Question about 1992 Nissan 240SX Fastback

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It has a very low idle and is rough, when you accerlate it clears up but continues when you go back to idle . Also have installed new plugs,rotor cap and wires

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  • Michael Grey
    Michael Grey May 11, 2010

    Good fuel mileage and power when driving?

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  • 321 Answers

Get a can of carb spray and spray out the throttle body right before the butterfly plate.
im sure you will find carbon build up right at the plate at an idle position.this causes a lower idle and rough running.use a clean cloth rag.the inside of the throttle body should be very nice and clean.if you want to prevent this from happening.use super unleaded only and this will prevent carbon from forming in the intake.as premium burns a lot better than that low grade junk they try to sell off.there shouldnt be anything else but super but you know thats another story there.

hope this helps
thank you
jm

Posted on Jun 18, 2009

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