moved to cylinder #4. if it did move then you will be sure it is the injector. do compression test first , test all cylinders, make sure to have all plugs out and unplug coil pack connector when doing compression test. write me back with the results. good day

Nov 12, 2012 | Cars & Trucks

1 Answer

2003 Hyundai Sonata with 4 cyl. PO301 error code. Have replaced spark plugs, wires, coil packs, and mass air flow sensor. Replaced air filter due to heavy gas smell. Car was starting after tapping gas 3...


P0301 - Cylinder 1 Misfire Detected.

Possible Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak at cylinder

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

Being you have a heavy gas smell I would look into the injectors. If injector #1 is over producing it can cause a misfire. Test your compression and fuel pressure.

Jan 17, 2011 | Hyundai Sonata Cars & Trucks

1 Answer

PO301 code on Hyundai Sonata. Replaced wires, plugs, coil packs, and mass air flow sensor.


P0301 - Cylinder 1 Misfire Detected.


Possible Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak at cylinder


Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

Jan 17, 2011 | Hyundai Motor 2003 Sonata

1 Answer

Car passes emmission test but fails due to codes in computer


ok code 0300 is a random multiple cylinder misfire. probably ignition related is my guess. i would check the coil pack and ignition module and go from there.

Mar 16, 2009 | 1996 Chevrolet Cavalier

2 Answers

Engine misfires


You didnt mention having changed the spark plug wires, so that is another item that could be culprit as well. As well, it could be a coil pack that is not working properly.

I cannot recall at the moment if that model year uses coil on plugs or if it uses coil packs. Either way, if it uses a coil on plug set up, take the one for the #3 cylinder and move it to say #4 or anyone of your choice and see if the misfire follows

If it uses coil packs, there is likely one coil pack that controls two cylinders. In that case just swap the coil pack with an adjacent one and see if the problem follows. Pay attention to where the spark plug wires go because it will be an issue if you get them mixed up. You just swap the coil packs around.

I would, however, start with the spark plug wires if you have not changed them already.

Dec 31, 2008 | 2003 Ford Explorer

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