Rick's Free Auto Repair Advice

Posts Tagged: Altima

High idle, rough idle

What causes a high idle, rough idle Diagnose and fix high idle or rough idle Any time you see a high idle, rough idle high, or hunting idle, it’s time to suspect a vacuum leak. Extra air leans out the exhaust mixture, which is detected by the oxygen sensor and reported to the powertrain control module (PCM). To correct the lean condition, the PCM adds fuel. The extra fuel and extra air are the equivalent of pushing down on the accelerator. As the engine speeds up, the PCM notices that … Read More

Alternator noise – Nissan

Nissan Alternator makes noise Some owners of 2002-05 Nissan Altimas and Sentras report an alternator noise or  whistling coming from the alternator after the engine is shut down. This is considered a NORMAL condition and is caused by the rotor “slow-down” function that is built into the alternator. Before you lose a gasket over this problem, note that other vehicles equipped with alternator decoupler pulleys also experience some noise after engine shutdown. Do NOT replace the alternator if you hear this type of noise.   © 2012 Rick Muscoplat

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