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Just wanted to add to this.. Anytime I pressed Rear Defrost or tried my power mirrors, I had the DOOR AJAR buzz and indicator.. Recently my headlights started doing the same thing when I turned them on.. Time to investigate.. No amount of slamming my driver's door or lubricant on the...

I replaced my timing chains because they were rattling.. They were extremely loose once I got in there, and were actually rubbing the oil pump. A pump failure was immanent if I had not changed them when I did.

Have you changed your fuel filter lately blackout? Might return you to those 20 something memories of 21mpg. Go with a quality filter is what I learned.

Drove a 300 mile highway trip today, pulled my utility trailer the whole way, still managed 14 mpg. I think it would have been above 16 without the trailer. Good luck in the spring when you change yours.

Well, I decided to return the temp sensor, as I didn't think that was the problem. Went ahead and grabbed a new $20 fuel filter. Removed my old filter, noted 'Made in China', I guess I cheaped out on it last year. I also was reminded why I didn't enjoy changing it.. Hard to get to, TWO...

Sounds feasible, thanks. Will do ECT then filter in a few days and update.

Hmm.. I might do that. I went ahead and picked up a ECT sensor, 155k on the engine, so it is probably had it's use, going to see if that makes any difference first, if not, I'll try that again, thanks.

Guess I should have spend $370 for a cold air intake? That's probably you're rational. Buddy, I've built over 150 EFI Fords from the ground up, and your trivial opinion means nothing to me. I bet you're the .1%.. All the emperical evidence points to replacing the filter led to worst fuel...

Go for it smart guys. Only item changed before my immediate fuel economy drop. If it's not broke don't fix it. Except for you two geniuses of course.

Well, after my purely high trip, it's getting 14mpg highway, and about 11 city.. So that about a 3-4 mpg drop on average.. About $1000 a year.. My advice for anyone who plans on changing your fuel filter as routine maintenance, DON'T.. Don't touch it unless you have a lean condition on your...

Yeah.. I've reset similar to the posts on here's instructions.. I just did it again to be safe, I'll monitor my trip tomorrow.

I've reset the battery multiple times, if that clears KAM then it should have been cleared long ago. As a matter of fact, replacing the battery is the reason my 4x4cm was killed and needed replacing, a brilliant design on the 2002s by Ford. Just for perspective, the fuel filter mpg change was...

It's always ran great, even before the fuel filter change and mileage drop. I have had to replace timing chains, a COP, and the 4x4CM module, but don't think those are related to the EFI issue.

I do the math.. But currently I've went 120 miles on this tank, and it's over half gone..

The airbox mod makes perfect sense, the inlet on the bottom of the box is like breathing through a straw. You put the holes in the front side of the box where the same holes are the normal inlet runs through. You wouldn't want to put holes on the fan / engine side. Whether or not it helps with...

Thin is I'm going by actual mpg I was getting, not kbb rating.

It's been doing it since this past spring when I changed the filter. Good thought, but I'm in KY not CA, there's no winter blend here so to speak.

It wouldn't bother me if I wasn't getting 15/17 at least, and now have dropped 4 mpg. And it happened immediately after the fuel filter change, so I don't know how it could be a coincidence. Once other thing I wondered, I used platinum plugs, is that was was original in these 4.6s, or were...

Yes, It's installed with the arrow pointing toward the flow / engine direction. Today I used some MAF cleaner and did the air box mod putting some 1" holes in the box to get more air into it. Still no change.

I have an 02 v8 Eddie Bauer. When I bought the truck (used of course) I was seeing about 15 mpg around town and 18 mpg on the highway, combined roughly 16-17 mpg. Truck had ~ 140k on it. I was tickled with that. I'm pretty thorough about maintenance, so I wanted to make sure the truck was...

Want to post up my experience and hope it helps or saves some money. I have a 2002 Eddie Bauer 4.6 Explorer. I had to have a new battery installed as mine was shot. Lo and behold, when I got the truck back, the 4x4 did NOT work. I found this thread and a few others, and rolled the dice...

It's an 02 BTW, mistype. I know someone knows this vacuum routing, come on guys.

No one? I can't find a vacuum diagram anywhere. This hose comes out of the bunch that feeds the EGR, it 'Y's off right by the EGR.

Holding the pedal to the floor sends a signal from the ECU to turn off the injectors. If you don't want try adding fuel directly through the throttle body as I suggested, only other diagnostic I could suggest is to pull a spark plug, lay it near metal on the intake, can crank it and see if it's...

You need to isolate if it's a fuel OR a spark issue. I'd remove the intake tube and spray some carburetor cleaner into the throttle body, then try to start it. If it starts and dies it's a fuel delivery issue (fuel filter changed lately?). If it won't start with the ether sprayed to it, it's...