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Old 08-18-2013, 11:13 PM   #1 (permalink)
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Default Idle drops when AC is on

I have a 98 vitara jlx 16v engine AT and my idle drops only when aircon is on. IACV is brandnew, TB has been cleaned, plugs replaced... What else should I check?
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Old 08-19-2013, 05:44 AM   #2 (permalink)
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You need to give a lot more information as to how the car is actually running - what is cold idle at first start up, how/when the idle drops, what your warm idle is, whether your car reaches proper running temperature, etc. By IACV, I assume this is what we call the idle speed solenoid (ISC) on this forum, one of whose jobs it is, is to regulate the idle when you have put a load on the engine. As this is new - perhaps we can assume that it is in good condition, hopefully. Which of course doesn't mean that the connections or wiring to it are ok, or that the air hose isn't blocked up, etc.
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Old 08-19-2013, 03:24 PM   #3 (permalink)
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On the 16V its called an Idle Air Control Valve.
There is a wire from the A/C unit to the ECU that tells it to increase the idle speed when the A/C is on, you should check that the signal is reaching the ECU. What market was your vehicle built for? does the ECU have two connectors or three? Was the IAC duty cycle adjusted when the new valve was fitted?
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Old 08-20-2013, 06:25 PM   #4 (permalink)
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Hi BEX....for 16V its IACV ( Idle Air Control Valve)

at cold idle,it starts at 1500 to 1800
at hot idle it starts 1000 to 1100

If the AC is off, idle is ok but when AC is on, idle drops to 200 and sometimes engine stalls after I rev.

When I install the new IACV, I only adjusted the idle screw located at the top of the manifold, is there anything else that should be adjusted?

Next thing Im planning to check is my AC....
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Old 08-21-2013, 10:29 AM   #5 (permalink)
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While my info will probably not be applicable for the 16v - you should check Rhino's wiring suggestion above. In the 8v, a yellow/black wire runs from the A/C amplifier to the ECU signalling that the A/C is on.
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Old 08-22-2013, 06:55 AM   #6 (permalink)
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When you replace the IACV you need to set the idle such that it is idling at the correct speed with a duty cycle of around 50%. If this isn't done then the IACV may not be able to flow enough air to raise the idle under load.
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