RobJ426 Posted October 31, 2005 Share Posted October 31, 2005 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, Rob Link to comment Share on other sites More sharing options...
sea#3 Posted October 31, 2005 Share Posted October 31, 2005 Replace the coil . More than likely the coil towers on 1 and 2 are cracked causing moisture to enter past the boot and corode the coil tower connections and the plug wires A easy check to see if the coil towers are leaking is to take grounded wire and pass it over the coil when the engine is running SEA#3 Link to comment Share on other sites More sharing options...
idosubaru Posted October 31, 2005 Share Posted October 31, 2005 do not replace with regular wires, the 2.2 motor does not like aftermarket wires. there is an existing long thread about using aftermarket wires. use either Subaru OEM or magnecor wires. any others won't treat the 2.2 or 2.5 liter motors very well. some people swear by OEM only wires. i've had good luck with magnecor and know they've adjusted the design to compensate for the problems wires have on this motor. Link to comment Share on other sites More sharing options...
RobJ426 Posted November 1, 2005 Author Share Posted November 1, 2005 Thanks much. I replaced both the coil and the wires today with OEM parts and so far so good. No codes and the idle is smooth. 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.Thanks again. Link to comment Share on other sites More sharing options...
Setright Posted November 1, 2005 Share Posted November 1, 2005 Yep, Genuine Subaru ingition cables are good and offer very consistent quality. Most Subaru parts do, that's why the cars drive so well and last so long! Link to comment Share on other sites More sharing options...
suziq21 Posted November 1, 2005 Share Posted November 1, 2005 Hi all! I have (and still having) a very similiar problem to this. I have a 96' outback (2.2L) that blew out 2 plugs in Feb. The local repair shop replaced the ignition coil and plugs and wires as they said there was either a leak around the wires or coil and moisture got in or something else that I can't remember right now. Then, in July the same thing happened again! I replaced the plugs (NGK Plat) and wires (subaru's) and all was well. Until! this past week when I noticed yet another plug has been blown out! So, even with a new ignition coil, I am still having this issue. I've searched my Haynes manual for answers as well as online and have found very conflicting things. Anybody care to share some insight? Thanks! Link to comment Share on other sites More sharing options...
Cougar Posted November 1, 2005 Share Posted November 1, 2005 Would you explain what you mean by a "blown out plug" and which one it was? Link to comment Share on other sites More sharing options...
suziq21 Posted November 2, 2005 Share Posted November 2, 2005 Sure! One plug was melted with lots of carbon deposition where it goes into the cylinder, the other was almost as bad. Both cylinders had stopped firing. I know it was the #4 that was melted and I can't remember the second one. They had to "dig" (for lack of a better term) #4 out. The second time it was just #3. it wasn't even threaded in-it had come out of the threads without stipping the threads out. Its appearance was very similiar to the #4 in the 1st incident. the #2 looked a like it was on its way to looking like #3 but it was still firing. This time it is again #4 (not firing) and the plug wire isn't coming off too easily. I actually haven't been able to get it off yet. I've never had this problem with any of my other cars. Plugs stay put and wires come off when you need them to. The car has 169K and has been relatively good to me. I'm in school, so $$ is tight. so I was just looking to see how much I could do at home. I really can fix some things:) Thanks:) Would you explain what you mean by a "blown out plug" and which one it was? Link to comment Share on other sites More sharing options...
tunered Posted November 2, 2005 Share Posted November 2, 2005 you are going to have to stop using that drip gas,its hard on things. ed Link to comment Share on other sites More sharing options...
Cougar Posted November 2, 2005 Share Posted November 2, 2005 Melted plugs? Wow! You do have a problem here. I can only guess there is a timing issue causing this. Are the plugs the correct heat range? Link to comment Share on other sites More sharing options...
RobJ426 Posted November 2, 2005 Author Share Posted November 2, 2005 I have to say my plugs all looked very good. When I replaced them the first time I had problems, the electrodes were slightly rounded as you would expect from plugs due for replacement but the color of the burn was perfect. That nice tan with no deposits at all. Sounds like timing or maybe a really lean mixture on those fried plugs. This is my first vehicle with DIS ignition and I've been learning over the year we've had it so there may be conditions to cause that of which I'm not aware of. Link to comment Share on other sites More sharing options...
suziq21 Posted November 2, 2005 Share Posted November 2, 2005 Thanks all! My husband has told me to bite the bullet and just run it down to the shop and let them have all the fun of figuring the problem out Funny, this did start ~1000 miles after a new timing belt was installed... I'm dying to try to take the #4 out and get a pic of it. The wire seems to be a bit fused to the plug at the moment.. But again, thanks for the insight! I have to say my plugs all looked very good. When I replaced them the first time I had problems, the electrodes were slightly rounded as you would expect from plugs due for replacement but the color of the burn was perfect. That nice tan with no deposits at all. Sounds like timing or maybe a really lean mixture on those fried plugs. This is my first vehicle with DIS ignition and I've been learning over the year we've had it so there may be conditions to cause that of which I'm not aware of. Link to comment Share on other sites More sharing options...
Cougar Posted November 3, 2005 Share Posted November 3, 2005 If the notch was a tooth off then than would change the timing and possibly cause the damage you have. Link to comment Share on other sites More sharing options...
subie94 Posted November 3, 2005 Share Posted November 3, 2005 Would you explain what you mean by a "blown out plug" and which one it was? in my 92 legacy,i had a spark plug blow out.it was my fault though.replaced plugs with the bosch plat plus 4 and i must of cross-threaded it cause i noticed it kept coming loose,finally one day i'm driving down the road an pop! all of a sudden car's running real rough and i smell gas a bit.couple seconds later i manage to pull off and i open up the hood.low an behold there's one of my spark plugs hanging down by the wire.(can't remember what number but it was the rightside back) well i have it towed home an my mech has to come by an put in a heli-coil in.15-30 mins later she runs perfect. of course he thought my exhaust leaked cause i had an aftermarket muffler on Link to comment Share on other sites More sharing options...
RobJ426 Posted December 4, 2005 Author Share Posted December 4, 2005 Should have posted a follow up- sorry about that. Replaced the coil and wires with OEM ($200) and it runs perfect. First vehicle I've ever owned with DIS. Thanks for the help everyone. Link to comment Share on other sites More sharing options...
vic/se Posted December 4, 2005 Share Posted December 4, 2005 Should have posted a follow up- sorry about that. Replaced the coil and wires with OEM ($200) and it runs perfect. First vehicle I've ever owned with DIS. Thanks for the help everyone. I'm just curious. your ignition cables are "oem" so could you tell me what's written on them? Link to comment Share on other sites More sharing options...
RobJ426 Posted December 5, 2005 Author Share Posted December 5, 2005 I'm just curious. your ignition cables are "oem" so could you tell me what's written on them? I'd guess their suppliers vary over the years but the ones I just bought from the dealer and were in the Subaru packaging read: *7mm HI-PERFORMANCE SILICONE SUPPRESSION CABLE* The boots matched the originals perfectly. Link to comment Share on other sites More sharing options...
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