Question about 2006 Ford Freestar

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HOW TO FIX P0303 CODE FOR FORD FREESTAR?

MISFIRING AND SLUGGISH

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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Anonymous

  • 2 Answers

SOURCE: 2000 ford winstar sel update to problem

i had asimiliar misfire on my 2000 windstar.the first thing to check is a broken valve spring by taking off the valve cover the other is a o2 sensor bank 2 i believe is the downstream.if not the valve spring then either the coil pack or thecontrol module. either way it is fairly inexspensive

Posted on Mar 08, 2009

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Anonymous

  • 38 Answers

SOURCE: error code p0303 cylinder 3

A P0303 code – The #3 cylinder is in question. The computer has noticed that one of the cylinders is firing improperly.

Symptoms may include:

  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present
Poss. Causes:
A code P0303 may mean that one or more of the following has occurred:
  1. Faulty spark plug or wire
  2. Faulty coil (pack)
  3. Faulty oxygen sensor(s)
  4. Faulty fuel injector
  5. Burned exhaust valve
  6. Faulty catalytic converter(s)
  7. Running out of fuel
  8. Poor compression
  9. Defective computer
Poss. Solution(s):
If you are not having any of the above problems, then I would recommend resetting the code and see if it comes back.
If you experience / notice the engine is stumbling or hesitating, check the condition of the Spark Plug wires and boots. 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. Another possibility could be faulty fuel injectors..

Good luck. I hope this helps.

Posted on Apr 07, 2009

Bruce Hathcock

  • 3600 Answers

SOURCE: cylinder three misfire?

coil pack, or plug or plug wire.

Posted on Jul 09, 2009

jturcotte

Jeffrey Turcotte

  • 8980 Answers

SOURCE: i have a 2004 ford freestar 3.9 The engine light

Hi, the first step I recommend is to check for spark. You can do this by starting the car and then carefully pulling up the boot to the #1 ignition wire at the coil. If sparks are jumping inside the boot, you have spark and the ignition system is working.
jturcotte_504.jpg
1. Ignition: If there is no spark, shut of the engine and use an ohmmeter to check the impedance of the coil. Take the boot off, and connect your ohmmeter from the coil terminal to the engine ground. The resistance should be around 10-20 kohms. If not, replace the coil. If yes, the problem is the ignition module under the coil.

Now, assuming you have spark (which I believe you do, because the coil runs 2 cylinders, and you only have one cylinder that is misfiring), the problem will be a lack of compression or a bad injector (or possibly the injector wiring).

Note: I will provide repair steps once the troubleshooting is complete and the problem identified.
Also, if you do not have a multimeter, you can get one for $10-20 at radio shack or even Walmart. It will save you money overall--or maybe you have a friend that you could borrow a meter from.

2. Injector: The next easiest test to run is to see if the injector solenoid is clicking. You can do this by holding a long screwdriver to the injector and hold the other end of the screwdriver to your ear. With the engine running, you should hear the injector clicking. If not, you have a bad injector or a wiring problem. To determine whether the problem is the injector or the wiring, pull the connector off the injector and measure the AC voltage in the connector with the engine running. The voltage should be 1-2 volts or similar to that voltage of any other injector connector.
If the voltage is good, but the injector is not clicking, replace the injector.

3. Valves/compression: the last possible reason for a misfire is a lack of compression. The intake valve must open to accept a fuel/air charge, and both valves must be closed for the cylinder to fire. Sometimes an exhaust valve will burn and not hold compression. A blown head gasket can also cause this problem. The test we use to check the valves is a compression test. You can borrow or purchase a compression tester if you get to this point. Remove a few of the spark plugs including the cylinder that is misfiring. Screw the compression tester into the spark plug hole and crank the engine for a few revolutions. Record the pressure on the gauge, release the pressure, and go on to the next cylinder. If the pressure is much lower on any cylinder as compared to the highest cylinder, the cylinder head will have to be removed to correct the issue.

Please let me know the results of your troubleshooting and feel free to ask questions as you go.

Posted on May 20, 2011

barry corrin

  • 510 Answers

SOURCE: I have a code p0303

Three sensors need checking/replacing
MAF sensor(mass airflow sensor)
ECM (engine control module)
ECT (engine coolant temp sensor)
Engine control module sounds good

Posted on Aug 08, 2011

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