Why is the Nissan Bluebird engine idling high?

[DeAbigail]

There are several main reasons for the high idle speed of the Nissan Bluebird engine: 1. The idle switch does not close. 2. The idle control valve is faulty. 3. There is air leakage in the intake pipe. 4. The valve timing is incorrect. 5. The fuel injector is dripping or clogged. 6. The exhaust system is blocked. 7. The EGR valve opens during idle operation. Solutions: 1. Adjust or replace the throttle position sensor. 2. Clean or replace the idle control valve and perform a basic idle setting using a dedicated decoder. 3. Locate the leak, reseal or replace the relevant components. 4. Check the timing marks and readjust the valve timing according to the standard. 5. Clean and inspect the fuel injection volume of each injector to ensure there is no clogging or dripping. 6. Replace the three-way catalytic converter. 7. Remove carbon deposits from the EGR valve or replace the EGR valve.