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rough idle problem clears up when wiring to ac compreesor is diconnected
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gill_plate
New User
Nov 20, 2006, 1:47 PM
Post #1 of 2
(1996 views)
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rough idle problem clears up when wiring to ac compreesor is diconnected
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i have a 99 ford escort sohc 2.o, im having problems with a rough idle when in gear or when ac is on. i read a post on another forum that said disconnect the wiring to the bottom of the ac compressor, he said this causes a lot of vaccuum draw but never explained what the wires connect to other than saying the pressure switch. believe it or not it worked , car runs like new ac still blows cold. i have been thru all the normal fixes , cleaned iac, checked for vacuum leaks , cleaned maf sensor, checked egr and pcv, none of them changed the problem, it still existed. if someone could explain what these wires connect to, i believe they go to the preesure sensor on top of the drier, my only problem is i dont understand if ive isolated the problem to the ac , why did it idle rough while in gear without the ac on. and does anyone know if these wires connect to more than the pressure switch, like the clutch possibly otr the fan motor. thanks if you can help.
crump
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steve01832
Veteran
Nov 20, 2006, 7:15 PM
Post #2 of 2
(1989 views)
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Re: rough idle problem clears up when wiring to ac compreesor is diconnected
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I don't have a complete wiring diagram for the A/C but my pinout chart shows a Green wire with a Black tracer going from pin 87 of the PCM to a pressure switch. Check the wires in the connector that you unplugged, if one is a green wire with a black tracer then this is the pressure switch you unplugged. You should be OK to run without the switch for now, but in A/C season you need to get the system checked. It may just be a bad pressure switch sending the PCM incorrect information and the computer could be compensating based on the faulty signal.
Steve
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