Question about 2002 Dodge Neon

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2002 Neon - car idle rough with the A/C on. Have changed spark plugs, air filter, etc. and still runs rough. Took it to a shop and there are no fault codes. The problem only happens when the car sits in the sun for a few hours (hot) and will only happen when you come to a stop. The idle normally runs at 750rpm (No a/c on) and will drop down below 500 intermittently with the A/C on). Should the idle increase when the A/C is turned on with more load on the engine? If so; the idle remains at 750rpm. Any ideas?

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  • Dodge Master
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YOUR ENGINE IS IDLING LOW.MOST CARS WHEN YOU TURN ON AC THE PCM WILL INCREASE IDLE SPEED TO KEEP ENGINE FROM STALLING OUT.I WOULD HAVE THE IDLE SPEED CONTROL CHECK OUT AT THE DEALERSHIP.THEY WOULD HAVE TO ADJUST YOUR IDLE SPEED.SINCE MOST IS PCM CONTROLLED.

Posted on Sep 26, 2009

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Posted on Jan 02, 2017

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