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My truck runs rich when the alternator is plugged in. When plugged in I get 14.5v at the battery and the truck runs rich. 10% CO and HC ppm to be exact. It runs good but not as crisp as it should. When I unplug the alternator field fuse and/or unplug the alternator connections it runs much...

When I first start the truck and put it in reverse it doesn't go right in. It will eventually after about twenty seconds. It goes right into drive. If I drive it twenty feet down the road, stop, then it goes right into reverse. It was a little low on fluid so I did it one better and changed...

My explorer won't go into four wheel drive or four low for that matter. It is an electronic button type. when I push the button the light doesn't light up and nothing seems to happen. I checked all of the fuses with no luck. I know nothing about four wheel drive so any help is greatly...

I finally got my truck to run smooth but its still running rich. The plugs are powder black color, it struggles at idle and the exhaust leaves a black spot on the ground. If I prevoke a small vacuum leak it runs much better and the exhaust is clean. My ECU coolant temp sensor seems to check...

What is the plug gap for a 1991 Ford Explorer 4.0? Also, does anyone have a link for a 91 Explorer/Ranger manual download? Thanks!

I just bought a 91 Explorer 4.0 "as is" advertised as being a good runner but slowly lost power and eventually would stall with the application of throttle. I figured if the fuel pump cycles its a plugged filter. The pump cycled but sqealed a little. I then thought install the filter and see...