Question about 2001 Ford Windstar

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#3spark plug misfire

Have chng sparkplu and wires including coilpak engine lite stays on and sometimes blinks

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You may have missfire at 3th cylinder that related with fuel side of cylinder. Check fuel pressure and injectors. And if you had disconnect the battery may need remap or flash your ecu with proper tool.

Posted on Dec 07, 2012

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Posted on Jan 02, 2017

dsacco86
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SOURCE: new plugs an wires,coilpak what else could

This is the only possible ideas I can thing of :

Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

I know you did these two things:
Faulty spark plugs
Faulty coil or related wiring

Posted on Apr 14, 2009

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I have a misfire # 4 cylinder on a 97 Nisson Altima 2.4. Did complete tune up, has spark, good compression, swap #1 and #4 injector, problem stayed at #4, p0304. I read that intake could cause this but...


Did you check the coil pack to that cylinder? The best way I know how to check an individual cylinder getting fire is by using a induction timing light tester..start the engine then clamp the tester over the plug wire and point at a surface that will clearly show the flash of the light when the wire has power going to the plug..if you see an intermittent flash it is the coilpak...give it a try..a good luck..

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95 toyota t100 3.4L extended cab check engine light


Hello, this engine has 3 ignition coils on the passenger side cylinder head, each coil fires two spark plugs, the spark plugs on thew other side have plug wires connected to one of the coils on the other side, the #6 cylinder wire connects to the #3 coil, try replacing the spark plug wires

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After changing plugs wires and coilpak #3 plug has misfire


Would think you may have replaced the wires on
the wrong plug

Have to mark both ends of wires with a ball point,
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cap, before your start

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Engine misfires, particularly when trying to accelerate


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I have a 2003 trailblazer 4.2L Vortec, in line 6 with 250,000 miles. It started running rough with power loss. The code reader showed a misfire in clinder 2. Replaced the coilpak with no luck. The reader...


P0300 - Random/Multiple Cylinder Misfire Detected

Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.

A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

Symptoms may include:
* the engine may be harder to start
* the engine may stumble / stumble, and/or hesitate
* other symptoms may also be present

Causes: A code P0300 may mean that one or more of the following has happened:
* Faulty spark plugs or wires
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector(s)
* Burned exhaust valve
* Faulty catalytic converter(s)
* Stuck/blocked EGR valve / passages
* Faulty camshaft position sensor
* 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.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.


About the your previous code (P0301), this code will trigger the check engine light as follows:

The misfire detection monitor, a software strategy built into the computer, is designed to detect an engine misfire. The computer can also normally identify the specific cylinder in which the misfire has occurred. A misfire is nothing more than a lack of combustion, which can be caused by poor fuel quality or metering, low compression, lack of spark or unmetered air entering the engine. There are other possible, less obvious causes as well, such as uncommanded Exhaust Gas Recirculatin (EGR), flow. When the misfire monitor detects a misfire, it will trigger the check engine light with the specific cylinder number as the last digit in the P030X code. For instance cylinder 1 misfire is P0301, cylinder 2 is P0302 etc.

Possible Causes:
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports.
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

Diagnostic Help:
Begin by checking for proper fuel and ignition system operation, and then follow up with the less likely causes listed above, such as EGR and EVAP system problems. New style coil on plug applications have a high failure rate, and can be concluded faulty by swapping to another cylinder and checking to see if the misfire moves to that cylinder. This is a quick check if a capable scan tool or oscilloscope is not available. Always make sure the basic maintenance is done first and that things such as the fuel filter, air filter, spark plugs and spark plug wires are in good working order, as these are all possible candidates for a problem. If necessary, check for wiring and component concerns. See our article "Automotive Circuit Testing 101", if you need more assistance with this. If concern is determined to be intermittent, check out our article on intermittent diagnosis and wiggle test connectors and wiring, attempting to duplicate concern. You may also use the "Get Help" link if you need specifications or have any other related questions. Remember to refer to an appropriate manual for specific instruction.


Keep us updated.

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Getting a code P0304 on my 1999 Dodge 1500 5.2L.I changed my spark plugs, wires, cap and rotor about 3-4 mos. ago and have had my check engine lite come on three different times and stay on for 3-4 days at...


the code that is given means that the coil, plug ,plug wires, for that cylinder could be bad, check spark plug and see if this is the problem or a bad wire.

Nov 14, 2009 | Dodge Pickup Cars & Trucks

1 Answer

New plugs an wires,coilpak what else could


This is the only possible ideas I can thing of :

Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

I know you did these two things:
Faulty spark plugs
Faulty coil or related wiring

Apr 14, 2009 | 1998 Ford F150 Regular Cab

1 Answer

Check engine light on


When the check engine light flashes this is a class a misfire. If this is a 1999 you have a spark plug or a spark plug wire bad. Get a tune up done and replace plug wires.

Aug 14, 2008 | 1999 Ford Crown Victoria

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