pgmtry Posted August 28, 2022 Report Share Posted August 28, 2022 I apologize if this topic already exists on this forum--please redirect me if needed. Searched but didn't come across one. I have a 2020 Edge ST with 30K miles. Five months ago during a road trip I began to notice a subtle lag/jolt and wood-like 'thunk/knock' when coasting between 10 and 15 MPH and gently pressing the gas to maintain speed (10-15 MPH). Occurred only in this range--low RPM, low speed. As the months have gone by, this issue persisted--I've developed the ability to trigger it consistently--at low speed/RPM. The last few weeks the issue (lag/jolt and thunk/knock) now appears occasionally when rolling to a stop--occurs about a half second before a full stop. Also appears occasionally in the 35 MPH range. I took the ST into a Ford dealership two weeks ago and was referred to their service advisor who was said to have considerable transmission experience. He had the transmission software reset and asked me to drive the car normally for several days and see what develops. Unfortunately, the issue remains. He asked me to bring the car back if things didn't change, so I intend to see him later this week. Anyone have any thoughts/ideas/recommendations? Many Thanks! Quote Link to comment Share on other sites More sharing options...
Fingernip Posted August 29, 2022 Report Share Posted August 29, 2022 I had something somewhat similar with mine. It bucked under light acceleration and turned out to be converter lockup failure. They disabled TC lockup and test drove it to prove it out and the bucking was gone. Ended up getting a new torque converter and problem solved. Quote Link to comment Share on other sites More sharing options...
MLTEdge Posted August 29, 2022 Report Share Posted August 29, 2022 I also experienced this on my old Titanium. My bucking was at slightly higher speeds, 45 range. Dealer kept telling software issue, finally took to another dealer who confirmed TC and replaced along with a complete transmission rebuild since it took 49k miles to properly confirm. Transmission was burned up. I became proactive to fix since warranty was about up. Just like you found myself driving differently to avoid kick so I could live with it. Quote Link to comment Share on other sites More sharing options...
ILLIA Posted March 19 Report Share Posted March 19 On 8/28/2022 at 3:16 PM, pgmtry said: I apologize if this topic already exists on this forum--please redirect me if needed. Searched but didn't come across one. I have a 2020 Edge ST with 30K miles. Five months ago during a road trip I began to notice a subtle lag/jolt and wood-like 'thunk/knock' when coasting between 10 and 15 MPH and gently pressing the gas to maintain speed (10-15 MPH). Occurred only in this range--low RPM, low speed. As the months have gone by, this issue persisted--I've developed the ability to trigger it consistently--at low speed/RPM. The last few weeks the issue (lag/jolt and thunk/knock) now appears occasionally when rolling to a stop--occurs about a half second before a full stop. Also appears occasionally in the 35 MPH range. I took the ST into a Ford dealership two weeks ago and was referred to their service advisor who was said to have considerable transmission experience. He had the transmission software reset and asked me to drive the car normally for several days and see what develops. Unfortunately, the issue remains. He asked me to bring the car back if things didn't change, so I intend to see him later this week. Anyone have any thoughts/ideas/recommendations? Many Thanks! Hey, I have a similar problem as you, absolutely everything is as you described above. Appeared literally a week or so. Have you figured out what the problem is? Quote Link to comment Share on other sites More sharing options...
Fingernip Posted March 20 Report Share Posted March 20 At around 45k miles mine developed a pop noise similar to what the OP described. It sounded like someone tapping an empty soda bottle on the ground. It occurred when coming to a stop or lightly accelerating. I could reproduce it easily at low speed and sometimes even on the highway. Dealer claimed it was a loose axle nut. It stopped for a week and started again. Never figured it out. Quote Link to comment Share on other sites More sharing options...
Cerberus Posted March 21 Report Share Posted March 21 these noises sound like they could be driveline lash going from one state to the other. loaded to unloaded or the other way around, like from a down shift/upshift that could be caused by the engagement or disengagement of the rear drive. just a guess Quote Link to comment Share on other sites More sharing options...
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