High Idle
03-17-2009, 02:20 PM
#1
Melting Slicks
Thread Starter
High Idle
Email from guess who"" Got this a while ago
It's normal for the LT5 to idle at about 1500 rpm when the speedometer is reading more than 0 MPH. The engine should slow down to idle speed a few seconds after the speedometer reads zero. A vacuum leak can cause the engine to idle down more slowly. Common leaks are at the dual connector fitting at the left front of the plenum on a '90s. On all model years the PCV valve grommet can leak. The throttle could be sticking, as the idle control system tries to compensate for it the idle control may be slower.
Best of luck.
Marc
It's normal for the LT5 to idle at about 1500 rpm when the speedometer is reading more than 0 MPH. The engine should slow down to idle speed a few seconds after the speedometer reads zero. A vacuum leak can cause the engine to idle down more slowly. Common leaks are at the dual connector fitting at the left front of the plenum on a '90s. On all model years the PCV valve grommet can leak. The throttle could be sticking, as the idle control system tries to compensate for it the idle control may be slower.
Best of luck.
Marc
Last edited by illenema; 03-17-2009 at 03:16 PM.
