2004 Mazda RX-8 Logo

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gussie doucet Posted on Oct 22, 2011
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Mazda RX 8 was running parked it overnight and will not run. Change the coil pack and spark plugs. It still will not start. If you think it could be the fuel filter tell me where its at or any other info would be so appreciated. Thanks

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Brad Kirby

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  • Posted on Oct 23, 2011
Brad Kirby
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I would like you to verify spark. You can get a spark tester from a local part store for less than $10. Just pull the coil off of a spark plug, put the tester in the coil, ground the coil with the clip to a clean metal surface (preferably the block), and have someone try to start the engine. Only turn the key long enough to see if you have spark at the tester, shouldn't be more than a few seconds. If you have spark, put the coil back on the plug in the engine, spray some starting fluid in the air intake and see if the engine tries to start on the fluid. If it does, then we can be mostly certain you have a fuel issue. Let me know the results of the test. You can try spraying the starting fluid before you do the spark test. If the engine doesn't try to start on the fluid, then you need to do the spark test.

  • Brad Kirby
    Brad Kirby Oct 23, 2011

    I forgot to mention, the fuel filter is not serviceable. The filter is built into the fuel pump module inside the fuel tank. In order to replace the filter, you have to replace the pump. I hate when manufactures do this and I hoped Mazda would be smarter than this. Also, there is a chance your fuel gauge is not working or not working properly. Someone may have stolen your gas as well. It wouldn't hurt to pour a couple of gallons in to make sure that isn't the issue.

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After doing some research there is a high probability that one of the coil packs is bad and isn't making a good connection after enough heat is transmitted between the coil pack and the spark plug. Heat expansion will cause the coil pack to not create the proper amount of voltage and spark. You might also find an improper gap on a spark plug increased voltage being required to create a spark in the chamber.
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I changed all four plugs and all four coil packs which cost me around 30 per plug and 80 per coil pack. If you call around you will get these prices, however mazda charge over double so do not go there!

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Please try to jump start the car as the car left long will have drained battery , and get the battery checked .........


Good luck...
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