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Shifting problem

S

sportracer

CEG'er
Joined
Dec 30, 2002
Messages
285
Location
Oshkosh, Wisconsin
I have a 1998 mystique with a 2.5 auto. It doesnt sound like it wants to shift gears, when out in gear I can drive for about two to three seconds and get up to about 2000-2200 rpms then all of a sudden it drops to like 1000 and wont give any more power until you let off the gas and let it sit for a sec and then push again. I checked the fluid level and its good and the check engine light came on, so I had it read and came up with these two codes: p0750 (Shift A soleniod fault) and p0755 (Shift B soleniod fault). Anybody have any clues as to whats going on. I should add in that the speedometer doesnt work either. Please someone help out I need this fixed so I can drive!
 
This has happened to several folks. Not totally uncommon with the CD4E. If I remember it is caused by a faulty transmisson speed sensor.

I suggest you do a search on the general problem and I am sure you will find the answer.

Merry Christmas,
AF
 
sportracer said:
I have a 1998 mystique with a 2.5 auto. It doesnt sound like it wants to shift gears, when out in gear I can drive for about two to three seconds and get up to about 2000-2200 rpms then all of a sudden it drops to like 1000 and wont give any more power until you let off the gas and let it sit for a sec and then push again. I checked the fluid level and its good and the check engine light came on, so I had it read and came up with these two codes: p0750 (Shift A soleniod fault) and p0755 (Shift B soleniod fault). Anybody have any clues as to whats going on. I should add in that the speedometer doesnt work either. Please someone help out I need this fixed so I can drive!
Click to expand...

Speedometer issue, change the (VSS) vehicle speed sensor and then change the ATFluid.
http://www.contour.org/ceg-vb/showthread.php?t=9842&highlight=vehiclespeedsensor

As for the other two codes, if changing the VSS does not take care of it, you may need a tranny rebuild.
 
Last edited:
I looked under the car to find the vss sensor, but where i saw it in the picture (Just behind the pas. driveshaft and to the passenger side of the filler tube) All i have there is a white cap. Where is the vss sensor if i have one and how do i fix this problem. I see no extra wires that would go to that area so whats going on.
 
I should add that everything is a 98 except for the engine/trans/engine wiring harness, those three are from a 99. Is there a difference between 98 and 99, does the 99 not have a vss sensor.
 
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