1994 Land Rover Discovery AutomaticFACTORY OEM SERVICE PROCEDURE

Ignition Timing

IGNITION TIMING (Degrees BTDC @ RPM)

Application Specification
8.13:1 Compression Engine 1-3 @ 800 Max
9.35:1 Compression Engine
With Catalyst 4-6 @ 800 Max
Without Catalyst 3-5 @ 800 Max
IGNITION TIMING ADVANCE

Application (1) (2)(3) Specification
8.13:1 Compression Engine
@ 800 RPM 2 To 4 Degrees BTDC
@ 1400 RPM 6 Degrees & 18 Minutes To 8 Degrees & 30 Minutes BTDC
@ 2000 RPM 5 Degrees & 30 Minutes To 8 Degrees & 30 Minutes BTDC
9.35:1 Compression Engine
With Catalyst
@ 800 RPM 2 To 4 Degrees BTDC
@ 1400 RPM 6 Degrees & 18 Minutes To 8 Degrees & 30 Minutes BTDC
@ 2200 RPM 5 Degrees & 30 Minutes To 8 Degrees & 30 Minutes BTDC
Without Catalyst
@ 650 RPM 1 To 3 Degrees BTDC
@ 1400 RPM 7 Degrees & 48 Minutes To 10 Degrees BTDC
@ 2200 RPM 7 To 8 Degrees BTDC
(1) See ENGINE IDENTIFICATION CODE  under INTRODUCTION.
(2) Check ignition timing advance with engine decelerating and vacuum advance disconnected.
(3) Manufacturer breaks up the degree specification into minutes for more accurate calculations. 60 minutes is equal to one degree.
Factory Service Tools

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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.