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You probably had a backfire during the start which blew the sensor out. Hopefully that's all the damage it did, minimally it could have popped other vac line(s) off, or blew the intake manifold gasket. I am certain that having that sensor out can have caused poor running and a check engine...

^ That could be why it ran better for a day, till the computer relearned and leaned the fuel mix. Some people automatically disconnect the battery any time they work on a vehicle. I don't, well I do it more often on vehicles with electric fans.

What is every check one can do? I mean you may have done this already but did you pull the blower motor (squirrel cage) wheel out and check it for gunk buildup, and attempt to clean the air passage into it in case there's leaves/insect nests/etc partially blocking it? You might also want to...

^ Amazon reviews for that don't look very promising with near half the reviewers giving it the lowest 1 star rating possible on Amazon. How do the glass repair shops reattach it? I wonder if it would take and last if the wire were pre-tinned then the window cleaned and coated in plumber's...

I suspect that you meant that the other way around, that using same color LEDs as the lens gives optimal brightness as mentioned here: '97 third brake light conversion to LED However a little bit brighter white LEDs can offset that fine. Utmost efficiency isn't important for this application...

^ I don't want to write a novel in dispute, but I completely disagree. PWM is a nice idea on paper or for throwaway products but not something meant to last outdoors for the 20 years we're now facing. It is cheaper to design a linear circuit within longer lasting thermal limits than PWM when...

It wouldn't be hard to rig something up... take any circuit lead live with ignition on to activate a relay, take 12V from battery through a fuse, relay and then split to ~ 4 series diodes per bulb to drop ~ 3V to low or high beam, checking brightness with 3 in series, then 4, then 5. Given...

Yes probably a little. With the trailer you might have another couple hundred lbs trailer weight (or more), drag from trailer tires and worse aerodynamics. I'd still use the trailer if you have too much rear end sag loaded, guessing the loss is only a MPG or two.

I'm just guessing, but my guess would be plastic studs molded into the plastic then those sheet metal nut things that self tap [self die? :) ] onto the plastic studs.

I do recall that once (for a different vehicle) I bought a replacement water pump, put it on and the engine bogged down to a nearly stalling state which it had never done before, yet it seemed to turn okay by hand both before and after I'd put it on the engine, and after I'd pulled it back off...

Something I never thought about is does the A/C compressor clutch engage during starting if A/C is turned on (at the dash)? I'm asking anyone, not a diagnostic question for Royalflash. I'm probably barking up the wrong tree but if it does, that could explain it turning freely by hand but then...

Yeah I also would want a different mechanic, or DIY, be ready the next time it's running rough and while it is, hook up an OBDII scan tool capable of showing live data, check the fuel rail pressure, and check for spark on all cylinders. You might also pull the spark plugs and examine them and...

Yeah I'm only getting color and body style now too, while it worked before they changed it. Here's one that gives more info, though some of it might be generic info, not just tied to the VIN #: VIN Decoder - Ford Truck Enthusiasts Forums

Keep an eye on your oil level.

While I also doubt it's the tire, there might be a tire shop near you that will shave the tire down to a matching diameter for ~ $20. Vibration slowing down seems like it could be a warped (ambiguous term, as likely means raised hard spots on) rotor to me. If there's only one raised area it'll...

^ Yeah my '98 3rd brake light is the only thing I would have been tempted to change to LED... except that Ford already did it for my model year. I did think about adding a cargo bay light but not as small a change as swapping an LED retrofit bulb into the existing housing, which is often no...

You might also take your blower motor resistor or transistor module (same part location, which it is depends on whether manual or auto climate control) off the firewall to make sure there's no built up leaves/debris on it because they are prone to heat failure and need the airflow in that duct...

But is that the vehicle tow rating or just the lower, bumper-mounted-ball tow rating? Not that I'd want to put 3500lbs on a bumper, but it seems like my bumper is rated 3500lb and 350lb tongue weight.

Yeah I just feel like if it's a "package" it ought to come ready to tow without addt'l parts and tools, except maybe swapping the ball size. I don't think my '98 w/tow package has any addt'l electronics/wiring for trailer brakes. Well yes and no. It came with a wiring harness to the left...

