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CRX Failing Smog Due to Idle at 1000RPM

Got a problem with your stock CRX? This is where you should start.

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CRX Failing Smog Due to Idle at 1000RPM

Postby vstevenson » Mon Oct 12, 2020 5:45 pm


My 91 CRX Si just failed smog due to a high idle (1000RPM). The smog tech said that it must be around 750RPM. When I look on the tach, it shows as 650RPM, but the smog tech's timing light showed him 1000 RPM and he said the analog tachs are inaccurate at lower RPMs.

I have confirmed the coolant is topped off. What are the other things that could be contributing to the high idle and how can I address them?

Thanks for the help!

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