Alec
Thank you for the heads up on the Jet pulleys. I have a 98 F-150 with the 4.6 with ASP pulleys on. ASP makes good pulleys just not for that 4.0!
I had upqraded the stock ignition on that 4.6 with Densos, Accel wires, and MSD coil packs. Those additions really smoothed out that motor and increased throttle response. So, I was thinking that similar moves on the 4.0 would yield similar results.
A check engine light got me started on thinking of upgrading my 4.0 ignition. I hooked up my Auto Tap software and pulled the misfire on cylinder #3. The plugs were Bosch single electrode platinum and less than 10,000 miles old, but I pulled the #3 plug anyway and found it to be in good order. I have a set of Taylor wires on order to replace stock wires. Hopefully this will clear up that misfire problem. I was just thinking that I might need to look to the coil pack if the Taylor wires din't do the trick.
Aldive
I have a 98 F-150 where I installed two 16" Derale electric cooling fans. They came as part of a kit including two controllers so each fan runs independent of each other. I have the come on temp set at 200 for fan #1 and 210 for fan number two. The benefits are these: about a 1.5 mpg fuel economy increase (getting 18.5 with the truck now) and some wonder throttle response and low end pick up. It stands to reason that if the engine doesn't have to acclerate that 10 pound fan, then it can concentrate on beating that Chevy that might be next to me at the red light!! It was this experience that got me thinking about upgrading my wife's 99 Ex 4.0.
Now the radiator on my 4.0 measures about 20" wide by about 22+" high. According to my calculations I figured I could make a 12" and a 10" fan fit on that radiator with a little wittling on the plastic surrounds. I was all ready to go, but then decided to spend the extra $50 for a second controller (you see one controller would easily handle the 10 and the 12 together, but would only handle one 16" fan) so I would have two truly independent electric fans. I am currently waiting for the second controller to arrive before beginning the installation. Obviously once you remove the stock fan, you have to have a plan and work to completion before you can drive the car again. The one added benefit of the electirc cooling fans using the controllers I have is running a lead from one fan controller over to the air conditioner compressor and wiring into that circuit. The beauty of that is this: whenever you have the AC turned on, then one electric cooling fan is running. So, when you are sitting in mid-summer heat and traffic you are getting plenty of air moving through your AC condensor -- meaning your AC is working good and the folks next to you are cooking since they have no electric fans!!!
I am sorry I got so long-winded, but I wanted to explain my electric fan theory. When I get those fans installed, perhaps I can post a couple of pictures.
I went with the Derale fans because in my opinion they were the best built ones on the market: heaviest motors, heaviest wiring and plastic surrounds. I know I want my cooling fans to be "bullet proof". Obviously I can't get down the road without them once the stock fan is removed.
