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Why does my Chevrolet Cruze have a rough idle without any indicator on the dashboard?
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4 answers
★ Top Answer
If your Chevy Cruze is idling roughly without the service engine light on, the typical culprits are a vacuum leak, spark plug problems, or issues with the ignition coil. A vacuum leak may not trigger the engine light, as some air can sneak into the intake manifold bypassing the throttle body. Leaks can develop in the throttle body and intake manifold gaskets. Inspect your vacuum hose connectors for cracks that might be causing leaks. You might hear a hissing sound if a vacuum leak is present.
More answers
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The Chevy Cruze is experiencing a rough idle without the check engine light on due to either a vacuum leak or a malfunctioning ignition coil.
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Begin by identifying the OBD II trouble code triggering the check engine light, most likely P0171 indicating a PCV valve leak. To address this issue, consider acquiring an Engine valve cover with an integrated PCV valve, available for $36 on eBay. Another possible culprit could be the EVAP Vapor Canister Purge Valve Solenoid, an easy plug-and-play installation above the valve cover. Additionally, consider checking the condition of your fuel filter. Best of luck in resolving these potential issues.
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