Nissan Primera idles too high

I drive a 1992 Nissan Primera 2.0 slx wagon, automatic. The engine starts at normal rpm, about 1500 then, with my foot off the accelerator, it begins to rise until, after 3 minutes or so it’s at 2500 and rising. I should also point out that recently the car’s been overheating after a short drive. I’m going to flush the coolant system and replace the fluid. Are these two faults related? Any suggestions.


I suggest you replace the thermostat along with the coolant, and check the function of the cooling fans.

There may be a connection between the engine temperature and the idle speed, but you won’t know until you correct the overheating problem.

Idle speed is controlled by the Idle Air Control (IAC) valve.

It could also be a vacuum leak thru a hose or gasket.


is there an easy way to check for vacuum leaks? Thanks!