Bad compression / Need advice - Subaru WRX Forum
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#1 Old 10-15-2012, 02:58 AM
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Bad compression / Need advice

Hi everyone,

I just bought a 2002 wrx wagon not long ago. Had some time to do a compression test but the results were not great:

Passenger Side: 150 & 145
Driver SidE: 120 & 120

The car doesn't smoke, power is good, idle is good, no hesitation.

What do you guys think? Rebuild or keep driving and be easy on it?
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#2 Old 10-15-2012, 05:52 AM
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Have you looked into a used block yet? And maybe build this one at your leisure?

Paul
2007 XT
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#3 Old 10-15-2012, 09:41 AM
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that's enough to run. Just drive it. It might hold on a lot longer than you think.

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#4 Old 10-15-2012, 12:46 PM
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I mainly use the car for weekend trips (short 100-200 miles trips) that are mostly highway miles. I drive my car very mildly. Would it be a bad idea to put a catless downpipe and uppipe on there and go w a stage 2 cobb ap flash? I'm currently running a stage 1 flash and have all the parts for the stage 2 stuff, but thought I'll do a compression check first ... and... yeah ...

Meanwhile, I can contemplate about a STI swap somewhere down the road.

Just to add, I might be due for a timing belt service... not sure if that can be a cause as well (maybe a skipped a tooth or two?)

Thanks!
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#5 Old 10-15-2012, 02:46 PM
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How many time did you do the test? I test each cylinder 3 times.

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#6 Old 10-15-2012, 03:23 PM
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I did the whole test twice... I took 3 readings per cylinder
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#7 Old 10-15-2012, 03:37 PM
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Hmmmmm.... I just find it odd that you have low compression on one side and they are the same.

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#8 Old 10-15-2012, 03:42 PM
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do you think it can be cause by the timing being off?
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#9 Old 10-15-2012, 06:38 PM
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Unless the cams themselves spun, no because all of your numbers would be low....Give me a second and I will try and figure it out...

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#10 Old 10-15-2012, 07:01 PM
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Read up on this a bit,
F'd up coil packs
Bad head gasket

Those were the two main causes for this to happen.

My research took me to other vehicle forums ( not wrx) but motors are motors.

OP, GL

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#11 Old 10-15-2012, 07:07 PM
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thanks for the help!!! I really appreciate it!
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#12 Old 10-15-2012, 08:09 PM
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NOTE: could also mean other things as well, those I listed were the common ones.

Just wondering, how's your oil?
Are you burning it?
Does it have discoloration or signs of having antifreeze or water in it? (Foamy white)

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#13 Old 10-15-2012, 08:33 PM
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I just find it odd that both numbers are the same...which makes me think it's not a head gasket.... it isnt the coil packs either that would cause misfires....head gasket would cause idling issues as would timing belt jumping....

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#14 Old 10-16-2012, 02:42 AM
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I agree, or possibly a cracked head. There should be other signs though.

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#15 Old 10-17-2012, 02:38 AM
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fml .... today I got P0302 and P0304 ... misfire on cylinder 2 and 4 .... the 2 w/ the low compression? this happened the moment I turned the car on today ... was fine yesterday... though I did start noticing a slight hesitation at idle when it was cold... what to do now?
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