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Old 04-09-2013, 06:45 PM   #1
overb00st
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Member#: 297501
Join Date: Oct 2011
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Location: Detroit MI
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04 WRX
PSM

Default Misfires, low compression

Hey guys, got a few questions for ya.
I've got a 04 WRX that I've been getting misfire codes on for almost a year. The car has never driven differently when the CEL comes on so for a while I didn't think much of it. The code would come on and off occasionally but yesterday I decided to finally do a compression test to see if anything serious was going on. Cylinders 2/4 were at 155 but 1/3 were at ~110.
Now, I'm hoping that its a headgasket issue and not something with the pistons/rings since the 2.0's aren't particularly known for those issues.

If it is only the headgasket, I'd plan on machining the heads, getting ARP head studs and gasket set and throwing it all back on, although if there is piston/ring damage I'm prepared to have to fix that as well.
Wondering if there is anything further you'd recommend doing or any other advice you have.

One question though, a buddy of mine said it could be timing related, but I thought if timing was off that the valves would be messed up and the car would be dead. Mine runs and drives smooth no problem. Any insight on the timing issue?

-Ian
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Old 04-09-2013, 06:59 PM   #2
super_usdm
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Location: Sacramento, CA
Vehicle:
2003 WRX
1993 Legacy SS

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Quote:
Originally Posted by overb00st View Post
One question though, a buddy of mine said it could be timing related, but I thought if timing was off that the valves would be messed up and the car would be dead. Mine runs and drives smooth no problem. Any insight on the timing issue?
It's worth a look and will only take a few minutes. Remove your timing belt covers and put the crank pully at tdc, then check the marks on your cam gears to see if they line up. I was getting misfires randomly and a potential cause was my timing belt being strecthed. But, my compression numbers were between 115 to 130 across the board. It's also possible that your timing belt skipped a tooth on one of the pullys.
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Old 04-09-2013, 07:16 PM   #3
overb00st
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Join Date: Oct 2011
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Location: Detroit MI
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04 WRX
PSM

Default

^ right. I thought our motors would be entirely shot if timing was off though? Or am I wrong on that?
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Old 04-09-2013, 08:37 PM   #4
neurosis05
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Location: Omaha, Ne
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2005 WRX stage II
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I was having misfire issues on cylinder 1 & 3. Turned out timing was off. Idled a little rough but other than that ran fine. So didn't think it was timing either. Apparently the valves are fine.
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Old 04-09-2013, 09:13 PM   #5
overb00st
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04 WRX
PSM

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thats good to hear. I'm taking it to a shop Friday for their full diagnosis (comp/leakdown/timing check). I will be extremely relieved if its just timing.
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