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SportTrac Discussion
Engine & Drivetrain
Overdrive problem
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<blockquote data-quote="scott degroot" data-source="post: 930274" data-attributes="member: 66039"><p>Ford's are the worst ones for not turning a check engine light on for a misfire. There are many variables that determine if the light should be illuminated or not. The pcm keeps track of the number of times any given cylinder has misfired, when that number exceeds a set limit the light turns on. A intermittent misfire might never set a check engine light and that is where mode 6 data comes into play. Mode 6 data is basically the "test results" of the monitors that are run on the vehicle and if you can decipher the data you can learn alot of valuable information before the check engien light ever comes on...such as which cylinder is misfiring. If you are having a secondary igniton misfire issue you should be able to get it to act up by doing a good power brake...this is all things your mechanic "should" know though. Also a fuel pressure and volume test would be good info to have as well</p></blockquote><p></p>
[QUOTE="scott degroot, post: 930274, member: 66039"] Ford's are the worst ones for not turning a check engine light on for a misfire. There are many variables that determine if the light should be illuminated or not. The pcm keeps track of the number of times any given cylinder has misfired, when that number exceeds a set limit the light turns on. A intermittent misfire might never set a check engine light and that is where mode 6 data comes into play. Mode 6 data is basically the "test results" of the monitors that are run on the vehicle and if you can decipher the data you can learn alot of valuable information before the check engien light ever comes on...such as which cylinder is misfiring. If you are having a secondary igniton misfire issue you should be able to get it to act up by doing a good power brake...this is all things your mechanic "should" know though. Also a fuel pressure and volume test would be good info to have as well [/QUOTE]
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SportTrac Discussion
Engine & Drivetrain
Overdrive problem
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