#idle
9 posts in Car Diagnostics blog about "idle" — OBD-II diagnostics, DTC codes, repair. ← All posts
-
P2119: throttle actuator control throttle body range/performance
The throttle plate did not return to where the ECU expects it to rest. Nine times out of ten that is carbon, and the fix has a mandatory second step.
-
P2176: throttle actuator idle position not learned after cleaning
The code that appears after a job that should have gone well. Cleaning the throttle body moved the physical zero and nobody told the ECU.
-
Vibration at idle: mounts, misfire or a dirty throttle body
A car that shakes at a standstill and smooths out when moving has a short list of causes, and one live-data reading tells you which.
-
P0506: idle speed lower than expected and the stall that follows
The ECU is holding the throttle where idle should be correct, and the engine is turning slower than that. Something is taking torque, or something is restricting air.
-
P0507: idle speed higher than expected — hunting the vacuum leak
P0507 means the engine idles faster than the ECU commanded and it has run out of authority to bring it down. Almost every case is unmetered air entering somewhere.
-
Rough when cold, fine when warm: why that happens
A symptom that disappears as the engine warms is a clue, not a triviality. Why a cold start exposes what a warm engine hides.
-
P0505: hunting idle — and why cleaning the throttle body does not always fix it
Idle swings between 500 and 1200 RPM and the car stalls at lights. The universal advice is to clean the throttle body. When that works, and when it merely postpones the real cause.
-
Throttle Body and Idle Control: OBD-II Diagnostics — P0120, P0506, P2135
How to diagnose the electronic throttle body (ETB) and idle control through OBD-II: P0120, P0122, P0506, P0507, P2135 codes — Live Data checks without workshop equipment.
-
Fluctuating Idle RPM: 10 Causes and How to Diagnose via OBD-II
Idle rpm not stable — swings between 700 and 1200: how to identify the cause in 10 minutes — MAF, IAC, EGR, injectors, vacuum leak.