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Old 10-18-2009, 12:59 AM   #1
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Default vacuum leak

I have a 2004 5.4l f150 with an engine light coded as vacuum leak. I have a k&n intake installed which may be the source of the problem. What do I look for and how do I fix it on my own?
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Old 10-18-2009, 06:13 PM   #2
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The K&N should not send a trouble code - even if you went with a complete cold air kit, as long as the sensors are re-installed in the new elbow. Better chance that the leak is in the vacuum line on the back of the intake manifold. Happed to my '98 5.4L Expy, my sister-in-law's '03 4.6L Expy, and my wife's '03 4.6L Expy also. Some older sevice techs will use a stethescope with a long tube for zero-ing in on a vacuum leak.
Good luck.
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Old 10-18-2009, 06:17 PM   #3
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Oh yeah, I forgot that the late model mustangs usually can't go with an aftermarket CAI without having to reflash the computer, but I didn't think the '06 F150 had the same issue. In any case, I wouldn't think it would cause a vacuum leak code.
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Old 11-11-2009, 11:33 AM   #4
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Default vacuum leak

i've had to replace all the vacuum line on my 99 f-150, due to crappy hoses ford puts on their vehicles. The main one that gives me issues is the elbow under the air intake manifold....
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Old 11-11-2009, 11:33 AM
 
 
 
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