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Old 10-30-2005, 11:39 PM   #1
Scooby Newbie
Member#: 99608
Join Date: Oct 2005
Default Ignition problems

A couple weeks ago my wife's 1999 2.2 Legacy Wagon began running rough, bucking and then the check engine light began blinking on and off on her way home.

I ran the codes and got P0301-Cylinder 1 Misfire Detected. I changed the plugs as they were probably overdue anyway and planned to change the wires but nobody in town had them in stock. Since then I haven't gotten around to it. After the plug change it ran perfect until today when it all began again as before. I was out of town so my son ran the codes again and got P0301 (#1 Misfire) and P0302 (#2 Misfire). He checked the wires and found that only #'s 1 and 2 wires were corroded green where they contacted the coil. #'s 3 and 4 were fine. he cleaned them up and it helped a little but it's still misfiring and throwing codes. I will order wires tomorrow and replace them but I also want to check the coil.

The problem I have is that the only manual I'm able to find local is for 1990 to 1998 Subarus. I was going to check the coil's primary resistance but the number of terminals on the coil's plug don't match from the manual to my 1999 model. The book says to check resistance between terminals 1 and 2 in order to check the 1-2 coil pack and to check the resistance between 2 and 3 to check the 3-4 coil pack. My coil has four terminals not three as the manual shows. I have a Diamond coil.

Does anybody know the procedure for checking the primary resistance on a four terminal coil? I'd also like to know the correct value range to look for as I don't trust this manual to be correct for my year model. This manual says the range should be 0.62 to 0.76 ohms.

I did check the secondary resistance and got 12.4k-ohms between 1 and 2 and 12.4k-ohms between 3 and 4. My manual calls for 17.9-24.5 on a Diamond coil but again I'm not sure I trust the manual. Can somebody also supply the correct values for this.

Thank you much,
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Old 10-31-2005, 12:45 AM   #2
Scooby Specialist
Member#: 17315
Join Date: Apr 2002
Chapter/Region: International
Location: Date Line Denies F-22s
MY95 Impreza 207C
MY05 Forester 257X


Hope this helps

-paK +2
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Old 10-31-2005, 04:39 AM   #3
sixpack subaru
*** Banned ***
Member#: 64974
Join Date: Jun 2004
Location: My Shed, Melbourne, Australia
1995 WRX,APEXi,HKS,$
Faded, Stonechipped Red


Great info Pakin,
I would not worry about the coil, clean it with a brass wire brush, apply some dielectric grease, re-crimp or replace ign leads and you should be fine. (we has HEAPS of these over here, I recon I did twelve in one month once!!)
And only EVER 1and 3 cyls!!


Sixpack Subaru
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Old 11-01-2005, 01:09 AM   #4
Scooby Newbie
Member#: 99608
Join Date: Oct 2005

Thanks for the quick reply. I checked the primary between 1 and 2 and it was out of range. I replaced both the coil and the wires today with OEM parts and so far so good. I was also told that the coil towers may be cracked and letting moisture in to corrode the contact under the boots. Thinking about it makes sense- it ran fine for a couple weeks and it was dry all that time. It rained hard on Friday and Saturday for the first time and Sunday it was misfiring again. The corrosion was very thick on #1 and not quite as bad on #2. Hopefully this is it. I suppose when I replaced the plugs a couple weeks ago all I did was reduce the gap which allowed the weak spark to jump it until the corrosion finally got bad enough to again add too much resistance to the lead. Downward spiral.
Thanks again.
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