Question about Mazda B-Series Truck

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I have a rough idle in a truck I just bought it's a 1984 Mazda sun downer pick-up any ideas where to start?

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Plugs, wires, distributor cap, rotor, Timing in that order.

Posted on Jul 18, 2010

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Free online auto repair manuals


Did you use factory spark plugs? Try cleaning the throttle body.

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Running rough


Did you check the timing? And how about timing advance?Water in tank from bad fuel? - happens all of a sudden - I think it is that based on description of what happened.

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Too many possibilities

Won't turn over is one problem -battery,cables,grounds,
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Worn O2 Sensors
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Replace your fuel filter first, cheap and easy to rule out, probably needs it anyways. Could also be a massive vacuum leak. On that year's carb there are 2 adjustments... Here's a page on idle tuning: http://sterlingmetalworks.com/tuning_the_nikki.htm

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I had a 96 GMC 1500 with a 5.7 ltr. It would idle rough, especially on start up. After replacing everything under the sun, it turned out the ECM (computer) was shot. I found a used one and plugged it in and it ran fine. I think I paid 50 bucks or so for it. If you know someone with a truck like yours, plug theirs in and see if it fixes it.

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power=ign. on/run
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1 Answer

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check the fuel filter air filter and vacuume lines if they all good make sure the spark plugs are making a bright blue spark

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