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BMW 318Ci e46, automatic transmission. This started happening after the alternator failed and got replaced.

This only occurs when stopping with gear on and rpm drops very low. Absolutely no problems when idling with neutral/parking gear.

First it sound like its about to stall and then rpm starts jumping between 500 and 1000rpm.

Is this related to the alternator failure or did the mechanics screw something up?

EDIT: Voltages are fine according to on-board computer test.

  • Hi Sam and welcome. Doubtful the alternator itself or its proper replacement is the cause. Perhaps some nearby wiring was touched (something like a throttle position sensor cable or similar). Can you check the connectors and such that might have been disturbed? – mike65535 Apr 18 at 12:45

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