Join Date: Mar 2008
Location: Kapuskasing Ontario Canada
Mentioned: 7 Post(s)
Service manual mentions using an accurate digital tachometer to read individual throttle body vacuum at 1300 ±50 rpm, while adjusting vacuum bypass screw to read 37.9 ±1.3 kPa (285 ±10 mmHg) because idle speed changes when making adjustments... Right throttle body's vacuum bypass screw is actually left closed, with adjustments made to the left TB screw. We just balance the vacuum between both TB at tachometer indicated 1300 rpm normal idle speed, by adjusting left TB screw with vacuum gauge on both TB vacuum fittings.
Last edited by invader; 02-05-2010 at 01:46 PM.