Lexus RX300 Rough Idle

Learn if it's a simple fix or time to seek out a trusted technician.

What are common reasons my Lexus RX300 has a rough idle?

While there are a variety of reasons your Lexus RX300 has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
of the time it's
Vacuum Leak
of the time it's
Spark Plugs
of the time it's
Ignition Coil

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Related Lexus RX300 Questions

See what others are asking about their Lexus RX300. Get answers from RepairPal's community of auto experts and enthusiasts.
My 2001 lexus rx300 idels rough & has 169k mi and just today we changed the plugs and coils on it. when we start...
Problem started a few months ago and has gotten very consistent now. after driving for as little as 30 minutes, upon...

Related Lexus RX300 Problems

Find the most common driver-reported problems that are to blame when a Lexus RX300 has a rough idle.
The lexus rx300 has a known issue with the valves that if left unchecked, will cause burned valves and engine perform...
Debris can get into the idle air control valve. this will restrict the air flow into the engine, causing idle speed ...
Lexus RX300 Repairs and Prices
All costs based on RepairPal Fair Price Estimate™ averages. Actual prices may change depending on final diagnosis.

Lexus RX300 Rough Idle Repair Symptoms

A failing ignition coil can create several symptoms: Check engine light comes on Engine runs poorly or stall Increased emissions Reduced fuel economy Car won’t start I...Read More
When spark plugs fail, the engine will struggle. The check engine light will come on, and it may appear either solid or flashing. The driver would likely notice one or more of t...Read More