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Compression test- failed to reach 250 rpm

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Old 12-23-2013, 09:06 PM
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Question Compression test- failed to reach 250 rpm

Hey folks,
I was looking to purchase a beautifully well-kept 2004 8 automatic with 80k miles. Did the test drive, and from reading here decided it was a good idea to have a compression test. Have a couple questions following the results.

Results from Mazda dealership:

Rotor 1 221 rpm (failed to reach 250 rpm)
6.5 , 6.3, 6.7

Rotor 2 225 rpm (failed to reach 250 rpm)
6.1, 6.0, 6.2

Zoom clean and Starter recommended.

I was not able to speak with the tech, the service rep simply gave the results, and started talking engine replacement. I walked away from doing the deal to buy the car.

Are the low rpm's due to a weak starter? If so, and a new starter cranked to 250 is it likely the kpa/psi would be within a healthy range?

Any thoughts are appreciated.

Last edited by BullCity; 12-23-2013 at 09:11 PM.
Old 12-23-2013, 09:10 PM
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Even corrected to 250 that is low....unless you want to replace the motor and price is evident of that find another one ( with a MT )
Old 12-24-2013, 07:24 AM
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Yup, that starter is dying...along with the motor. Good that you got that compression test first, you just saved yourself a huge headache and wack to the wallet.

Always nice to see these instead of the typical: "I just bought my RX-8 last week and now I have all these symptoms of a blown engine!"
Old 12-25-2013, 07:04 AM
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Thanks folks, again reviewing the advice from posters like you is what led me to have a compression test performed. Merry Christmas!
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