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SportTrac Discussion
Engine & Drivetrain
Low idle when ambient temp is cold
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<blockquote data-quote="scott degroot" data-source="post: 997309" data-attributes="member: 66039"><p>I don't think you are going to have much luck in changing the temp sensor. You state that the temp gauge seems to read lower than another vehicle, even though it is a Ford that is not a good comparison, but lets just go with it. The gauge reads lower which you interpret as the gauge not reading hot enough, this would in turn cause the idle speed to increase as the pcm increases idle speed to compensate for a cold engine. Lets assume though that it is the case and the pcm is casuing a rich condition by thinking the engine is colder than it should be, typically a rich condition won't cause a rough idle UNLESS it is grossly rich. A lean condition on the other hand will casue a rough idle. </p><p></p><p></p><p></p><p>I'm not totally convinced that you have a low idle problem. Obviously idle speeds will very with engine load such as the ac being on or turning the wheel with the vehicle stopped or just by putting the vehicle in gear. In theory the pcm should set a a code for lower idle than expected if it though there was an issue.</p><p></p><p></p><p></p><p>Does the idle feeling change between reverse, neutral/park and drive? In reverse and drive try holding the brake and goosing the throttle a little and then let the engine return to idle, does the feeling change at all?</p></blockquote><p></p>
[QUOTE="scott degroot, post: 997309, member: 66039"] I don't think you are going to have much luck in changing the temp sensor. You state that the temp gauge seems to read lower than another vehicle, even though it is a Ford that is not a good comparison, but lets just go with it. The gauge reads lower which you interpret as the gauge not reading hot enough, this would in turn cause the idle speed to increase as the pcm increases idle speed to compensate for a cold engine. Lets assume though that it is the case and the pcm is casuing a rich condition by thinking the engine is colder than it should be, typically a rich condition won't cause a rough idle UNLESS it is grossly rich. A lean condition on the other hand will casue a rough idle. I'm not totally convinced that you have a low idle problem. Obviously idle speeds will very with engine load such as the ac being on or turning the wheel with the vehicle stopped or just by putting the vehicle in gear. In theory the pcm should set a a code for lower idle than expected if it though there was an issue. Does the idle feeling change between reverse, neutral/park and drive? In reverse and drive try holding the brake and goosing the throttle a little and then let the engine return to idle, does the feeling change at all? [/QUOTE]
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SportTrac Discussion
Engine & Drivetrain
Low idle when ambient temp is cold
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