And this may be why (from F150 online for a 2004)....
"Further, each IWE has two vacuum line connections. There is a double rubber vacuum hose at each IWE. You cannot put the hose on wrong- one hose is larger than the other. The larger hose is the vacuum control line from the IWE solenoid, and...
It appears to be the vent line for the front hub 4wd. No idea where it is supposed to connect - there is a fitting and another line somewhere.... Anyone know? The shop manual does not show.
I cannot identify what this wrapped tube is coming up from some wrapped tubes or harness right above the drivers side front shock tower, pointing up towards and almost reaching the bottom of the brake master cylinder. It kinda looks like a vac tube, and that perhaps there is a missing fitting...
I have a 2003 EB with the 5.4 and 4WD. After a stay at the dealership which included replacement of the #1 cylinder plug, coil, and injector, they found that the intermittant firing issue on the cylinder (which has good matching compression with all others) seems to be related to something...
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