Question about 2007 Mazda B4000

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Misfiring when accelerating at highway speeds in fifth gear

Happens at low revs, also rough idle.
Cleaned mass airflow sensor, trottle body, checked fuel pressure. Also did the obvious plugs , wires, and fuel filter.
tried high octane gas
The problems occured 3 days after putting fuel injector cleaner in the tank. Maybe this was just a coincidence?

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  • Anonymous Apr 11, 2009

    i have the same problem. ive put in new sparks +2 type, wires, egr, mass flow, throttle sensor, o2 sensor, temp sensor, and its still idle bit rough when its parked and misfirin a few times, also when im drivin along the interstate im gettin the jerks, as well the speed gradually boost in.



    when ur driving along the interstate look at ur rpm and see if it changes rpm when its rough idleing, or driving. if the rpm has changed then its not gettin the sparks. If the rpm stayed the same while the engine is jerking, or rough idleing its comin from the egr's system, mass flow or the fuel filter.



    ive been lookin though the websites, and discovered that the mass flow, throttle positioner, egr, and fuel filters are the main problem for 94 mazda b4000's, as well with the rangers, and explorers on the same year. the dealers, and manufactuers already know about the problem but not willing to do anything about it. im still on the hunt to find the solution to solve the problem so i can get the idle to where it was before it occered. been lookin up the problems from the internet, manual books, repair books as well.

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It could be a couple of things.
1) Check to make sure the wires are in the correct firing order.
2) Check to make sure th plugs are still good, including the gap.
If these don't work than you should probably have a mechanic look at it in person.

Posted on Feb 13, 2009

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