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Discussion Starter · #1 ·
Hi, I have an issue with my automatic transmission. The revs go up and down when I am going on a constant speed. Can anyone let me know what could be the issue please? Have changed the torque converter but the problem is still there.
Additional Info:
1- Car idles fine. No bouncy revs
2- Only happens under steady load (No acceleration or deceleration. Foot steady at the accelerator pedal) . When I accelerate, revs don't bounce and the TC does not slip
3- Does NOT happen when cold. Only when the engine is slightly warmed and so on
4 - Current faults are 1) 41BB-exhaust backpressure sensor and 2) 4A74-LIN/BSD Preheating control unit:Missing

Here is what it looks like:
 
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