Auto Trany Down Shift - NoPistons -Mazda Rx7 & Rx8 Rotary Forum
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2nd Generation Specific 1986-1992 Discussion

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Old 03-24-2003, 10:21 AM   #1  
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Got to put the pedal all the way to the floor to get the down shift. I checked the vac sensor and it changes voltage when a vac is applied. I don't if it is calabrated though. Any Ideas???
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Old 03-24-2003, 10:38 AM   #2  
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i have an auto tranny im going to convert to 5spd in mid april. Are you interested in buying an auto tranny just in case ures blow up

?
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Old 03-24-2003, 11:07 AM   #3  
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that might be set correctly. most automatics make you floor it to downshift



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Old 03-24-2003, 05:43 PM   #4  
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yeah check out the automatic lol.. ughhh
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Old 03-24-2003, 08:28 PM   #5  
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damn..... my AT Will not shift from 2nd to 3rd when warmed up and it downshifts at way to high speed and rpm's the motor to 7500 + how/ where is the vac sensor to test it... any threads on testing procedure? Not trying to highjack your thread but maybe our problem is related.
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Old 03-25-2003, 06:24 AM   #6  
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There is a little black box (1" by 1") mounted on the passenger side of the car near the airfilter. It has a vac and wire connector. My haynes manual says it is for the Auto trany. Need a vac guage to test it correctly but I just hooked up a vac hose and a volt meter and suched on the hose and watched the voltage change. I'll double check all this with the manual that is in the car.
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Old 03-25-2003, 07:02 PM   #7  
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ok thanks for the info.... If I where able to bypass this box would I be able to control upshifts/downshifts?
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Old 03-25-2003, 08:55 PM   #8  
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Check the modulator valve on the side of the tranny, if it is bad or not adjusted, your car will shift too hard or not at all. There is a screw valve inside adjusted by a screwdriver. If you take the vacuum line off and aft comes out, change it. Also check to make sure the vacuum line running back to the engine bay is not cracked or pinched. This is what caused my problems. Good luck.
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Old 03-25-2003, 10:19 PM   #9  
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any info on how to adjust it.. all I have for specs is a paperwieght hayes manual. Thanks for the help!!!!
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Old 03-25-2003, 10:52 PM   #10  
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I can't remember, is this tranny also control by cable at the throttle or by the computer?



Some car have a wire form teh throttle body to the valve train in the tranny that controls the shifting, adjusting this wire can change the way the tranny shifts. I'm not sure the rx7 tranny has this?



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