Auto transmission Help!
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Freshman User
Joined: Sep 2007
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Auto transmission Help!
My transmission downshifts from 3rd gear to second and then right back to third gear when low acceleration through town. upon heavy acceleration on highway,no downshifting effects..shifts regularly..
Any advice would be very much appreciated.
jon
Any advice would be very much appreciated.
jon
Senior User
Joined: Jul 2007
Posts: 118
Likes: 1
From: Winthrop, Minnesota
Get or borrow or rent a OBD1 code reader and read the diagnostic codes from the transmission control computer. These will tell you the most likely problems you are having. It sounds harder than it actually is. Just follow the test instructions exactly step by step and you will be able to read the codes no problem.
Jim
Jim
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Joined: Oct 2004
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From: Fosen, Norway
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note , anytime you perform a test on this vehicle with a code reader you must hold the throttle at the wide open setting before initializing the tester or you will recieve a false code for the fipl , (tp) sensor
example , a pass would be 11-10-11 if you do not hold the throttle open you will receive
a 23-10-11 the first number is for a hard fault code the 10 is the seperator code after that any code is a memory code so 23 -10- 43 would be a hard fault fipl seperator and a memory code for the fipl
example , a pass would be 11-10-11 if you do not hold the throttle open you will receive
a 23-10-11 the first number is for a hard fault code the 10 is the seperator code after that any code is a memory code so 23 -10- 43 would be a hard fault fipl seperator and a memory code for the fipl
Senior User
Joined: Mar 2003
Posts: 205
Likes: 5
From: Marion, Kentucky
I had the same problem with both of my trucks with different causes. My 93 shifting issue was a vehicle speed sensor, which is a cheap and easy fix. This problem also periodically causes the speedometer to be unstable. Speed sensor is available at Autozone. My 91 shifting issue was caused by the TPS (sensor which all above have mentioned) on the injection pump needing adjustment.
These are the only two issues externally which will cause the problem you mention.
Andy
These are the only two issues externally which will cause the problem you mention.
Andy
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