Coolant Flush
September 2026 · Frostproof
2003 Chevrolet Impala
Why Are My RPMs High at Idle?
What the customer reported
The vehicle owner noticed that the RPMs would go high when the vehicle was idling or driving.
What we found and did
The technician conducted a smoke machine emissions test and found issues with the PCV valve and intake manifold gaskets. The team replaced the faulty PCV valve and hose, as well as the intake manifold gaskets, including the valve cover gaskets. They also performed a complete coolant system flush to address acidic coolant that could damage the water pump, radiator, and thermostat.
Result
After the repairs, the vehicle operated smoothly with normal RPM levels during idle and driving.
Pro tip
High RPMs at idle often point to issues with the PCV valve or intake gaskets. Addressing these promptly can prevent more severe engine problems and maintain optimal performance.