Question about 1999 Mazda Pickup

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When shifting from drive to overdrive there is hesitions , speedometer goes from 55 back to zero goes back up and bounes around.

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Hello Mutt.
You have a problem in the speed sensor.
The sensor is mounted at the rear of the transmission and is turned by a nylon gear.
I suspect that you may have some worn parts in the transmission that may be allowing the gear to gear contact to the speed sensor to slip.
You could try to replace the speed sensor and the sensor gear only as the new gear may allow better contact. (The replacement sensor does not always come with a new gear)
The engine and the transmission rely on the speed sensor for proper fuel and shifting control. This is what will cause your hesitation.
Thank you for using FixYa.

KL

Posted on Nov 13, 2010

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Posted on Jan 02, 2017

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1 Answer

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I just purchased it today. The RPM's goes up to 4


You'll want to doublecheck & make sure the Overdrive is turned on. That's a high rpm for 55, even high I believe for Interstate cruising at 65-70.

Possibly get back to the dealer immediately if it's not the Overdrive switch.

There are issues with some models that concern the RPM staying around 4,000 even at idle & under the right circumstances, a transmission won't shift as it should based upon engine & driving signals that the Trans computer uses to determine when to shift.

Check your fluid first & remember, Overdrive doesn't work until the fluid reaches a certain temperature.

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