1998 Volvo S70 Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Idle Speed & Mixture

IDLE SPEED & CO LEVEL (1)

Application Idle RPM (2) CO Level
C70, S70 & V70 (3) 850 (3) .2-1.0%
S90 & V90 750 .2-1.0%
(1) Idle speed can only be checked, not adjusted. On C70, S70 & V70, CO level can only be checked. For S80 & V90 CO adjustment, see ADJUSTMENTS article.
(2) Measured upstream of catalytic converter with oxygen sensor connected.
(3) With cooling fan on.
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:

  • 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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