October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.
1978 Models
- After inspecting vacuum hoses, start and run cold engine at idle. Ensure that secondary EGR valve does not operate when engine speed is increased to 2500 RPM.
- If secondary valve operates, replace thermo valve. When coolant temperature exceeds 131°F (55°C), secondary valve should operate with engine at 2500 RPM. If valve does not operate, replace thermo valve.