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Highway speed acceleration 2 part question 700

posted by  yeoville on  Sun Dec 4 11:33 CST 2005
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last visit: Mon Oct 13 15:51 CST 2014
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My son has a '85 740 that won't accelerate via the kick down on the transmission at highway speeds. Around town the transmission shifts smoothly upon hard acceleration the car will drop down one gear and then speed up. However at highway speeds the car doesn't drop a gear and accelerate. It slowly gains speed and will increase speed up to 75 - 80 miles per hour. The gas pedal is to the floor. There is no sputtering or rough running of the motor, and no slippage of the transmission. Fluids are all OK and no burned smell. Transmission has 140 k on it. Anyone had this symptom?
The ECU last three are 511. the AMM last three are 007. I was wondering if a ECU with a different last three from a newer '80s car would be interchangable without any problems? 541 544 554? Thanks for any help, Doug





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