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Number 3 and 4 are not firing from coil on 2002 subaru outback 2.5

Number 3 and 4 are not firing from the coil would like to know if the coils are bad or if there might be another problem that could cause this

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  • Bobby Poirier
    Bobby Poirier Jan 21, 2014

    It could be the crankshaft positioning sensor, or just bad spark-plug wires, or oil around the spark plug to wire connection making it arc.

  • Bobby Poirier
    Bobby Poirier Jan 21, 2014

    Spark-plug wires should not be run nice and neat next to each other or they will arc. You must cross them every little bit.and this keeps from misfiring. Also there is a knock sensor on top of most vehicles which complensates for low-octane fuels, you will have to review individual vehicle repair manuals for replacement and testing, and may be a fair sized job. OBDII testers are now available for $10 bucks on Ebay that work on your Android phone.

  • Bobby Poirier
    Bobby Poirier Jan 21, 2014

    you say not firing but how did you determine this. If you have spark from the plug but none beyond, check big ground to engine and body from battery, check spark plug of course, to test - remove plug and clip a ground wire to the metal of the plug and turn it over - do not turn over a vehicle without a ground to the plug or you probably will fry the ECM (Computer) Could be a head-gasket in between those two cylinders - to test: clean spark-plug surround so no dirt falls in (use vaccuum) and tools to loosen dirt, remove plug, (plug-wires with carbon in them are very fragile however if you break an end removing it from the spark plug it can be spliced back carefully with a little overhang of the center wire folded over the edge and the connector end crimped back on - no special tools needed really do compression test but should only take a quick whirl of the engine, one or 2 revolutions. Write down pressure, double check. then put pop bottle cap of oil in the cylinder and repeat compression test - if pressure goes up is bad rings, stays same is valve or head gasket between cylinders, if you continue driving on less than all cylinders you may damage engine, and antifreeze burning in an engine will wear holes in valves and head be severely damaged. This info is just for testing and elimination of symptoms to diagnose your problem.

  • Bobby Poirier
    Bobby Poirier Jan 21, 2014

    Cheap tools are available at Princess Auto in Canada but not certain where for those south of the border. But a cheap compression tester with 2 or 3 adapters to fit most vehicles can be had for 25.00 and an in-line tester (placed between the sparkplug wire end and the spark plug to determine if there is spark for about $10.00, every used car owner should have this as well as a cheap VO meter which testes ohms (resistance in a circuit or a dead-short (some meters will emit a beep if shorted or the wire is good.)) Voltage testers can range from a simple 12 volt light. With these tools and the Code Scanner OBD and OBDII testers are now available on Ebay for only $10 bucks and you can use your Android phone and home computer to locate and diagnose 99% of your problems - note that these will not test SRS and ABS systems - thats air-bags and Anti Lock Braking. Canada Rocks, as well as Knowledge and Experience! Hope this helps some.

  • Bobby Poirier
    Bobby Poirier Jan 21, 2014

    PS. Even if your coil-pack shows bad, sometimes its, its own ground in between the coilpack unit and the Ignition Module that it is attached to, or could be corrosion on the coil-pack pins to the Ignition module - this is not applicable to the engines with the coil built right into the spark-plug wire and inserts into the spark-plug itself. Most times you can take it all apart and clean it, then clean the surface that attaches to the engine or whatever it mounts to. The Coil-packs and Ignition module is at the opposite end of the spark plug wire. The whole unit can be removed and you can test individual coils for continuity (resistance with an V-Ohm meter as mentioned above. This will indicate if totally bad, oil on the surface of the coilpack may cause misfire., cracks in the coils allow water in and not sure if spray-and-go, silicone protector help much (wire drier). This may be useful if your vehicle misfire only in the winter or dies in the wet days or cool mornings. be good to spray some on your wires and coil packs before bad weather season but items must be cleaned from grease and oil - cleaners and degreasers are available but use eye protection and watch out for sparks or boom baby! lol.

  • Bobby Poirier
    Bobby Poirier Jan 21, 2014

    Sorry, at the end there I forgot to say that I use a brake cleaner spray or throttle body cleaner spray and it is this stuff that is highly flammable not the degreaser.

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  • Cars & Trucks Master
  • 5,370 Answers

Its faulty coil.

Get the compression test done on each coil.these will let you know if its faulty coil or not.

=========

It can be issue with spark plugs or faulty spark plugs. Also get the compression test done for cylinders. If any of cylinder shows low compression then required, then that particular cylinder will cause misfire.

Also get obd codes scanned, the error code will let you know which cylinder is misfiring or all cylinders are misfiring.

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For your trouble shooting I suggest you to refer the help oinks below. It has step by step details for many engine misfire issues.

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Click the link below:-----


Ford Explorer Cylinder Misfire?

http://whoisbyme.blogspot.in/2012/06/ford-explorer-cylinder-misfire.html

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Engine Misfire codes on Chevrolet Malibu?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html

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Cylinder 6 Misfire?

http://howtobyme.blogspot.com/2011/12/cylinder-6-misfire.html

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Misfire on cylinder 4?

http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html

-----

While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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Ford Explorer 5.0L: Engine Miss?

http://whoisbyme.blogspot.in/2012/06/ford-explorer-50l-engine-miss.html

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Oil on spark plugs and car misfires?

http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html

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Can cylinder misfire Damage the Catalytic converter?

http://schematicsdiagram.blogspot.in/2012/02/can-cylinder-misfire-damage-catalytic.html

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Car misfires and error code P0306 and P0303 is shown?

http://technoanswers.blogspot.com/2012/01/car-misfires-and-error-code-p0306-and.html

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Chevrolet K1500 No spark, random misfire

http://repairhelpcenter.blogspot.com/2012/11/chevrolet-k1500-no-sparkrandom-misfire.html

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2004 Ford F150: Engine Misfire and Lean Code?

http://whatisbyme.blogspot.in/2012/05/2004-ford-f150-engine-misfire-and-lean.html

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1995 Toyota LS: Misfire at idle or low RPM

http://whatisbyme.blogspot.in/2012/04/1995-toyota-ls-misfire-at-idle-or-low.html

--------------

Toyota Corolla: Random Misfire?

http://technoanswers.blogspot.in/2012/04/toyota-corolla-random-misfire.html

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2006 Ford Freestar: Misfire on Cylinder Number 2?

http://whatisbyme.blogspot.in/2012/06/2006-ford-freestar-misfire-on-cylinder.html

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This will help.

Thanks.

Posted on Nov 28, 2012

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