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jan73
jan73, Auto Service Technician
Category: Car
Satisfied Customers: 532
Experience:  ASE certified, 7 years of european high-line car experience
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Engine has a rough idle when turning AC on.

Resolved Question:

Engine has a rough idle when turning AC on.
Submitted: 6 years ago.
Category: Car
Expert:  jan73 replied 6 years ago.
You will have to clean the IAC (Idle air control) valve and the throttle body.
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Customer: replied 6 years ago.

I replaced the IAC valve with a new one; cleaned throttle body; no improvement at all.

 

Expert:  jan73 replied 6 years ago.
Did you check the engine mounts? Sometimes what happens is when there is a larger load on the engine (and if the mounts are weak), it may cause excessive vibration and may feel rough.
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Customer: replied 6 years ago.
I'll check it out.