Engine - Vacuum Leak at Ignition Amplifier Bolt
Number: J82/24Date: May, 1982
Subject: Manifold Vacuum Leak
Models: XJ6 Series III
A vacuum leak could occur through the threads of the inner bolt securing the ignition amplifier to the inlet manifold. This can cause a rough idle condition.
The bolt should be removed and the bore threads and bolt threads cleaned and dried. Coat the bolt threads with a suitable sealant and replace.