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My cars RPM drops when I switch on the AC. So I need to keep pressing the acceleration pad when at rest. Its fine when I'm driving the car its alright but when I get stuck in some traffic I got to turn off the AC.

Its so hot in summer, if some one provide an useful solution it would be highly appreciated.

Its a Lancer evo VIII

Jason C
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Vishnu JK
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    What make and model do you have? What size engine, and are there any other problems even if they seem unrelated? – GdD Aug 05 '16 at 08:50
  • Without any information on the car, first thing i would check is your alternator or your battery, assuming its a petrol sounds like the AC is sucking too much power to let the engine continue to run properly. – James T Aug 05 '16 at 09:22
  • Lancer evo VIII @2009 – Vishnu JK Aug 05 '16 at 09:23
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    Does it high idle properly when the engine is cold? thinking it could be an idle control valve not properly raising the idle while the AC is on. – rpmerf Aug 05 '16 at 10:17
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    Does the car ever stall if you come to a sudden stop? Could you get us the fuel trims? – Zaid Aug 05 '16 at 16:09
  • Ya my dad told me about some incident like that – Vishnu JK Aug 05 '16 at 16:38

2 Answers2

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You could have either a clogged or stuck IAC valve. Try opening the idle air screw a bit ( say one or one and a half turns ) and see if that helps.

If not, it could also be something like the bearings on the compressor seizing up.

Community
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Robert S. Barnes
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  • The IAC is electronically controlled here. There's no screw to turn. – Zaid Aug 05 '16 at 17:48
  • @Zaid there may be no screw to turn, but that has nothing to do with the IAC being electronically controlled. Both my current cars have electronically-controlled IAC valves and they still have idle air screws. – Robert S. Barnes Aug 07 '16 at 06:26
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clean throttle body most likely it is full of carbon, and removed the idle control valve clean with fuel system cleaner buy it at any parts store :)

ledu
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