BMW Questions? Ask a BMW Repair Expert for Answers.
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Have you had the fault codes checked at all using a fully compatible scan tool that can plug in and communicate with all computers in your vehicle to see what codes are set?
Let me know so we can continue,thanks Pete.
Will it always stay running if you feather or operate the gas pedal or is it not staying running now either on its own or when messing with the gas pedal?
Did the battery die out at all needing a jump start or was the battery disconnected or replaced before this issue occurred here?
O.k.,I do not suspect you need a throttle valve relearn since the battery did not die out or disconnected or replaced.In some cases this has to be done with a fully compatible scan tool to correct this issue here but usually this only needs done if the throttle valve is replaced or the battery has died out or was disconnected or replaced.This usually takes less then 15 minutes to have done with a scan tool that can do this that most shops or dealers can do.
With the buzz noise occuring as well as the idle not operating on its own this can indicate a fault with the throttle valve itself.I have seen this fail before causing this issue.The computer may be trying to compensate to keep the engine running adding more fuel causing the smell you have from the exhaust itself.
I would first see if you can get the throttle valve recalibrated with a compatible scan tool and see if this resolves the issue and if this does not work then I suspect the throttle valve itself needs replaced.This would need tested further to be sure this is the cause here and will require a compatible scan tool to check the throttle valve signals and perform function tests to see if it has failed.
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