EGR System Check

CAUTION: Do not attempt to adjust the link-rod or converter ball stud between pump output lever and vacuum converter lever. If link-rod setting is changed, it will be necessary to replace complete pump and vacuum converter assembly.

An improperly functioning EGR system results in heavy exhaust smoke and poor engine performance.
If symptoms are not found when engine is cold, warm up engine until fan engages. This is to locate the components which malfunction only when hot.
To check system, disconnect the connector between ECB and engine speed sensor. Start engine and see if symptoms disappear. If they do, EGR system is at fault.
Check the vacuum converter. See Vacuum Converter Vacuum Check. If symptoms are still present, perform the following tests.