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MAZDA tune-up help

Discussion in 'Trucks and Trailers' started by Varsity L&G, Sep 26, 2005.

  1. Varsity L&G

    Varsity L&G LawnSite Senior Member
    Messages: 418

    OK, the truck was running fine other then a little hesitation when over 3/4 throttle.

    So i decided to do a tune-up.
    replaced: air filter, plug wires, plugs, fuel filter, dist cap, rotor button, coil.

    Now the truck barely runs, lucky if it starts. Have replaced the plugs and wires twice now with different brads and double even triple checked the gaps.

    Here is the odd thing. All plugs are firring, but when I unplug either 2 or 4 nothing happens, but when I unplug 1 or 3 the engine shutters and dies.

    Timing is Good, and coil was not replaced until after the tune-up and the problems had started. I have swapped everything out for the old stuff except for the plug wires and still same issue. I returned wires for another set different brand still no luck.

    ANY IDEA's
  2. Dirty Water

    Dirty Water LawnSite Fanatic
    Messages: 6,794

    I believe its possible to put the distributor rotor on 180 degrees from its correct location on those trucks.

    Double check that.
  3. Varsity L&G

    Varsity L&G LawnSite Senior Member
    Messages: 418

    Thought that might have been the issue as well. I have check that with both the new and old button.
  4. hosejockey2002

    hosejockey2002 LawnSite Bronze Member
    Messages: 1,195

    Have you checked to make sure the firing order is correct? It sounds like it's just running on 1 and 3.
  5. Varsity L&G

    Varsity L&G LawnSite Senior Member
    Messages: 418

    Yes, I think it is 1-3-4-2. I have checked it several times. Will be checking it again when I get home tonight.

    I agree it acts like it is only firing on 1 & 3.
  6. lawnmaniac883

    lawnmaniac883 LawnSite Silver Member
    Messages: 2,613

    Maybe the dist cap assy is loose sitting on top of the engine, make sure the timing is set correctly and tighten those bolts.
  7. topsites

    topsites LawnSite Fanatic
    Messages: 21,653

    On that note I think it's more likely 2 of the wires are crossed, heh

    Being that it's a 4-cylinder, the most common config is 4-1-2-3 but no it's not the only one. So let me see:
    hmmm.... well there's NO correlation there.
    By the way, how about The spark plug gap should be 0.039 - 0.043 inches (1.0 - 1.1 mm). I got that from:
    Where it agrees it is 1-3-4-2...
    Check it out, guy's got pics and all...

    You COULD, since suspect it's only running on 1 and 3, reverse 2 and 4 wires at the plug and see what happens but check the gap and read that page at thinkythings, maybe that helps.
    Worth a shot to then crank it and see, then go back to square one if no improvement before it skru's something up royal.
    Good luck.
  8. Varsity L&G

    Varsity L&G LawnSite Senior Member
    Messages: 418

    Problem solved.

    I had the 2 & 4 plug wires reversed.

    Thanks guys.

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