F55/F56 Rough idling cold start with engaged gear
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Joined: Sep 2021
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From: Germany
Rough idling cold start with engaged gear
Hello screwdriver community.
I have a problem with my wife's Mini F57 Cooper S.
If the car has been standing still for more than 2 days, it sometimes gets into an uneven engine idle during the cold running phase as soon as the automatic selector lever is set to R too early. I would describe a normal short-term drop in idle speed as completely normal, owed to the frictional torque of the cold oil in the gearbox or in the converter.
But despite the fact that the selector lever is set to P or N, the engine does not immediately come out of the lower rev range to normal idling speed. On the contrary, the speed drops even further, probably due to the specified motor speed, which is a little lower at P or N.
The funny thing is, it doesn't always happen! If the car is stationary for a day, the oil and water have, according to the tester, 17 degrees and it starts normally.
The fault memory of the engine control unit is empty. At first I thought of a defective ignition coil. I tested them all with the help of an inductive sensor while the engine was in the lower rev range. The result is that all ignition coils have an ignition spark. Then I thought that maybe due to thermal reasons, the output of one or the other ignition coil is too low. So I packed all 4 ignition coils in the freezer for one day with the result that the engine started perfectly. Next I organized an orig. BMW tester and had the misfiring service module processed, which also tested the injectors and also there, no error in the result. Then I suspected a dirty or stiff throttle valve, but even there, everything is clean and the service function for controlling the throttle valve is processed without errors. The intake manifold and inlet ducts are also not coked or excessively sooty.
We bought the car about 1.5 years ago with only a few kilometers, my wife drives 62 kilometers across the country every day. So I would also rule out driving behavior as a reason.
I almost guessed that the torque converter lock-up clutch was defective, but with P or N the error gets even worse.
Does anyone have any ideas before I start to swap things senselessly?
Please excuse my bad English, greetings from Germany
Key data about the vehicle: Mini F57 VFL, Km 36,000, Mod 2016 EZ 2017, engine B48A20M0, I-Stand F056-16-07-502
Ignition coils have part no.8678438
Youtube Video
Thank you for your help.
I have a problem with my wife's Mini F57 Cooper S.
If the car has been standing still for more than 2 days, it sometimes gets into an uneven engine idle during the cold running phase as soon as the automatic selector lever is set to R too early. I would describe a normal short-term drop in idle speed as completely normal, owed to the frictional torque of the cold oil in the gearbox or in the converter.
But despite the fact that the selector lever is set to P or N, the engine does not immediately come out of the lower rev range to normal idling speed. On the contrary, the speed drops even further, probably due to the specified motor speed, which is a little lower at P or N.
The funny thing is, it doesn't always happen! If the car is stationary for a day, the oil and water have, according to the tester, 17 degrees and it starts normally.
The fault memory of the engine control unit is empty. At first I thought of a defective ignition coil. I tested them all with the help of an inductive sensor while the engine was in the lower rev range. The result is that all ignition coils have an ignition spark. Then I thought that maybe due to thermal reasons, the output of one or the other ignition coil is too low. So I packed all 4 ignition coils in the freezer for one day with the result that the engine started perfectly. Next I organized an orig. BMW tester and had the misfiring service module processed, which also tested the injectors and also there, no error in the result. Then I suspected a dirty or stiff throttle valve, but even there, everything is clean and the service function for controlling the throttle valve is processed without errors. The intake manifold and inlet ducts are also not coked or excessively sooty.
We bought the car about 1.5 years ago with only a few kilometers, my wife drives 62 kilometers across the country every day. So I would also rule out driving behavior as a reason.
I almost guessed that the torque converter lock-up clutch was defective, but with P or N the error gets even worse.
Does anyone have any ideas before I start to swap things senselessly?
Please excuse my bad English, greetings from Germany
Key data about the vehicle: Mini F57 VFL, Km 36,000, Mod 2016 EZ 2017, engine B48A20M0, I-Stand F056-16-07-502
Ignition coils have part no.8678438
Youtube Video
Thank you for your help.