While I too would guess leaves in the blower duct, something doesn't add up. How can it accumulate while the vehicle is off and clean when you last left it? Is it possible someone has access to it and is playing a joke on you by stuffing the vents with crushed leaves?

For some reason I was under the impression that the 3.73 diff only came in limited slip for these? I know mine which came with the tow package has 3.73 LS... some tow package though, to not come with a class 3 hitch.

The bottom plastic piece doesn't come off AFAIK, just the cap holding the filter pads on. I soaked the little filter pads in the same cleaner I used for the rest of the IAC.

Yeah first guess would be valve cover gasket, 2nd would be heater hose coolant leak.

...and supply the speed sensor inputs if you want the auto-4WD to function instead of being manual only. What I read was that there is no extra circuit path from the 4WD switch, that it's just sending a different resistance based on the switch position. Is that how the Explorer switch is set...

^ Asegu already has another topic where it was mentioned that '01 sports built after 7/24/00 have the newer PATS with the starter interrupt feature. Granted it could be a pre-7/24/00 sport with a 3rd party starter disabler, but then it shouldn't cause the PATS light to flash trying to start it.

Don't forget to take that black plastic cap off and rinse out the felt pads and the port going into it. Mine had two felt pads, I don't know if that's normal or not. Supposedly some don't even have that little capped port but I figure that if it's there, it must serve some purpose.

^ Good schematics, I am fairly good at reading and reverse engineering. Bad schematics, maybe or maybe not. I know nothing about the Expedition setup except what you've just written, and very little about GEMs in general except the expectation that there's a microcontroller and some...

You now have 3 different topics for the same problem. It seems excessive and more difficult to follow what has already been suggested and what of that you have already tried.

If it's below the o-ring and the center nozzle seems to be held on firmly then I'd suspect it will work, aside from wondering why you have an old one that was possibly rotated out of service for some reason? I suppose my thinking is that you can either buy a new one or put it back together then...

WD-40 is not a lubricant. If you have nothing else, get a drop of oil off your engine dipstick.

When you look into the bottom hole of the IAC, on the solenoid end, the shaft inside that connects to the solenoid goes through a bushing. Put a drop of oil there, where the arrow points on the following pic, then take a pointed object and move the shaft up and down to work the oil into the...

When my IAC got dirty it would cause the engine RPM to drop when the A/C compressor kicked on. It did not set any OBDII codes at that point. I not only cleaned it but also propped it up on end and let a drop of light oil run down into the shaft bushing, moving the shaft up and down a few times...

It looks like you already have a solution that will work, but keep in mind that if you have a GEM at all, there's probably a way to do it without a separate timer module, assuming your relay box has contacts for the defroster relay and you install one. That is, I am assuming the same GEM is...

Looks like a non-specific PATS code, maybe look at the transceiver module around the key cylinder in the steering column. I've read where someone stated it went away if they disconnected the battery, but I don't like that kind of "fix", in that it doesn't tell you why or if the problem will...

Doesn't the instruction sheet in your picture state approximately 10 minutes?

I think it is fair to state that he isn't a very good guesser. It's not water flowing past the thermostat. Whether he is correct that it isn't a pulley... I would not rule it out yet. It might help if you made a video and moved the camera around so you can get an idea of sound intensity at...

You don't necessarily need to add resistors to all the bulbs. It's often more intrusive to the wiring, costs more for custom made modules, and wastes power. Besides that (usually) defeats the bulb-out sensing the same as doing it another way described below. First see the following topic, if...

Factory LED lighting designs are fairly reliable but aftermarket chinese junk is often less reliable than the incan bulb it replaced, due to trying to produce more light with fewer LEDs to keep cost low, and the limited amount of space to heatsink in some bulb form factors. Regardless, one...

I hope they're not cold white LED because that will blind your distant vision more than no fog lights on at all... some of the things pimped on amazon, ought to be a crime.

So you probably talked to the service manager whose job it is to sell as much as possible!