gyates
Active Member
OK, I have posted on here before about idle issues with my '05 ST. Now I can maybe help narrow it down and maybe one of you has had the same issue. The ambient temperature the past several mornings in my area has been in the 20's in the morning. I park in a garage at home, and though it is not heated it is insulated, so always warmer than outside temp. After initial engine warm-up I am having issues with the idle being too low. Basically it is ilding around 500-600(indicated rpm's on tach), and stays there until the ambient temp warms up into the 30's and the a/c compressor begins to cycle regularly. I have replaced/cleaned several items including the IAC, throttle body, MAF, and a new fuel filter. But again, problem only happens when ambient temp is cold enough that the a/c compressor is not cycling (a normal feature for our trucks). I have no CEL showing. When the idle is in the 500-600 range the idle is a little rough, but when it hits the 750 range it really smooths out. Has anyone experienced this issue and figured a way to resolve it? Is there a temp sensor for the engine computer that may not be reading correctly? Overhead console and the temp gauge in dash appear to be accurate. I am not a mechanic by any means, but if a simple solution exists, well, I might be wiling to try it. And if it helps, my commute is a combo of highway and typical city stop & go traffic. Thanks.