What does a knock censor, and a idle censor do or don't do. Mine has gone out and really need to know what these do for my car.
- posted
18 years ago
96 nissan maxima
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- posted
18 years ago
In a broad and general nutshell:
The Idle Air Control Valve does what it's name implies, it helps regulate the idle speed of the engine (at startup, when you turn on the A/C, etc.).
The knock sensor detects engine knock/ping and the car computer (ECU) uses this information to control the timing of the engine.
I would recommend having the IACV replaced, reset the ECU, and see if the knock sensor failure is re-detected by the car (you'll have to check the ECU for stored codes again in a week or two).
Cheers, Nirav
96 Max GLE, 121k