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Compression off every other cylinder?

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Old Nov 4, 2020 | 09:42 PM
  #1  
Andy Yang's Avatar
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From: Salem,OR
Compression off every other cylinder?

Did a compression test on my 05 evo 8 MR.

From left to right

160,175,160,175

Any idea why they weren't all together?

Did the test cold with gas pedal floored. Cranked each cylinder 7 times.
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Old Nov 5, 2020 | 08:59 AM
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Do the test warm and get back to us. Drive the car around for ~15 minutes to fully warm it up. Let it cool for ~15 minutes so the head isn't piping hot when you pull the plugs out, and retest.

When you do comp test cold, especially if you fire the car up and it runs for ~30-60 seconds to pull it into the shop, the cold enrichment can wash down the cylinders, and its often uneven.
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Old Nov 5, 2020 | 12:00 PM
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Andy Yang's Avatar
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From: Salem,OR
Originally Posted by letsgetthisdone
Do the test warm and get back to us. Drive the car around for ~15 minutes to fully warm it up. Let it cool for ~15 minutes so the head isn't piping hot when you pull the plugs out, and retest.

When you do comp test cold, especially if you fire the car up and it runs for ~30-60 seconds to pull it into the shop, the cold enrichment can wash down the cylinders, and its often uneven.

Gotcha. Ill take it out and warm it up then get back to ya.
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