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Originally Posted by MTHiker
Thanks. The codes were checked using a hand held scanner. Here is the most interesting thing, if I take off the overdrive, the surging stops. Could this be some kind of electrical problem connected to the major engine work of replacing the knock sensor? As you indicated a throttle position problem? The scanner indicated the the knock sensor was going bad back in August. The power continually diminished over time so we thought it was time to replace the knock senor.
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The mechanic must have cleaned the MAF (Mass Air Flow sensor). When you look at the air cleaner housing do you see the air filter element? Reason I ask this is that these earlier Villagers are known for the housing to warp exposing the filter element thus the MAF is getting unfiltered air which is contaminating the sensor causing improper air flow and causing your lack of power. Thus the cleaning of MAF sensor has improved the power issue.
Have you had the codes rechecked since the Knock Sensor replacement?
Yes it is possible that a wire is not properly connected or loose, double check all connecters.
Usually a knock sensor code is triggered by another code which is the cause of a vibration of some sort in the engine that the knock sensor detects and sets a knock sensor DTC.
Sounds like the torque converter lockup is not working properly when in overdrive.
Again check for DTC codes and post them and will go from there.