Question about Mazda B2600

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4x4 ute starts, idles, revs fine, but while driving, acceleration above 2500revs the cars jumps and hops and i have to take foot off accelerator

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  • plre Aug 07, 2008

    Thanks mmptruck, its in 2wd, I think its a fuel thing, probably carby, maybe pump. Ive put a new fuel filter on and blown the lines. It revs freely in neutral and 1st, pretty good in 2nd, but backfires as the revs get up, in 3rd and 4th can really only idle along. Any acceleration and the car jumps hops and has a tantrum. the carby looks a bit complicated and daunting. I'll do the plugs today and take it from there. Any advice would be much appreciated.

  • plre Aug 08, 2008

    I put new plugs in today. the problem is still there, but it did improve slightly. Enough improvement to think of moving along the electrical line, ie: leads, distributor, coil. So your pointer (mmptruck) is an excellent idea and worth me looking at, and something I did not know about and would not have thought of looking for. As for symptoms, it was sudden, and not a slow denigration, and basically the car runs poorly only when the motor is under load (higher gears) It feels like it is flooding, or as if it is running with the choke on full.


  • plre Aug 08, 2008

    oh, Its a 2.6 ltr petrol, with points. In the back of my mind I still think its a carby problem, but I am not sure. I dont understand why it would idle smoothly and run well in the lowest gears without missing. But I will keep moving along the electrical line, and check the dist earthing wire.
    thank you.


  • Anonymous Jan 26, 2009

    I have exactly the same ute and problem. I run it on petrol and gas and the problem exists for both so I doublt its, fule line, fuel filter, or fuel pump. I think it has something to do wiotht the points or coil.



    Check for a strong blue coloured spark on the spark plugs.

  • March Palone
    March Palone May 11, 2010

    Is it stuck in four wheel drive?
    Is it speed related or only revs?
    Does engine sound like it is not running on all cylinders?


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Check if your vehicle uses points in the ignition, if it does they sometimes break the earthing wire inside distributor advancer plate (Where the points screw onto)
This gives the symptom you describe.
Sorry but it difficult to be more accurate in diagnosing the cause of your problem without a very detailed description of whats happening.
All the best MMP

Posted on Aug 08, 2008

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