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Old 06-11-2010, 02:40 PM   #1
kgeezy
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Default please help cylinder 1 and 3 missfire

i have a cylinder 1 and 3 missfire on my 99 rs. i pulled the one plug and it had a little oil on it. im guessing this is caused by a bad valve cover and sparkplug gasket. would replacing those stop the miss? it is throwing 2 cel's and i have a borla replica header and a catback exhaust that been on for a few months with no problems. otherwise the car is stock. its most notceable at idle and is very rough. allready tried swapping out the plugs and wires but that did nothing. any ideas at all?
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Old 06-11-2010, 03:09 PM   #2
kakarotoni
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You tried swapping plugs and wires? By that you mean switching them from one side to the other? I would try getting new plugs first off, then fix your valve cover gaskets so oil doesnt get on the plugs again. And perhaps, new coil packs. But, if you've tried to isolate the problem by switching and you dont think the coil packs are the problem then at least get new plugs.
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Old 06-11-2010, 03:29 PM   #3
kgeezy
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no well i switched the plugs and wires out of my brothers 2.5rs that runs perfectly. and the amount of oil was so miniscule that it wasnt even on the boot. i dont know what else to try
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Old 06-11-2010, 03:32 PM   #4
treksofar
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I had a constant miss with #3 a few months back. Did all the same things, changed the plugs and wires. The oil is casusing the electricity in the boot to arc once it works its way up there. For some odd reason it's usually the passengers side that goes first. Anyway, if you change the tube seals and valve gasket you should be golden. While you are working on the car, pull the plugs to allow any acumulated oil to drain out. After you pop new plugs in give the contacts on the wires a quick cleaning to remove oxidation from the arcing (I found useing a copper .22 bore brush worked perfectly).
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Old 06-11-2010, 03:43 PM   #5
kgeezy
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just swapped the coil pack from my bros car. still nothing. shouldnt his stuff be working cause it doesnt have any oil on it yet? not even the stuff from my car has oil on it really. i dont think its that much oil if barely any
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Old 06-11-2010, 03:53 PM   #6
treksofar
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if you put in clean plugs are wires and have it run fine like you mentioned above....drive it around for a day or two...i'm almost 100% certain that the miss will come back and you will see some oil build up. if thats the case then your tube seals are deff shot. It honestly doesnt take much oil at all to cause this issue. Just a fine amount of film up the boot is all it takes.
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Old 06-11-2010, 03:56 PM   #7
kgeezy
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yeah but when i put clean plugs and wires in the miss doesnt go away at all
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Old 06-11-2010, 03:59 PM   #8
treksofar
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are you re-useing plugs after you take them out?
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Old 06-11-2010, 04:01 PM   #9
kgeezy
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what do you mean? and also when i originally pulled the plugs on my car there was only oil on one of them. so shouldnt it only be one of the cylinders missfiring? not both
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Old 06-11-2010, 04:11 PM   #10
treksofar
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spark plugs are one time use. once you torque them down the crush washer on them keeps the plug seated and prevents it from backing out. if you re use them, they may not seat well again and you may need extra torque to have them stay put. It it uber important not to over torque them in a subaru since the block is aluminum and the plug threads are a harder metal.
How did you determine that it was both cylinders? Also, is the oil on just the threads/insulator or is it on the electrode as well? What do the electrodes look like (slightly grey, blackened, white deposits, gooky carbon buildup)
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Old 06-11-2010, 04:17 PM   #11
kgeezy
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yes iwas reusing the plugs. i determined it was both cylinders using my obd scanner to read the check engine light it was throwing. i think there was oil on the electrode and threads. the elctrode is slightly gray to blackened a little id say. i guess next thing ill try is putting 2 new plugs in and doing the valve cover gaskets?
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Old 06-11-2010, 04:38 PM   #12
treksofar
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ok. exerpt for the oil, it seems like there's nothing disasterously wrong in the combustion chamber. if there's oil on the electrode that usually means the valve seals/guides are going or the piston rings are worn. both of which would cause misses. i'm still fairly certain it's the tube seals though. you probably have oil dribbling down the plug as you take it out. since valve work or piston work is $$$$$$$$ i would go ahad and replace the valve cover gasket, tube seals, and plugs. you are really only looking at like $20 worth of pars and an hour max of labor. if that doesnt fix anything then have someone perform a compression test on the motor to determing if there is indeed a valve/piston ring issue. i'm going to PM you with something to help you out.
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Old 06-11-2010, 04:40 PM   #13
kgeezy
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yeah i sourced all the gaskets at the dealer for $37 both tube gaskets< valve cover gasket and the washer gaskets. thanks alot for all your help man
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Old 06-12-2010, 01:25 PM   #14
kgeezy
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well went out to buy those gaskets today. bought them and cam eback and did a compression test on cylinder 1 and 3. they both came up to around 75-80. guess that means its time for a rebuild
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Old 06-17-2010, 09:21 AM   #15
snoopyone8
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Is it a phase 1 DOHC engine or a phase 2 SOHC?

The phase one's have an ignitor as part of the ignition system. It is mounted on the top/center of the fire wall just behind the intake plenum. Its about the size of a credit card, only a little bit thicker.

Mine fried when I left my ignition on(engine off) while running the PerfectPower6 piggyback ECU (a known problem). When it went bad, the car ran on only two cylinders.
I bought a used one at the bone yard for $25 and never left my ignition in the on position again without the engine running.

Zero issues since.

-adam
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Old 06-17-2010, 09:51 AM   #16
eppoh
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Maybe not a total rebuild-just the head and new head gasket. Did you check compression on 2 and 4? Was it overheated before?
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Old 07-27-2010, 10:28 PM   #17
kgeezy
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yeah i just bought a head gasket kit. it pretty much came with all gaskets. gonna throw the heads on once i get the gaskets in and test com pression. if that isnt it ill do rings
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