Help please
04-22-2014, 06:49 PM
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Help please
Just got a comp. Test done at my local Mazda dealer. Tech said the motor had been replaced at 92k miles and it has 116k. So I asked to see the results and he showed me his computer readings. The original readings for the front rotor were low 6's. Highest was 6.4 @138 rpm. But he said that his boss input the wrong number and changed it to 238. Rear rotor got mid 7's all the way across @241 rpm. Is the tech allowed to change numbers??? I thought the computer was fed the readings directly from the gage???
04-22-2014, 06:52 PM
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I would have them re run the compression test. Low 6's is a failing motor. I would want another comp test done by a different tech and i would want to watch it happen.. Get the printout bring it back here.
04-22-2014, 06:53 PM
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138rpm is impossibly too low. 238rpm sounds more right, especially with the other rotor at 241. The two RPMs should always be close, and the lowest I've ever seen is ~180rpm on an engine that was nearly impossible to start. 138rpm you would never get it started at all.
04-22-2014, 07:40 PM
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something else I noticed after having looked at the compression chart is that the tech had kfg/c..The ones that are supposed to say 6.x measurements in the box that is for KPa measurement. do techs put in the #'s or is it read by the computer??
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04-22-2014, 07:48 PM
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Oh well that makes sense. I thought the gage sent the measurement to the computer. so when I remembered seeing that the kfg numbers were in the KPa measurement I was questioning if he even did the test. thanks for clearing that up for me. lol
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04-22-2014, 07:52 PM
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Nope, it typically displays the information on the tester itself, and the tech has to transfer it:
There may be versions of the tester that connect or display in alternate scale, though I don't know any details regarding that possibility.
There may be versions of the tester that connect or display in alternate scale, though I don't know any details regarding that possibility.