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SportTrac Discussion
Engine & Drivetrain
What else to look for? Idling,fluttering
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<blockquote data-quote="scott degroot" data-source="post: 938987" data-attributes="member: 66039"><p>Short term fuel trims should always be around 0 and they will usually fluctuate between -3 adn +3. What's more important is the long term fuel trims though as this is the "learned" value. Ideally we would like to have long term fuel trims at 0 but realistically if the readings are within 10 either + or - that is acceptable...not ideal but acceptable. On Fords anything that is over 15 + or - will set either a lean or rich code.</p><p></p><p></p><p></p><p>The baro reading depends on elevation and is solely calculated by the mass airflow sensor. This reading is one of the most important pieces of information along with fuel trims that I look at when diagnosing a rough idle or lean/rich condition.</p></blockquote><p></p>
[QUOTE="scott degroot, post: 938987, member: 66039"] Short term fuel trims should always be around 0 and they will usually fluctuate between -3 adn +3. What's more important is the long term fuel trims though as this is the "learned" value. Ideally we would like to have long term fuel trims at 0 but realistically if the readings are within 10 either + or - that is acceptable...not ideal but acceptable. On Fords anything that is over 15 + or - will set either a lean or rich code. The baro reading depends on elevation and is solely calculated by the mass airflow sensor. This reading is one of the most important pieces of information along with fuel trims that I look at when diagnosing a rough idle or lean/rich condition. [/QUOTE]
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SportTrac Discussion
Engine & Drivetrain
What else to look for? Idling,fluttering
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