7MGE Throttle Body Idle Speed Screw Adjustment After Cleaning

Fuel Systemintermediate✓ OP Confirmed

Problem

While cleaning a very clogged throttle body on a 1990 7MGE, the factory-set adjustable slotted screw (hidden under a black rubber cap) was disturbed, requiring recalibration to restore proper idle.

Incorrect idle speed after throttle body cleaningFactory-set idle screw displaced from original position

Root Cause

The throttle body idle speed adjustment screw (located under a black rubber cap) was moved from its factory setting during throttle body cleaning, disrupting the balance between the mechanical idle air bypass and the IAC valve.

Confidence

Moderate confidence — Original poster confirmed this resolved the issue

View Original Thread →Posted December 2023 on SupraForums.com