1991 BMW 850i AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Speed Control

The idle speed control and maximum speed limitation are achieved by way of the throttle valve position. The EML undertakes the control. DME receives the idle and full load signal from the EML control unit. On the basis of these signals, DME can differentiate between idle, part load and full load operation.

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.