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Lack of power, hesitation, #1 miss firing

New plugs, new wires,1 new coil, new injector, good voltage to injectors and compression is good on all cylinders. I switched things around and around to test parts but the same code #1 miss firing shows up. Have not checked fuel pressure because I don't know where and can't find info. Do you think this can be a fuel pressure problem.

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  • crosser38 Jul 27, 2009

    Please,explain leak down test? wires are good and compression is egual on all cylinders.
    thank you

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You may need to perform a leak down test to the cyliner and maybe you may have carbon on that valve. make sure the new spark plug wire has the correct continiuty

Posted on Jul 27, 2009

  • wdpettite Jul 27, 2009

    hello there is a tool called a leak down tester and this leak down tester will advise you if you have a leak with in the internal engine. when you have carbon build up in one of your valves in you cylinder head that will cause engine to misfire in that cylinder head. a compresure tester is good tool but you will need to follow up with a leak down tester to see if you loose any pressure. have you cleaned out your throttle body in the past.

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you don`t say how you verified that the plug and wire was good. I think these use coil on plug, if so check powers and grounds for that coil as one may have a problem.other things that could cause this is a bad fuel injector, poor compression due to either rings, valve, worn cam, damaged push rod,

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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.

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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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