2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

7 won't run after running out of gas

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Old Jan 30, 2009 | 02:59 PM
  #26  
g14novak's Avatar
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As a last resort, try pulling off the header and turning the motor by hand with a breaker bar on the bolt on the front pulley. When the edge of the rotor comes around, make sure the apex seal is springy and all of it is there. Do this with both rotors. This will tell you whether or not you tossed seals.
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Old Feb 25, 2009 | 11:53 AM
  #27  
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I apologize for not reading the entire thread, but did you prime the fuel system as per the FSM when changing the fuel filter?
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Old Feb 26, 2009 | 02:29 PM
  #28  
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F**K THE SYSTEM!!
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WHAT ever happened? Results.. more info?
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Old Sep 15, 2009 | 10:00 PM
  #29  
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My 1986 Mazda RX-7
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when compression testing if one side of the rotor is bad would the gaudge flucuate or would it just have no compession as you are cranking it?
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Old Sep 21, 2009 | 03:14 PM
  #30  
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Originally Posted by leprachaungold9
when compression testing if one side of the rotor is bad would the gaudge flucuate or would it just have no compession as you are cranking it?
Depends on how you are doing the compression test. If you are using a conventional tester and either holding down the button on the side of the gauge or if you have removed the shraeder valve, the needle will bounce for each compression face. If you are letting the pressure build, that is, you are not holding down the button or you have not remove the valve, the needle will not necessarily bounce with each compression face "stroke".

So lets assume you are using a conventional tester and you are holding down the button or you have removed the valve, and you have good compression on all 3 rotor faces. As each rotor face compresses the A-F mixture the needle will bounce and then drop momentarily and bounce again when the next compression face compresses the mixture, and so on. You would expect to see 3 even bounces with a reasonably healthy engine. However, if one of the seals has failed or is failing, the needle will likely not bounce to the same level for all 3 faces.

See the attached images for a graphic depiction of what a good test (image 1) might look like and a test where an apex seal is failing badly (image 2).
Attached Thumbnails 7 won't run after running out of gas-chris-front-rotor-lowres.jpg   7 won't run after running out of gas-chris-rear-rotor-lowres.jpg  
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Old Sep 22, 2009 | 08:51 AM
  #31  
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Sorry, but I couldn't help but laugh when I read the title of this thread. It sounds like one of the headlines from the Jay Leno Show.
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