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Old 08-08-2012, 04:10 PM   #1
nasiocjunkie
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Default Interpreting my compression readings

Did a compression test and got these readings

cylinder 1 - 220
cylinder 2 - 210
cylinder 3 - 210
cylinder 4 - 205


Is there anything else these readings are saying besides maybe carbon build-up? They're withing 10% of each other from a phase II 2.2 liter 97 OBS with 140K miles and are those readings typical for that motor with those miles? Thanks in advance!
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Old 08-08-2012, 04:34 PM   #2
cal_look_zero
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The fact that they're close is a good sign. Numbers seem higher than I remember, but that's not a bad thing. Looks fine to me.
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Old 08-08-2012, 06:48 PM   #3
bugeyetex
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Don't fix anything... its not broke Those numbers are great. Is there a reason you did a compression test or are you just bored?
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Old 08-08-2012, 10:34 PM   #4
nasiocjunkie
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Originally Posted by bugeyetex View Post
Don't fix anything... its not broke Those numbers are great. Is there a reason you did a compression test or are you just bored?
More curious than anything. Past four days I was under the hood chasing down a problem hence the test. If I ever decide on doing something fun with my OBS i.e. put a turbo in it I'd like to know now so I could start collecting parts. I'm also wanting to Seafoam my car to see if I could get the compression readings a little lower. I read somewhere online that if compression readings are slightly higher then there may be little to lots of carbon build-up inside.
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Old 08-08-2012, 10:45 PM   #5
nasiocjunkie
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Reason for the compression test:

The OBS threw a P0303 code during the weekend. Pulled the spark plug and cleaned with a wire brush. Tested again but car still had a rough idle and felt like it wanted to stall when put into drive or reverse. Since then these:

New plugs and wires
New coil pack
New coolant temp sensor
Cleaned maf but still want to know what the frequency readings are
Checked all hoses and all are good
New PCV valve
Cleaned throttle body and iac
New front 02 sensor
Checked all connectors under hood scoop and all were dry
Reset ecu

Started car after all that and rough idle went away but now it's running really sluggish with a bad throttle lag. I drove around the block hoping the the OBS would throw a cel but nothing came up. Next I want to check maf sensor, fuel filter/injectors/pump/hoses, timing, camshaft position sensor, compression ratio, and cat converters. I'm hoping I don't need to do a tear down but we'll see.

After two days of investigating:

Found auto-start wire melted on my egr pipe which blue a fuse and ruined my coilpack. Repaired wire and tucked away from pipe, new fuse, and new coilpack. Car runs even better with everything else done to it! Compression test readings cyl 1 - 220, cyl 2 - 210, cyl 3 - 210, and cyl 4 - 205. Will Seafoam soon and retest compression to see if those readings will go down. Yay for no more hesitation! Also maf sensor checked out. Brought my car to a garage and had them scan it and it passed. After finding and fixing problem the only other item I'd like to check/change is the fuel system. Other than that I'm pretty happy with everything that was done to it so far...and more to come!
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Old 08-09-2012, 12:42 AM   #6
bugeyetex
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how is the timing belt? if it skips a tooth or 2, it can run pretty bad. Also sounds like it could be an injector issue. IMO, replace the fuel filter if it hasn't been done in a while (super easy on your car), if that doesn't change anything, listen to the injectors with a stethascope(sp) or something similar to see if all 4 are clicking.
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Old 08-09-2012, 12:53 AM   #7
nasiocjunkie
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Originally Posted by bugeyetex View Post
how is the timing belt? if it skips a tooth or 2, it can run pretty bad. Also sounds like it could be an injector issue. IMO, replace the fuel filter if it hasn't been done in a while (super easy on your car), if that doesn't change anything, listen to the injectors with a stethascope(sp) or something similar to see if all 4 are clicking.
When I bought the car last October that was one of the first things were the belts. Also did front/rear diff fluid change, transmission oil and filter, motor oil and filter, got brakes and 85 point inspection. Since then I've been changing/adding things here and there and I'm very happy with where it stands at the moment. I may not be turbo'd up as of yet but I don't mind since gas prices can't seem to make up its mind with everything else.
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Old 08-09-2012, 02:05 AM   #8
bugeyetex
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I had a 96 obs with 235k on it that I sold when I left Seattle about 2 years ago. It was a sweet dd beater, wrx interior and 16's, I missed that car until I got my wrx...
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Old 08-09-2012, 04:25 AM   #9
nasiocjunkie
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Currently and far from done...











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