1993 Honda Prelude VTECFACTORY OEM SERVICE PROCEDURE

Idle Speed & Ignition Timing

Ensure idle speed and ignition timing are set to specification. See IDLE SPEED SPECIFICATIONSΒ  and IGNITION TIMINGΒ  tables. For adjustment procedures, see ADJUSTMENTS article in the ENGINE PERFORMANCE Section.

IDLE SPEED SPECIFICATIONS

Application (1) RPM
Accord & Prelude 500-600
Civic & Civic Del Sol 370-470
(1) With Intake Air Control (IAC) valve disconnected, headlights and cooling fan off and transmission in Neutral or Park.
IGNITION TIMING (Degrees BTDC @ RPM)

Application Specification
Accord & Prelude 13-17 @ 700-800
Civic & Civic Del Sol
1.5L
D15B7
A/T 16 @ 700
M/T 16 @ 650
D15B8 12 @ 650
D15Z1 16 @ 600
1.6L (D16Z6)
A/T 16 @ 700
M/T 16 @ 650
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.

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