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#1
12-30-2005, 05:24 PM
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99 Engine surges only with A/C & heater on
My 1999 Taurus engine idle speed increases about 100 rpm for a second then drops back to a normal idle for about 5 seconds. This happens only when the A/C or heater is on, not with the vent. If you don't have your foot firmly on the brake the car will budge ahead. It's fine travelling at speed.
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#2
12-30-2005, 06:26 PM
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Re: 96 Engine surges only with heater on
Check the idle speed control motor. When the A/C is on, the rpm's should increase approximately 100 and stay there while the compressor is on. Also check to see how often the A/C clutch cycles. If it is the same as the engine surge, check for proper refrigerant level in A/C system
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