Question about 2004 Ford Freestar

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On a 2004 ford freestar Van 3.9L I have 1 fuel injector bad. How can I test the fuel injectors to see which one is bad.

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  • ambo1024 Sep 12, 2010

    I was told by a mechanic it was a fuel injector. If not, what could be making my van miss at the 55-60 mph rate? No light comes on at all. It has done this for a few months since I got the tune up. It does not miss at any other speed. I am just clueless. No one will do anything unless the light is on and I can fix it myself if I knew what the problem was. it also does this in the rain or no rain doesn't matter. It's almost like a jerking feeling when driving at 60mph.

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  • Ford Master
  • 7,772 Answers

Disconnect the connectors one at a time with the car running. If there is no change in the rpm when you disconnect, the injector is not working.

Posted on Sep 12, 2010

  • 1 more comment 
  • ambo1024 Sep 12, 2010

    The ford freestar has intermittent missing at 55 to 60mph only.

  • Jeff Turcotte
    Jeff Turcotte Sep 12, 2010

    OK, that's harder, but is it not turning the engine light on? The computer should see the miss and should know which cylinder it is. How do you know it's caused by one of the injectors?

  • Jeff Turcotte
    Jeff Turcotte Sep 12, 2010

    Yes, very frustrating indeed. Sounds more like an electrical problem to me. And it runs fine at 65? Can you make it happen at the same RPM but a lower gear? If yes, maybe it can be isolated in the garage...I'm thinking ignition modulator or pickup coil, but I'm not familiar with your ignition system. The key here is to make it happen in a more convenient setting so we can try different things WHILE it's happening.

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2004 ford freestar 3.9lcode po305.replaced plugs wires coil and egr .still has code po305


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I have a 2004 ford freestar 3.9 The engine light started blinking and the engine was misfiring. The computer put out a code that cylinder 1 was misfiring. i have replaced the plugs and wires but still...


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.
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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.

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book time for a tech is about two hours but should be quicker with lots of practice

double that if you have not done one before

this might help you...a279b1b.jpg

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