Question about 1994 Mazda 626

6 Answers

When I drive my Mazda 626 (97) in high way, at about 110 KM/Hour speed. Sometime the tachometer will suddenly go up and come down (e.g. go up to 4000 RPM or 5000 RPM from normal say 3000 RPM in one or two seconds). Just like the car got pushed suddenly. I did not depress the accelerator when this happens. I have to lower the speed down to 80 KM/Hour, but the same problem happened again after 20 minutes drive. And have to lower the speed to 60 KM/Hour. The problem start happening after my carshop replaced my engine timing belt, and tensioner. It never happened before that. Appreciate if anyone can let me know what is the cause.

Posted by Anonymous on

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  • Anonymous Aug 07, 2008

    The motor actually runs faster when problem happens.

    My Mazda has automatic transmission.  I think the car was traveling at the same speed.  But I can feel the sudden speed drop when the tachometer dumps back.  Just like the gear got shift from high to low suddenly.

    The guy who replaced the timing belt told me that the problem may be caused by the spark plug, or fuel filter.  But after I replace all my spark plugs, I can still replicate the problem while driving on high way last night.

    Thanks for any help.

  • Anonymous Aug 10, 2008

    Hi, I checked the trans fluid level.  It is a bit high than it should be. Read an article on web.  It says the high trans fluid level may cause transmission malfunction.  My technician took some fluid out to lower the fluid level.  Not sure it will fix the problem or not.  Will let you know.

    Do you think the high trans fluid level may cause the problem I experienced?

    Thanks for your help.

  • Anonymous May 11, 2010

    The Tachometer(RPM guage) jumps, but is it just the guage, or is the motor actually revving faster?



6 Answers


Hi, countrycurt0,
My car still has that problem. It even happened tonight while I drove at speed about 30 - 40 MK/H. Should I just simply get the transmission replace?

Posted on Sep 06, 2008



Hi, Countrycurt0.
I took my car back two days ago. My technician experienced my car's problem during his testing drive in the weekend. He said the problem start happenning after 20 minutes drive, when engine and transmission got hot. It is just like what I described before. He put "Lucas Transmission Fix" into the transmission fluid, and said it may fix the problem. But the confidence level was low. From the website ( "Lucas Transmission Fix stops slipping, hesitations or rough shifting in worn transmissions.". Seems like it fit my problem very well. My technician told if my tranny will need to be replaced or rebuilt (cost the same amount of money), if the problem is still ther after 200 KM drive. Do you have any other suggestions? Thanks.

Posted on Aug 28, 2008



Hi, Countrycurt0. Thanks for asking. My car is still in the garage. I asked my technician to keep the car so they can try it out on freeway during night time. Not sure if they can replicate the problem, and find out the cause. Will definitely let you know.

Posted on Aug 19, 2008


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The problem is your ignition coil. Had same porblem.

Should fix your problem.

Posted on Aug 11, 2008


Your problem is your ignition coil. Had same problem. Your RPM will jump up and down high speed.

This should fix your problem


Posted on Aug 11, 2008

Curt Downs

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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

Posted on Aug 07, 2008

  • Curt Downs Aug 07, 2008

    ericbfu, I still think it may be a slipping tranny problem. Drive the car for at least 20 minutes, stop, with car running in park, pull out trans. fluid dipstick, wipe off with a clean rag, reinsert all the way, hold for a couple of seconds, then check where the level is on the dipstick. If your fluid level is too low, it could cause the car to do this. let me know. countrycurt0

  • Curt Downs Aug 19, 2008

    ericbfu, I am wondering if you have discovered what the problem is with the Mazda yet. Hope it's fixed, if not, any other symptoms to report? countrycurt0


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