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1995 Lexus LS400 Question: Eng rpms go up.

 

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dacooper, 4.0L V8, Knoxville, TN, May 30, 2011, 13:06
 Rookie

When I turn on the A/C the eng rpms go up, and makes the car
idle rough.

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  • Answer #1

    May 30, 2011, 15:05
     Master

    It's normal for the idle speed to rise when the A/C is on but the engine shouldn't run rough. I assume that the check engine light isn't on or you'd have mentioned it. I'm thinking that the A/C compressor may be seizing up and causing the engine to stagger or there may be an ignition or fuel problem.
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    https://repairpal.com/directory?address=37938&car_brand_names=Lexus

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