Idle Speed & Mixture
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Vandura Special, 1994 GMC Vandura, 1994 GMC Rally Camper Special, 1994 GMC Rally, and 1994 GMC Forward Control. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Idle mixture on fuel injected models is controlled by Electronic Control Module (ECM) and is not adjustable. Controlled idle speed and IAC count can be checked using scan tester. See CONTROLLED IDLE SPEED & IAC COUNT table.
CONTROLLED IDLE SPEED & IAC COUNT
| Application |
Idle RPM |
IAC Counts |
| 4.3L TBI |
| "G" Series |
| Auto. Trans. |
538 |
5-30 |
| Man. Trans. |
650 |
5-30 |
| "P" Series |
| Auto. Trans. |
650 |
20-35 |
| 5.7L TBI |
| "P" Series |
| Under 8500 GVW |
| Auto. Trans. |
550 |
5-30 |
| Man. Trans. |
660 |
5-30 |
| Over 8500 GVW |
| Auto. Trans. |
550 |
5-30 |
| Man. Trans. |
600 |
5-30 |
| 7.4L TBI |
| "G" & "P" Series |
| Auto. Trans. |
750 |
5-30 |
| Man. Trans. |
800 |
5-30 |