Question about Mazda RX-7

4 Answers

Cant get mazda rx-7 to start

Dont have any spark on the #2 side of leading ccant figure this out.oil ,or any spark on either of the trailing coils.

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  • unclehaney Aug 05, 2008

    yes please,more help. I have checked battery,replaced mass air sensor,replaced crankanglesensor,replaced ecu,replaced plugs, wires,replaced fuel injectirs. it will try to start .but dont think i have enough spark.

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4 Answers

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  • Master
  • 6,966 Answers

Hi,

RX-7s are not very common in my country. But with your indulgence, would like to add. Based on my understanding and initially, pls check:

  • on both the leading ignition coil and the trailing ignition coil, please check for the presence of +12V with the ignition key switched to ON but not start. This would be on the black with yellow stripe wire;
  • on the leading ignition coil,please check for the presence of pulsating +12V with the ignition key to START (cranking the engine). this would be on the green with yellow stripe wire;
  • on the trailing ignition coil,please check for the presence of pulsating +12V with the ignition key to START (cranking the engine). this would be on the blue with yellow stripe wire. There would be two of these wires;
  • both the green with yellow stripe and the two blue with yellow stripe comes from the ECU;
  • there would be other wires to check for pulsating B+ while cranking. They are;
  1. brown with yellow stripe
  2. blue with red stripe
  3. yellow with blue stripe
Incidentally, you may want to reference this page for more information.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Aug 05, 2008

  • Louie  Role
    Louie Role Aug 05, 2008

    Hi again,

    You might be better off using an analog voltmeter (rather than a DVM) when checking the voltages.


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  • Master
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You list a number of things that you've changed, and I saw mention of the coil packs, but not that you had done anything to them.
Also how are you testing it for spark?
Have you done a compression test on the motor?
Also, is this motor completely stock, or has it had any modifications? And how many miles on the car?


Posted on Aug 05, 2008

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  • Master
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Start by getting the fuel system pressure checked out and also have the computer checked for code/s also. moreover, check this link too. http://www.all-parts.com/diagnostics/mechanics/Mazda-RX7.html regards,

Posted on Aug 05, 2008

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  • Master
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  • have you checked your batteries?
if not please check it..

Posted on Aug 05, 2008

  • dewan nafees ahmed Aug 11, 2008

    Egr valve is a problem on these cars, but so are spark plug wires hooked up in the wrong order.....

    'I' for intake and 'E' for exhaust.....marked on the cap

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1 Answer

Firing order 84 madza rx7


If your tach does not work that is a symptom. Of course a timing light is most useful. If not you can coil wires (swap with known good wire) ; check ignitor,(swap trail/lead ignitor plugs at distributor) coil, check with ohm meter.
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If it's over 170K it might just be super low compression that's the culprit. To find out I'll teach you the rotary engine mechanics secret weapon. Take out both the trailing plugs their the T1, and T2 plugs respectively. Now turn the engine by hand slowly watching the spark plug holes when you see an apex seal go by squirt a little transmission fluid into the plug hole, about 3 cap fulls is usually good enough. do this for both rotors remember there's 3 sides to each of them. Now just to be sure take the leading plugs out and spray them with carb cleaner to be sure they fire the first time around. Put all the plugs in their correct places, check the wires to be sure the leading coils and trailing coils are connected to the proper plugs. Then crank it over! If it runs like a brand new engine then its just worn out apex/side seals. This trick is also a great way to get rid of the carbon build up on the faces of your rotors. Hope that helps!

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