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Old 02-27-2018, 07:32 PM   #1
 
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Default No compression
I bought a 2007 mazdaspeed3 last month and the dude told me all it needed was a coil pack. One month later I have replaced all coilpacks, spark plugs, and checked the injectors. I'm getting spark and fuel, just no compression In cylinders 1 and 3. The other two cylinders had good compression, I can't remember the exact numbers. I'm not leaking any oil or have oil mixed in with my coolant. What could cause the total loss of compression in only two cylinders? I've searched the forums and haven't found much helpful information. I apologize if I anger you veteran members with my stupidity
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Old 02-27-2018, 08:13 PM   #2
 
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I would say if compression is zero.....

Bent/broken valves, piston gone or well fucked, compression tester not being hooked up correctly....
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Old 02-27-2018, 08:28 PM   #3
 
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A leakdown will tell you where it's failing.
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Old 02-27-2018, 09:00 PM   #4
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compression tests would be a complete waste of time if they weren't so easy.

you're gonna have to do a leak down test, and do it correctly.
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