1993 BMW 740iFACTORY OEM SERVICE PROCEDURE

Non-DIS Ignition System

  1. Always disconnect battery or ground cable (located on right rear seat frame) when working on electrical systems, charging battery or welding.
  2. Load secondary (high voltage) side of ignition system with at least 4000 ohms. DO NOT  connect a shielded capacitor or test light to coil terminal No. 1. DO NOT  connect lead of ignition coil terminal No. 1 to ground or battery voltage.
  3. When checking compression, remove Digital Motor Electronics (DME) master relay. DO NOT  disconnect lead of ignition coil terminal No. 1 to prevent engine from starting. DO NOT  disconnect battery or leads on alternator or starter while engine is running.
NOTE: For location of DME master and fuel pump relays, refer to the DME & FUEL PUMP RELAY LOCATION  table under PRELIMINARY INSPECTION & ADJUSTMENTS.
Factory Service Tools

Use the Manual With the Right Hardware

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

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

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

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

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.