Question about 1994 Yamaha XJ 600 Diversion S

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I have a 1996 xj600 Yamaha. I 've been experiencing a engine miss fire. I checked for spark by pulling each plug and grounding them out on the block. Number 4 doesn't spark at all, so I replaced the plugs and it still has the same problem. Could this be a bad plug wire or coil or CDI unit ?

Posted by Anonymous on

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Could be a bad wire or plug cap they have a resister in them, each coil fires two plugs, so if the other one works off that coil the cdi is probably ok.
pull the caps off and check the resistance from the plug wire back to the coil ground, they need to be the same, the wires are moulded into the coils so if one has high or open resistance-new coil required

Posted on Apr 09, 2011

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Posted on Jan 02, 2017

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1996 Dodge Caravan
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c17hydro_162.gif

The big rectangles are referencing the engine, the cylinder associated to it's "firing" are the colored circles, and the are also the location of the spark plugs....the smaller lego-looking block is your coil pack. The spark plug wires run from the coil pack to the spark plug on the engine. The wires match 1 to1 or black to black...and so on....

When these are matched to each cylinder/spark plug and it's wire leading to the matching coil pack position, this is it's "firing order". If one of the wires is "crossed" meaning, not 1 going to 1, then the engine will "miss-fire".

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