LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 1992 >> Q45 Base >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Introduction >> V6 & V8 Idle Speed
April 5, 2026: LEMON Manuals is launched! Read the announcement.

V6 & V8 Idle Speed

  1. Warm engine to normal operating temperature (needle in middle of coolant gauge). Check and adjust ignition timing (if necessary). See IGNITION TIMING.
  2. Check idle speed. If idle speed is not within specification, disconnect Auxiliary Air Control (AAC) valve harness connector. Turn idle speed screw on AAC valve. See IDLE SPEED & CO LEVEL table.
  3. Reconnect AAC valve harness connector. Run engine at 2000 RPM for about 2 minutes under no load and then return to idle. Idle speed should be as specified.
IDLE SPEED & CO LEVEL

Application (1) Idle RPM CO Level
G20
TPS Connected 750-850 (2) Less Than 10.0%
TPS Disconnected 700-800 (2) Less Than 10.0%
M30
AAC Connected 750-850 0.2-8.0%
AAC Disconnected 700 0.2-8.0%
Q45
AAC Connected 600-700 0.2-8.0%
AAC Disconnected 575-625 0.2-8.0%
(1) Under no load and automatic transmission in Neutral.
(2) With Air Induction Valve (AIV) disconnected.