Chrysler Repair: high idle 95 cirrus 2.5 v6, vacuum lines, gas mileage

Question
i have a 95 cirrus v-6. it idles about 2000 rpm unless i turn on a/c.then idles around 1000 rpm has no codes..i have replaced iac,map,tps.is there any other sensors that control idle speed.i have chased all vacuum lines and no leaks.the car runs good and is driveable.. travel 600 miles round trip in it all the time. has no misses. gets good gas mileage on highway.. uses a lot of gas in city because of high idle problem.any ideas would be appreciated

Answer
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Thanks again


Hi again David,
It was last November that you wrote me about your high idle speed problem with your 2.5L V-6. Another owner of that engine wrote me today to ask if I knew what you found that fixed it so please let me know so I can pass that information along to him. Thanks so mucn.
Roland






Hi David,
One question: when you said no codes, did you mean that you didn't even get a code 55? If so then the code readout didn't work because at least you should get a 55.
Roland

Hi David,
I would be inclined to remove the throttle body and clean it thoroughly with attention to the iac passageway and the throttle body bore and plate. If there were an obstruction that kept the throttle from closing or the iac tip from moving freely in its passageway, that could cause your problem.
There are also a number of measurements regarding the iac driver ciruits which may be not functioning properly but in most circumstances these would set a code. Did you check for codes using the ignition key, and did you also check using a diagnostic readout box II? If all that checked out, then trying a new PCM may be the last resort.
Please let me know if any of these suggestions are helpful, and also if you find another cause for this.
Roland