This attached PDF document outlines the idle speed regulator driver circuit evaluation.
A customer of mine was experiencing a high idle speed condition and requested his LH fuel injection module to be tested. This article outlines the testing.
The high idle speed problem was found to be caused by vacuum leaks and an aftermarket ISR Valve that didn't function properly.
Rich
Membership Chairman
Charter Member
1993 928 GTS Cover Girl
1987 928 S4
1979 928 5-speed rescue
1979 928 5-liter track beast
