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Old 10-13-2012, 06:44 PM   #1
zZzZz
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Join Date: May 2010
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2002 WRX Wagon

Question Low compression test results?

Since I had some time today I did a compression test on my 02 wrx. I went for a short drive to warm it up and then let it sat for about 30-40 mins to cool down a little before the test

Results:
Passenger Side
150
145
Driver side
120
120

The car has about 155k mile on it. The numbers don't look impressive to me since their a little off

Not sure if this info helps but it has a cobb stage 1 flash and I was using a cheap $20 compression tester.

I had plans to do TBE and use it as a daily / secondary auto-cross car ...

Should I leave it and stick with the plan and still mod it ??? What do you guys think???

Any advice / input will be greatly appreciate it

Thanks!!!
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Old 10-13-2012, 09:35 PM   #2
brew02wrx
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Quote:
Originally Posted by zZzZz
Since I had some time today I did a compression test on my 02 wrx. I went for a short drive to warm it up and then let it sat for about 30-40 mins to cool down a little before the test

Results:
Passenger Side
150
145
Driver side
120
120

The car has about 155k mile on it. The numbers don't look impressive to me since their a little off

Not sure if this info helps but it has a cobb stage 1 flash and I was using a cheap $20 compression tester.

I had plans to do TBE and use it as a daily / secondary auto-cross car ...

Should I leave it and stick with the plan and still mod it ??? What do you guys think???

Any advice / input will be greatly appreciate it

Thanks!!!
Do the test again, this time let your car sit until its warmed up (give it around 15-20 minutes should be long enough to get the oil warmed up) and don't let it cool down after you shut it off, do the test right then, if the results are the same you've got an issue and more power is a bad idea

You shouldn't do a comp test after things have cooled down because you'll get wrong readings and you should let it sit so you don't make it hotter than it has to be, you wanna be able to get your hands in there without burning yourself right??
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Old 10-14-2012, 01:05 AM   #3
recce02
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Quote:
Originally Posted by brew02wrx

Do the test again, this time let your car sit until its warmed up (give it around 15-20 minutes should be long enough to get the oil warmed up) and don't let it cool down after you shut it off, do the test right then, if the results are the same you've got an issue and more power is a bad idea

You shouldn't do a comp test after things have cooled down because you'll get wrong readings and you should let it sit so you don't make it hotter than it has to be, you wanna be able to get your hands in there without burning yourself right??
Actually it really doesn't matter if car is warm or cold. Numbers do change a little bit, but what you are looking for is a constant. Either warmed up or cold it doesn't matter but pick one.
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Old 10-14-2012, 05:14 AM   #4
zZzZz
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So should I be very sad ???
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Old 10-14-2012, 06:12 AM   #5
rexblake
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Redo the test to be safe. Def don't mod it. A slight variation in numbers is fine, your a bit outside the deviation. Unless the car cooled down that much while you performed the test. I always did mine on a cold engine, no reason to burn yourself. The numbers will read lower on a cold engine, but as stated, it's all about consistency in numbers.
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Old 10-14-2012, 04:02 PM   #6
2gnt2wrx
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I wouldn't jump to conclusions until you do it hot. I've seen cold numbers all over the road, then hot numbers fall within spec. If you aren't pulling your hand away because you are getting burnt.... it ain't hot enough.
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Old 10-14-2012, 07:49 PM   #7
zZzZz
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redid the test w/ the car semi-hot. This time about 10 mins after shut off (considering the time it takes to remove everything). I just let it sit there until the temp needle was in the middle. Didn't take it for a drive. Results were about the same.

The car drives fine w/ no idle or hesitation issues, no smoke when driving and power delivery is good. However, the car might be due for a timing belt change.

At this point what would you guys recommend?

Last edited by zZzZz; 10-14-2012 at 08:19 PM.
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Old 10-14-2012, 08:56 PM   #8
rexblake
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Don't mod it, kept up with maintenance, drive it till it dies.
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Old 10-14-2012, 09:55 PM   #9
D-Rodman
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Replace the timing belt and related parts, keep up with maintenance, get every possible mile out of it. It'll be expensive to replace/repair the engine.
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Old 10-14-2012, 10:04 PM   #10
zZzZz
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The answers probably going to be no, but taking auto-x out of the equation, would it be ok to do downpipe and uppipe w/ cobb ap stage 2 flash for daily driving (I already have all the parts)? It's mostly going to be highway use and I usually don't push my car and only use the power when necessary.
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Old 10-15-2012, 03:54 PM   #11
CanadianImprezaSTi
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Mod it and drive it till it dies if your not overly concerned about it. It's an 02 with 155k on it. I doubt your into the car for that much cash.

Joel
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Old 10-15-2012, 04:08 PM   #12
zZzZz
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Yeah, I would be sad if the engine blows, but I've been reading up on STI swaps and might eventually consider that if the engine does go.
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Old 10-17-2012, 03:35 AM   #13
zZzZz
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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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Old 10-17-2012, 06:02 AM   #14
jaxscuby
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still do compression test.
since you will be taking out the spark plugs..inspect them..
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Old 10-18-2012, 01:46 PM   #15
Soarer
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Could be a bad head gasket or cracked head. Not necessarily a bad short block.
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