Banks one & two fire but no fire on three & four. Have changed coil twice.
SOURCE: 2000 subaru legacy 2.5 ltr overheats after
Hello, irishill and thank you for asking your question on Fixya!
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SOURCE: 1990 Subaru Legacy shorted out
Subaru engines (including Legacy and engines of many other automobiles, GM, etc.) have returned to so-called wasted spark ignition systems since advent of the electronic distributor-less ignition (having been used historically in early engines with magneto ignitions). With this approach, the ignition systems are less expensive and usually quite reliable. At the same time, however, a shorted spark plug (cracked or carbon clogged, etc.) (or bad ignition spark plug wire) grounds both the ignition spark and the false spark being used. This means that it also grounds the corresponding respective ignition spark of the other 180 degree out of phase cylinder (that uses the same the same coil because the spark current is connected to the spark plugs of two cylinders). Since such a defect allows more current to flow in the spark coil to two plugs when the resistance of the spark plug gap disappears due to a cracked plug, etc, it seems likely to hasten coil burn out if the spark plug/plug wire defect is not corrected before installing the new spark coil.
To explain further, wasted spark means that when a cylinder is ready to fire, it gets a spark to its spark plug while part of the spark (from the same coil and current) as a sort of copy is also sent to another cyclinder at the same time but when the piston in that cylinder is exhausting its ignited gases 180 degrees out of phase from when its spark is needed. When the second cylinder is ready to fire and receives its "spark, the first cyclinder the also receivesa "wasted" spark "copy" of the one needed by the second cylinder. Economy is achieved in manufacture because otherwise electronics would have to turn on and off four different spark coils to distribute four different sparks as needed to the four cylinders. With wasted sparks (which are cheap), because the spark current of one coil is connected (internally in the ignition coil unit) to two cylinders that are in the same position but 180 degrees out of phase in firing, the system can turn on and off two spark coils twice as fast with half the electronics and fire two cylinders that are 180 degrees out of phase. A four cylinder engine thus uses only two coils, a six cylinder engine, three coils, etc., in a wasted spark system.
SOURCE: 1989 subaru legacy 2wD 2.0 vz
Welllllllllll how do I say this without incriminating myself too much, after furiously mad panic stations on the sunday, it was decided that first thing monday it would be towed to the electricians! as my husband had concluded it was electrical this came after new battery fuses etc.. had been checked and many an hour spent under the bonnet.As we have a kill switch, which I had tried an still did not go also I reminded my husband of this and he screamed at me its not the bloody kill switch @#!*!!? ok, have a GREAT DAY! So come monday morning after getting up early to drop my husband off at work dressed only in my dressing gown jammies and socks and slippers I duly dropped him off and used our pajero for the day which I ended up having to put 10 dollars in. That night he returned home with the subaru and a receipt for work done I ( I had visions of hundreds of dollars worth) but noooooo $54.00 great ah! Cos it was the kill switch !!!!.
We will never speak of this again!!!!! It is often the simple things in life that we overlook? TeeHeeee.
Linda
SOURCE: My 2003 subaru forester idle very rough. if you
1) Check all the vacuum hoses for a leak in the rubber hose or a hose that isn't connected. Vacuum leaks cause motors to shake and stumble on acceleration.
2) There's a plastic T connection on the back side of the engine behind and under the air cleaner box. That T connector joins together three air hoses of different sizes and is prone to breaking from heat stress. Only a Subaru dealer will have this part.
3) Even though the spark plug wires are new, you may have a bad one. Don't waste your money on cheap parts; they cost more in the long run.
Good luck!
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