Question about 2003 Ford Focus

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Misfire cylinder 3

I have a cylinder misfire and when i opened the hood while the car was running i noticed the exhaust manifold and sprk plug wire for cylinder producing spark. what would cause that

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Wire is burned by the exhaust manifold and is arcing

Posted on Jan 02, 2014

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 69 Answers

SOURCE: P0304=misfire in cylinder 4. coil?

not coil coil it wouldnt fire at all it is either a plug or a wire replace the wire and plugs and that will fix it

Posted on Oct 06, 2008

StormStrikes
  • 104 Answers

SOURCE: 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.

Posted on Dec 31, 2008

  • 1 Answer

SOURCE: Have a 2003 Taurus, 3.0 engine that has a misfire

did you check the injector pulse on that cylinder and it also could be the pcm , i had a taurus and a sable with good coils stop firing 2 cylinders and it was the pcm ,the code it gave was secondary coil but changed the pcm and it worked fine

Posted on Aug 29, 2009

  • 432 Answers

SOURCE: p0303 cylinder three misfire

Running out of gas causes the scum in the bottom of your gas tank to be fed to you engine. I replace the fuel filter every 30000 miles.You might have allowed scum into one of you injectors. Try replaceing that spark plug first.Dont run out of gas.

Posted on Sep 02, 2009

ministock48
  • 258 Answers

SOURCE: Ignition coil pack on Ranger 1999 misfire on #3

replace coil

Posted on Oct 23, 2009

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04 DODGE Ram hemi cylinder 3 misfire


Check engine compression and compare. then test running engine compression most engines have about 130-170 cranking compression and about 90-110 running compression. OR bring that cylinder to its Top Dead Center compression stroke apply air to the cylinder and check to see where the air is going open throttle plate bad intake valve, from exhaust pipe bad exhaust valve, from oil cap piston rings.

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Code p1537 comes up and misfire cyl.3 what can i do to repair the problem


DTC P1537 - Intake Manifold Runner Control IMRC maltfunction (Bank #1 stuck open)
Look down in the very back of the engine behind the intake manifold. You will see 2 linkages coming out of a box looking piece that has an electrical connection. Look at where the linkages hook up and see if the little white clips are broken or missing. This is typical. If all that looks ok, you may need the actual IMRC control--(Intake Manifold Runner Control); $150-200 range.

This it's located behind the upper intake manifold; actually bolted to the lower intake back by the firewall, it's not real easy to see. I would look at your vacuum lines on the intake manifold. I think it would be vacuum operated but I may be wrong. Anything on the manifold would be easy to fix and worth your time


DTC P0303 - Cylinder #3 Misfire
A code P0303 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.


Hope this helps.

May 03, 2011 | 1998 Ford Windstar

3 Answers

Hello my mustang is sputtering badly, idles at between 900 and 1000 rpm. has a bad exhaust smell and acts like it wants to stall alot. the oem codes it gave were po303 and po316. what does this mean and...


303= cylinder #3 misfire the 316 is just another code for misfire detected during start up:
I would say buy a new plugs and wires, this will correct the problem, Tim

  • 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

Apr 25, 2011 | 2002 Ford Mustang

1 Answer

Chevy S10 Stumbles really bad until temp gauge gets to 160 or more, error code said cylinder 3 misfire, Where do I start looking for solutions?


get u a heat gun and check ur temp on the exhaust manifold while truck is running bellow each plug the one misfiring will be considerably cooler then others,theres ur misfire

Oct 17, 2009 | 1991 Chevrolet S-10

1 Answer

Code 301, random or cylinder 1 misfire


Spake pluge could have gone bad, or the Spark Plug wire. Try changing all your plugs and wire and inspect the old one's. The wire could be bad do to time or may have been against the exhaust manifold and brunt. Good luck

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