Possible misfire under acceleration and idle, no CEL - BMW M5 Forum and M6 Forums
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post #1 of 10 Old 20th January 2018, 05:42 AM Thread Starter
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Possible misfire under acceleration and idle, no CEL

Drove the M5 first time in a week and 10 minutes into the drive the car began to jerk anytime I started to accelerate. Also noticed a rough idle during a cold start few minutes ago. There is no check engine light and Carly scan came back with no fault codes. Jerkiness doesnít depend on the speed.

Any ideas? Car has 55k miles, so spark plugs are dead? Bad coil pack? Throttle actuators? Car had 1/4 tank of gas...canít imagine gas going bad.

Help is greatly appreciated!

Oh and if it is a coil pack, go with BMW units or do people use something else?


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post #2 of 10 Old 20th January 2018, 07:12 AM
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I had this issue last year. No CEL and it was indeed misfiring. CEL would come on if I red lined it. Coils and plugs were checked but they were not the culprit. It turned out that something had broken off the throttle actuator forcing #9 to not open. Was an easy fix for my mech.
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post #3 of 10 Old 20th January 2018, 08:58 AM Thread Starter
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Quote:
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I had this issue last year. No CEL and it was indeed misfiring. CEL would come on if I red lined it. Coils and plugs were checked but they were not the culprit. It turned out that something had broken off the throttle actuator forcing #9 to not open. Was an easy fix for my mech.


Do you recall if any parts had to be replaced and if any codes were present?

Thanks!


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post #4 of 10 Old 21st January 2018, 01:54 AM Thread Starter
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Possible misfire under acceleration and idle, no CEL



Ladies and gentleman, fault codes have arrived. Perhaps the module that delivers these fault codes is also malfunctioning...

Is it safe to assume that itís my throttle valve actuator going out and needing to be replaced? I saw posts about 2B21 fault code being the bank 1 actuator, so 2B22 would mean itís bank 2? How do I tell which one is bank 1 and bank 2?

Thanks!


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Last edited by hashtagdriven; 21st January 2018 at 02:59 AM.
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post #5 of 10 Old 21st January 2018, 02:06 AM Thread Starter
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Above pictures are of the freeze frames I got out of Carly.


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post #6 of 10 Old 21st January 2018, 05:51 AM
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Do you recall if any parts had to be replaced and if any codes were present?

Thanks!


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There were a couple of codes after I caused the CEL to come on by red lining the car but unfortunately, I cannot remember nor did I keep a record of them My mechanic replaced a part on the throttle bodies if I remember correctly and it was very inexpensive - told me to buy him a drink Sorry I can't be of more help
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post #7 of 10 Old 21st January 2018, 05:44 PM
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Above pictures are of the freeze frames I got out of Carly.


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Isnt the 2b57 the MAF sensors. Before i cleaned mine they were setting off other codes. Worth a shot to clean them and run the car for a few days.

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post #8 of 10 Old 28th January 2018, 03:01 AM Thread Starter
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Just to close the loop: all errors were caused by a faulty Throttle Actuator. I replaced both and took this as an opportunity to replace the spark plugs. M5 is alive again!


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post #9 of 10 Old 28th January 2018, 01:37 PM
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Just to close the loop: all errors were caused by a faulty Throttle Actuator. I replaced both and took this as an opportunity to replace the spark plugs. M5 is alive again!


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Glad to see you sorted the issue out! Happy ///M'ing
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post #10 of 10 Old 28th January 2018, 07:40 PM Thread Starter
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Thank you! Makes me wonder if not driving the car for long time periods causes things to go break more often...moisture/condensation buildup, grease/oil hardening, etc.


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