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Old 10-30-2012, 08:58 PM   #1
twistedmentality
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Default Common Problem ? Valve Cover Gasket Leaking Causing Misfire

is it common for a valve cover gasket to leak around the spark plug causing oil to foul out the plug ?

my car was shuddering and spitting yesterday and i took it to the mechanic. read the codes and took the boot off of plug 3 and it was full of oil. he said it was a common problem with cars that had recessed plugs.

wondering what you guys thought.

thanks.
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Old 10-30-2012, 11:44 PM   #2
KelConquer
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It can happen, it was one of the troubleshooting things I went through to find out why my #4 was misfiring, bought new spark plugs and gasket all ready to do the job but under inspection there was no oil on my plugs so since i'd already gotten all of the supplies I replaced both valve cover gaskets anyways, including the gaskets that go around the spark plugs themselves. Chances are one of the gaskets around your plugs is letting oil onto the plug. The job can be done yourself with patience, some of the bolts are hard to get to depending on what side you'll be working on..
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Old 10-31-2012, 12:10 AM   #3
twistedmentality
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i was quoted 300.00 for the job. thats from a local shop my brother in law is in partners with so i trust them but dont get no break on prices...

id take it to Ramono where i got it but i know they will be even more expensive ( i see your from Syracuse, i live in Auburn)
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Old 11-02-2012, 03:36 PM   #4
evilWagon
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Check out the DIY thread, I added information specific to the 06/07 after I did mine, because of the design of the AVLS systems in our cars you have to disconnect the engine mounts and raise the engine to have enough clearance to remove the driver side cover and do a proper job. The passenger side is easy enough to get off with the engine still in place but a paint to get back in place while keeping the gasket where it should be. I failed the first time, it shifted and got pinched and started leaking oil on startup.

You CAN do it yourself with some basic tools, time and patience though. The 3M gasket glue is awesome as well but it's $$.
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Old 11-02-2012, 05:47 PM   #5
treksofar
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Happened on mine. Passenger side went first. Took 45 min to replace gasket and tube seals...$35 in total for parts.
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Old 11-04-2012, 01:11 AM   #6
twistedmentality
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Quote:
Originally Posted by treksofar View Post
Happened on mine. Passenger side went first. Took 45 min to replace gasket and tube seals...$35 in total for parts.
hmmmm, i was told 3 hours.
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Old 11-04-2012, 01:30 AM   #7
GEE-OTTO
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Quote:
Originally Posted by twistedmentality View Post
hmmmm, i was told 3 hours.
It takes a while to do the gaskets on both sides at home. You will need to raise the engine up quite a bit to ensure enough clearance to get the coves off and on without compromising the new gaskets positioning.

I bought the OEM Subaru kit over the FELPRO kit even though is cost more. $300 isnt that bad, I was quote $470 to do the gaskets and adjust the valves so rather than risk it ill probably go that route.
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Old 11-05-2012, 12:52 AM   #8
twistedmentality
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well it should be done monday. ill let ya know how it went.
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Old 11-05-2012, 01:27 PM   #9
07RezaWagon
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The passenger side gasket went on my 07 with 75k miles.. it was only like 35 bucks for the gasket kit at oreilly and an hour of wiggling the cover off and back on.
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Old 11-05-2012, 03:29 PM   #10
BlackFighter
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Easy to do it yourself. Just need small hands and time. $300 is crazy to pay.
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Old 11-06-2012, 03:45 PM   #11
twistedmentality
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well its all finished. working well. with the weather crappy here and the fact they had to jack the engine im glad i had it done by a shop.
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Old 11-13-2012, 02:15 PM   #12
gdoggmoney
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Adjust your valves while in there if you have an SOHC car.

I heard "They are noisy engines, no worry" millions of times. My exhaust valves were 2x+ what they should have been and intakes were way out of spec too.

Gained a bunch of power and lost a bunch of misfires from the newfound seal as well as the proper valve lift and timing.
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Old 04-16-2014, 05:11 PM   #13
teledan73
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I know this thread is old but I am having similar symptoms with my 99 Impreza Outback Sport. The car seems to run fine around town but I have noticed that if I drive on the freeway for a little while, the car starts running rough and eventually the check engine light will come on. The other day this happened to me so I pulled over and looked under the hood and one of the spark plug boots had come out! So I pushed it back in and it popped in nice and tight and the car ran fine. A little while down the road the same thing happened so I popped the hood and sure enough, the spark plug boot had popped back out! I pushed it back in and made sure it was in there tight, I would have to pull pretty hard to get it back off so I pushed it back in and kept going and the same thing happened maybe 6 or 7 times before I got home! I also noticed a small bit of oil on the spark plug boot. Here is my theory. I am thinking I have a leak in the spark plug seal and/or valve cover gasket and the blow by or pressure from the motor is popping the spark plug boot out when the car is revving high for an extended period of time. Does this sound crazy? or even possible? I think I am going to replace the valve cover gaskets and spark plug tube seals anyway because I have a small leak in the valve cover gasket, but has anybody ever heard of this sort of thing happening?
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