Question about 1992 Mazda MPV

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92 mpv 3 liter loses injector pulse at @ 2000rpm

I have tried different ecm,maf,tpf and distributor

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  • dancroghan Jan 15, 2009

    I put a node on injector. Raise rpm to @ 2000 rpm, node stops flashing loses rpm's. Node starts flashing again. Almost like surging,off,on,off,on. Have tried known good ecm,maf,tps& distributor.No fix

  • Colin Stickland
    Colin Stickland May 11, 2010

    dump it and buy a home made car ,remember the burma railway???

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  • Expert
  • 53 Answers

What it seems to me if your losing injector pulse is
-crank sensor
- or communication BUS between the ECU/PCM

-why crank sensor because it gives a signal for when that tells the PCM when
it should send fuel

-BUS communication because if its not getting a good signal then it doesn't know where
the crank is in position to the camshaft

Posted on Mar 28, 2009

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Well good job my old uncle isnt alive,he used to set light to japanese motors and bike in the early sixties,got took to court and the judge was an ex POW as well .Anyway this isnt helping you ---right first of all a physical check of the sensor and the operating mechanism,ie the pick up for induction sensor is their anything loose on whatever its picking up from ??you have changed the sensor i take it ??right only other posibility is a speed govenor control on this vehile that you are not aware of ---like a cruise control but its not ,it limits speed for when the kids drive the car .seen this on a renault as it got me i had to drive it 50km with speed limited to 80kms never knew it had this knob thingy ,ask in the dealers bet they know where it is or if it was fitted with one

Posted on Jan 15, 2009

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Actually the injectors don't spray "all the time". They pulse open for a few milliseconds then close every time they are grounded by the ECM. The distributor has a pick-up coil (Variable Reluctance sensor) that provides an A/C (Alternating Current) pulse every 120 degrees of crankshaft revolution to the Ignition Control Module also contained inside the distributor. The I.C.M. amplifies, rectifies and passes along the pules as a +12V square wave to the ECM. The ECM uses these pulses to calculate RPM and determine when the engine is rotating vs. stopped. Together with this information and more from Coolant Temp., Throttle Position, Manifold Pressure and Air Temp. the computer constantly 'looks up' what the appropriate amount of time it should pulse the injectors for to deliver the required amount of fuel.
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http://www.avproecm.com/mazda.htm

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Most likely the ignition module that is inside of the distributor is faulty, or there is a damaged or grounded wire between the control module and the control unit. If there is no problem to be found with the ignition module inside of the distributor or with the wiring between the control module and the ignition module inside of the distributor, then the problem will be with the electronic control module itself. Also, check all of the fuses to the ECM.

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