Neutral
Joined: Sep 2023
Posts: 1
Likes: 0
Hello screwdriver community.
I have a problem with my wife's Mini F57 Cooper S.
If the car has been standing still for more than 2 days, it sometimes gets into an uneven engine idle during the cold running phase as soon as the automatic selector lever is set to R too early. I would describe a normal short-term drop in idle speed as completely normal, owed to the frictional torque of the cold oil in the gearbox or in the converter.
But despite the fact that the selector lever is set to P or N, the engine does not immediately come out of the lower rev range to normal idling speed. On the contrary, the speed drops even further, probably due to the specified motor speed, which is a little lower at P or N.
The funny thing is, it doesn't always happen! If the car is stationary for a day, the oil and water have, according to the tester, 17 degrees and it starts normally.
The fault memory of the engine control unit is empty. At first I thought of a defective ignition coil. I tested them all with the help of an inductive sensor while the engine was in the lower rev range. The result is that all ignition coils have an ignition spark. Then I thought that maybe due to thermal reasons, the output of one or the other ignition coil is too low. So I packed all 4 ignition coils in the freezer for one day with the result that the engine started perfectly. Next I organized an orig. BMW tester and had the misfiring service module processed, which also tested the injectors and also there, no error in the result. Then I suspected a dirty or stiff throttle valve, but even there, everything is clean and the service function for controlling the throttle valve is processed without errors. The intake manifold and inlet ducts are also not coked or excessively sooty.
We bought the car about 1.5 years ago with only a few kilometers, my wife drives 62 kilometers across the country every day. So I would also rule out driving behavior as a reason.
I almost guessed that the torque converter lock-up clutch was defective, but with P or N the error gets even worse.
Does anyone have any ideas before I start to swap things senselessly?
Please excuse my bad English, greetings from Germany
Key data about the vehicle: Mini F57 VFL, Km 36,000, Mod 2016 EZ 2017, engine B48A20M0, I-Stand F056-16-07-502
Ignition coils have part no.8678438
Youtube Video https://youtu.be/9h7Pg85YhYQ
Thank you for your help.
I have a problem with my wife's Mini F57 Cooper S.
If the car has been standing still for more than 2 days, it sometimes gets into an uneven engine idle during the cold running phase as soon as the automatic selector lever is set to R too early. I would describe a normal short-term drop in idle speed as completely normal, owed to the frictional torque of the cold oil in the gearbox or in the converter.
But despite the fact that the selector lever is set to P or N, the engine does not immediately come out of the lower rev range to normal idling speed. On the contrary, the speed drops even further, probably due to the specified motor speed, which is a little lower at P or N.
The funny thing is, it doesn't always happen! If the car is stationary for a day, the oil and water have, according to the tester, 17 degrees and it starts normally.
The fault memory of the engine control unit is empty. At first I thought of a defective ignition coil. I tested them all with the help of an inductive sensor while the engine was in the lower rev range. The result is that all ignition coils have an ignition spark. Then I thought that maybe due to thermal reasons, the output of one or the other ignition coil is too low. So I packed all 4 ignition coils in the freezer for one day with the result that the engine started perfectly. Next I organized an orig. BMW tester and had the misfiring service module processed, which also tested the injectors and also there, no error in the result. Then I suspected a dirty or stiff throttle valve, but even there, everything is clean and the service function for controlling the throttle valve is processed without errors. The intake manifold and inlet ducts are also not coked or excessively sooty.
We bought the car about 1.5 years ago with only a few kilometers, my wife drives 62 kilometers across the country every day. So I would also rule out driving behavior as a reason.
I almost guessed that the torque converter lock-up clutch was defective, but with P or N the error gets even worse.
Does anyone have any ideas before I start to swap things senselessly?
Please excuse my bad English, greetings from Germany
Key data about the vehicle: Mini F57 VFL, Km 36,000, Mod 2016 EZ 2017, engine B48A20M0, I-Stand F056-16-07-502
Ignition coils have part no.8678438
Youtube Video https://youtu.be/9h7Pg85YhYQ
Thank you for your help.
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Habe scheinbar dan selben Fehler
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