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Old 05-01-2009, 02:07 PM   #1
MR2fanatic
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Join Date: Nov 2003
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03 WRX
PSM

Default ..:: misfire cyl 2 - COIL sparking arcing VIDEO ::.. please help diagnose

MY car is a 1998 2.5 RS with 110k miles on it.


So my car has been intermittently misfiring on cylinder 2. I verified the code with my OBD2 scanner. I've also been researching about the possible reasons that this could be happening:
- bad injector
- valve adjustment
- bad plug and/or wire
- bad coil
- bad front o2 sensor

I've been waiting for it to misfire again so I can verify that the plug is even firing. Well today it started acting up again....it always happens when it rains... and popped the hood and noticed that the coil is arcing or sparking on the plug wire. The link below shows the video of what is going on. Does this seem to be a coil, spark plug, spark plug wire, or all of the above? Any and all help will be greatly appreciated.


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Old 05-01-2009, 03:30 PM   #2
wirolla
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if i were you i would put on oem wires, oem plugs, and an oem coil. Otherwise just replace the coil. If you look closely enough u can probably see that it has a crack.
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Old 05-01-2009, 04:16 PM   #3
rivman05
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I had the same thing on my contour....the coil is cracked, or that wire clip is broken. Replace the coil and wires and ull be fine.
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Old 05-01-2009, 09:15 PM   #4
yarrgh
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Black Diamond Pearl

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yup, looks like your coil is borked.
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Old 05-01-2009, 09:16 PM   #5
RaceFaceXC
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the spark is weak, too. so defanately replace the coil instead of trying to repair it. The aircraft i work on with piston engines do this sometimes, always due to a crack in the magneto distributor block, so look closely for cracks or deep burns in the coil housing if you are curious. either way, the coil needs to be replaced.

good idea to check/replace the plugs since a weak/intermittent spark can cause fouling which can lead to uncleanable buildup or damage to the electrodes.

after replacing you should see a noticeable increase in power and gas mileage, too
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Old 05-01-2009, 10:10 PM   #6
ciper
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The coil pack is bad.

The cause of this failure is most likely that you (or the previous owner) did not replace the spark plugs and wires at the appropriate time which forced the spark to find an easier path to ground.
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Old 05-02-2009, 12:18 PM   #7
wirolla
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just replace the coil, plugs, and wires with oem parts.

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Old 05-02-2009, 07:35 PM   #8
MR2fanatic
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Ordered up a set of oem wires and coil. Thanks for the advice
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