Auto Transmission jerk, surge, stutter t low RPMs
#1
Auto Transmission jerk, surge, stutter t low RPMs
Hi guys,
Ive got a 2010 automatic S. As I described the car jerks, hesitates, stutters when shifting. This is really only an issue when accelerating and decelerating up to 2000 rpms. Once the RPMs reach 2000 and are constant I don't feel much jerk....I feel the jerk behind the drivers gas peddle. I just replaced an intake boot that was leaking (however no code was present?). I have not smoke tested again to confirm all leaks are gone. I have oil? (green fluid) on my transmission bell housing which some people say is from a leaking vacuum pump, more specifically the O-ring? Wondering if this is a vacuum issue causing the automatic trannny to get out of whack.
I have a mini/bmw scanner and the only fault i read from the transmission is EGS switch steptronic not working.
I have had my timing chain assembly replaced already. Car is at 55k
Wheel speed senors all read correctly.
thanks Bob
Ive got a 2010 automatic S. As I described the car jerks, hesitates, stutters when shifting. This is really only an issue when accelerating and decelerating up to 2000 rpms. Once the RPMs reach 2000 and are constant I don't feel much jerk....I feel the jerk behind the drivers gas peddle. I just replaced an intake boot that was leaking (however no code was present?). I have not smoke tested again to confirm all leaks are gone. I have oil? (green fluid) on my transmission bell housing which some people say is from a leaking vacuum pump, more specifically the O-ring? Wondering if this is a vacuum issue causing the automatic trannny to get out of whack.
I have a mini/bmw scanner and the only fault i read from the transmission is EGS switch steptronic not working.
I have had my timing chain assembly replaced already. Car is at 55k
Wheel speed senors all read correctly.
thanks Bob
#3
+1 on above advice. Vacuum pump is very easy to change, and you can get one for around $100. Good preventive maintenance at your mileage, regardless of need.
Also, search the forums on changing auto tranny fluid. You will see how to check level. I would agree that it sounds like it's low to me. I dropped the pan & changed my filter at 65k. I found it a tedious process, but not too technically challenging.You might want to consider tackling that, too.
Also, search the forums on changing auto tranny fluid. You will see how to check level. I would agree that it sounds like it's low to me. I dropped the pan & changed my filter at 65k. I found it a tedious process, but not too technically challenging.You might want to consider tackling that, too.
#5
Already replaced thermostat housing? Any other common leak points?
Is the Steptronic Selector Switch the same thing as the transmission position switch? I would think they would rely on the same switch to adjust the gearing in normal and paddle shifting mode? I am getting a fault on the STEPTORONIC Switch and think they maybe related?
https://www.ecstuning.com/b-genuine-...h/24157551089/
Is the Steptronic Selector Switch the same thing as the transmission position switch? I would think they would rely on the same switch to adjust the gearing in normal and paddle shifting mode? I am getting a fault on the STEPTORONIC Switch and think they maybe related?
https://www.ecstuning.com/b-genuine-...h/24157551089/
#6
Steptronic issues
Already replaced thermostat housing? Any other common leak points?
Is the Steptronic Selector Switch the same thing as the transmission position switch? I would think they would rely on the same switch to adjust the gearing in normal and paddle shifting mode? I am getting a fault on the STEPTORONIC Switch and think they maybe related?
https://www.ecstuning.com/b-genuine-...h/24157551089/
Is the Steptronic Selector Switch the same thing as the transmission position switch? I would think they would rely on the same switch to adjust the gearing in normal and paddle shifting mode? I am getting a fault on the STEPTORONIC Switch and think they maybe related?
https://www.ecstuning.com/b-genuine-...h/24157551089/
#7
Same switch for the gen 1 Cooper S Auto and the gen 2.
Possible the switch has a bad internal contact. Only another thing is the shifter itself. 25167550008
https://www.ecstuning.com/b-genuine-...c/25167550008/
Easier to replace the switch first.
Possible the switch has a bad internal contact. Only another thing is the shifter itself. 25167550008
https://www.ecstuning.com/b-genuine-...c/25167550008/
Easier to replace the switch first.
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Milltek | Genuine MINI | Forge Motorsport | NM Engineering | ECS Performance | M7 Speed
Customer Service Hours: 8am-8pm EST|Sales Team Hours: 8am-11pm | SAT 10am-7pm 800.924.5172
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