I have Mazda 626 v6 1997, When I drive my car like 40km/h then my car RPM is go to high appox. 3-4, when I give the speed mor so some fuel burn then car change the gear and suddenly catch the speed. so let me know what is the problem.
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check clutch for slipping condition,mayb due to worn clutch disc or a oil contaminated disc or a weak pressure plate not locking disc to flywheel therefore giving u a slipping condition and higher than normal rpms
Make sure you have the trany in "D" (drive) and not in a lower gear like 1,2 or 3. Some models must be in "econo" (not "power") setting for the trany to shift at a lower rpm. It will also get in overdrive sooner.
Most likely, if it's anything like my old Mazda MX-3, the Mazda engines are VERY sensitive to airflow on the intake side. There is possibly a crack in the airbox or intake plenum (sometimes hard to spot if they are in a "bellows" portion), or not latched in place properly or improper airfilter. Give those a look, looking is free, fixing can be pricey, Mazda wants a lot for a little bit of formed plastic, just to warn you.
My '91 626 did the same thing. I tested the throttle position sensor, and it was good so that wasn't it. The other likely culprit is the Idle Speed Control valve, or Idle Air Control valve, which is a $500 part new (more than I paid for the whole car). I pulled one off a 626 at the salvage yard and got it for 3 bucks, put it on (it's an easy DIY, just 4 philips screws holding it to the intake manifold), however I can't be sure that solved the problem, since I haven't run the car much since then. It would seem the most likely cause, tho, and a cheap fix if you go used. Other possibilities: O2 sensor or Mass Air Flow sensor?
Does your Mazda have a standard trans (clutch), or automatic. If it's automatic, the tranny might be slipping, and if it's a standard shift the clutch may be slipping. Does the actual driving speed (not engine rpm's) seem to stay the same when this happens? If you are still traveling at the same speed even though the engine speeds up, it's your tranny or clutch. I don't think the timing belt and tensioner have anything to do with this. countrycurt0
my 1988 mazda 626 starts okay then dies everytime it idles down to normal idle speed. i replaced the throttle control sensor and the mass air sensor. i replaced the rotor in the distributor but is still dies. if you throttle up to about 1500 rpm it keeps running. any ideas???