Vehicle idling high when turned o

Vacuum leak is the most common If any hose is cracked, loose, or disconnected, the engine sucks in extra air idle rises. Check these hoses PCV hose Intake manifold vacuum hoses Brake booster hose Air intake duct between airbox and throttle body If you hear a hissing sound, that’s your leak. faulty coolant temperature sensor If the sensor thinks the engine is cold, it raises idle to “warm up” the engine even when ho High idle when warm Poor fuel economy No check‑engine light sometimes. Air intake leak after the MAF ******sensor If air enters after the MAF sensor, the ECU thinks less air is entering → adds more fuel high idle Check Loose clamps Cracked intake pipe Damaged air filter housing