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Old 06-15-2005, 06:32 PM   #1
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Question idle stuttering w/o A/C on...

2000 Focus LX, ATX. Recently I've been having problems with idling. Usually I drive with A/C on and when I come up to a stop light the car is automatically idling higher because of the A/C being on. When I turn the A/C off and come to a stop the idle seems to stutter and shake a little. This has only started to happen and I want to correct the problem before it starts to stall out on me. Where should I be looking for a fix? Is the cat clogging, maf, 02 sensor???
Where would be the most likely place to look?


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Old 06-16-2005, 09:51 AM   #2
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Do you got any mods on your car, performance wise?
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Old 06-16-2005, 06:38 PM   #3
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Nope, all is stock. What do I look for that would be the most likely cause? Anyone?
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Old 06-17-2005, 07:06 PM   #4
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The idle should be the same AC on or off. The computer is supposed to compensate for that so the idle speed remains constant. I'm pretty sure this is all electronic. I'd suggest ypu start by checking all your wiring connections relating to the compressor, the pressure switch under the fender ahead of the RF wheel, and any others relating to the AC. (And any others, period.)
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Old 06-18-2005, 11:00 AM   #5
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No. My car up the idle circuit slightly to compensate for the load of the AC.. It sounds like yours is not.
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Old 06-18-2005, 07:50 PM   #6
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No, actually mine is 'upping' the idle with the A/C on. The problem seems to be with the 'normal' idle with A/C selected off. It seems to be lower than normal. With the A/C on and the idle slightly higher to compensate it runs normal but with the A/C off is when it is running rough or sputtering. I'd like to adjust the regular idle up a little like in older cars but I guess you can't do that with the new cars. What can I do to get the regular idle to run higher or normal again?
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Old 06-18-2005, 10:41 PM   #7
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If memory serves me right.. There is still a small idle screw on the TB, just like in the old days..adjust it a little
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Old 06-18-2005, 11:05 PM   #8
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Quote:
Originally posted by viney266
If memory serves me right.. There is still a small idle screw on the TB, just like in the old days..adjust it a little
Nope our idle is controlled by the computer and not that little screw. Trust me it will do nothing to adjust it but cause you problems. The purpose of the screw is to keep the butterfly from completly closing all the way when your foot is off the gas.
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Old 06-19-2005, 09:01 PM   #9
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Come on guys, help me here....Viney, you are a moderator? Please be more correct with these kind of instructions. I don't want to go tweeking screws on the TB if lildisco is correct in saying it will screw things up. And lildisco, doesn't a screw that will adjust the butterfly valve a little exactly what I would want to adjust anyway? This would adjust idle wouldn't it?
Can anyone give me some good info on this please?
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Old 06-19-2005, 11:17 PM   #10
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The little screw on the TB only opens the butterfly a hair more to allow air in a bit better. It does not add more fuel. I have a FC 65mm TB on mine, and many of them came adjusted a hair to tight and needed to be opened a bit more to make for smooth throttle tip in.. With the stock TB this is not neccessarily the case ( my brain was thinking about the 65mm, as we get asked about these all the time). However, there is nothing you are going to damage or "screw up" by moving this screw.. Logic dictates that you can always move it back...Geez!

BTW...as moderators we do not have degrees in focusoligy, just so you know ...LOL
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