Question about Mazda MPV

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My 2000 Mazda MPV has a severe hesitation problem that neither I nor the Mazda shop can fix. The V6 hesitates and sometimes backfires when attempting to do a full acceleration from a stop. I have already replaced (and mostly ruled out) 1. plugs 2.plug wires 3.coil 4.crank angle sensor 5.EGR valve 6.PCV valve 7. IMRC (Intake Manifold Runner Control) and 8.air filter restriction. Does anyone have any ideas where to look next?

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  • blairdobbie May 02, 2010

    You're right. The symptoms occur only when the engine has reached operating temperature. I guess I should start looking at temperature sensors. Do you have any recommendations?

  • blairdobbie May 02, 2010

    You're also correct about there being no check engine light on. The Mazda dealership told me that the catalytic converter may be the cause. The reason that I disregarded this analysis is that once the engine does fire on all cylinders, after the initial hesitation, it seems to have normal power. I've taken it to couple of independant muffler shops and it's their opinion that the converter is not seriously restricted, based on the flow out the exhaust.



    Although I have the official shop manual for this vehicle, it's extremely unclear about the catalytic converter. As best I can tell, there are three converters; one on each exhaust manifold and one at mid vehicle. Can you tell me how many there actually are and if one set is the more likely to need replacement? The Mazda shop gave me summary estimate of ~$2000 to replace these/this. Since this is close to the value of the vehicle I'm hoping for a cheaper solution.

  • blairdobbie May 03, 2010

    This answer confirms what I was told by the Mazda dealership. Thanks for the help.

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Does this happen when cold or only when warmed up or hot?

Posted on May 02, 2010

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  • heeman mohun May 02, 2010

    Ok...I guess you do not have any check engine light too. If this is the case then it is a high possibility of a blocked catalytic converter.When these are blocked they cannot trigger any info for the engine management to read, hence even madza or any dealer can't figure out by using any diagnostic device. Please read a bit more on the effects of a blocked converter on the internet. To summarize they cause your engine to perform less while there is an increase in temperature, basically the exhaust gas cannot excape which also cause these backfires. That is all I would say, but check the catalytic converter before you replace it.Peep inside and if you can see honey like things trapped inside then it is blocked.I hope that this clears your mind.

  • heeman mohun May 02, 2010

    My only recommendation is to check the catalytic converter since there is no error code coming back to the ECM(engine control management).

  • heeman mohun May 02, 2010

    Unfortunately there is no other cheaper alternative unless you get a good second hand from another running vehicle and test. Also there is no way any silencer specialist can tell by just checking the exhaust manually with a hand or any method unless the part is removed and visually checked inside.

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