Question about 2003 Ford Mustang

1 Answer

My 2003 mustang has a misfire code P0302 and runs rough under load.

I have changed plugs and wires and checked the fuel injectors. I did find that my car leaks coolant from the water pump gasket which drips on to crank shaft sensor. Would this cause engine to misfire?

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  • paul segovia Feb 13, 2012

    I have switched the coil and still same. I will check compression and see if this can lead me to problem. will post later

  • JaiScaife Jun 08, 2013

    Hi, I'm having the same issue with my 2003. Have you found a solution? Thanks in advance.

  • paul segovia Jul 25, 2013

    I still have not found solution. Sorry

  • Jerry Shockley
    Jerry Shockley Jan 04, 2014

    yes that will cause the problem. you'll most likely have to replace the intake on it then replace the plugs and coil pack on the number 5 cylinder

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  • Ford Master
  • 5,370 Answers

For engine misfiring problem check the help links mentioned below. Click the link below to go through the troubleshooting procedure :---- OBD-II Trouble Code P0300? http://schematicsdiagram.blogspot.com/2011/12/obd-ii-trouble-code-p0300.html
---------- Engine misses and truck jumps? Hard to down shift? Issue with high gear only? http://technoanswers.blogspot.in/2012/02/engine-miss-and-truck-jumps-hard-to.html

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Bad miss at idle?

http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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Engine Misfire codes for car?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
Engine Misfire codes?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html

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Misfire on cylinder 4?

http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html

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Oil on spark plugs and car misfires?

http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html

----------

This will help.

Thanks.

Posted on Feb 19, 2012

6 Suggested Answers

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Posted on Jan 02, 2017

  • 131 Answers

SOURCE: rough run,misfire #7 cyl. replaced coil pack

have you had the compression checked across the cylinders? **** sqeeze bang blow

Posted on Feb 25, 2010

  • 1 Answer

SOURCE: 3.8 liter ford mustang idles rough, runs ok at 70

is there any ways to test the coil pack,to make sure is bad.
does anyone had a schematict of it.

Posted on Jun 28, 2010

1fastbob
  • 301 Answers

SOURCE: my 2002 mustang GT hasits a misfire on cylinder 3

Clean the mass air flow sensor.

Posted on Nov 01, 2009

  • 16 Answers

SOURCE: My 2000 Ford Focus SE is throwing a P0302 code for

Ignition coil is most likely..clogged injector is uncommon but possible..fuel injector cleaner can only do so much..coil would be the thing to start with..

Posted on Sep 26, 2010

  • 14585 Answers

SOURCE: I have a 2003 Expedition

Most likely the coils. Easiest way to check is swap them with another cylinder, start it, pull the plug wire connecter and if it doesn't change the engine the coil is bad. If it is the injector, then you can check it with an ohm meter. Touch the leads in the injector it should read 11 to 15 ohms. if you need help let me know.
Randy

Posted on Dec 02, 2010

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2 Answers

2003 mustang cylinder 2 misfire. I changed the spark plugs and wires. Its still have code p0302. What should I do next?


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

Possible Solutions:
* If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
* If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

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Most likely the coils. Easiest way to check is swap them with another cylinder, start it, pull the plug wire connecter and if it doesn't change the engine the coil is bad. If it is the injector, then you can check it with an ohm meter. Touch the leads in the injector it should read 11 to 15 ohms. if you need help let me know.
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this right banks and left bank, please remove Ignition coils with lids and spark plugs from right bank and swap with left bank, if fault code change as
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