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Member
- Joined
- Aug 2, 2013
- Messages
- 65
- Reaction score
- 2
- Points
- 8
- Vehicle Year
- 1997
- Make / Model
- ford
- Transmission
- Manual
Ok so basically last weekend I did a bunch of stuff to my truck and went from getting 21mpg to 17.5.
I replaced the wires with motocraft wires and the plugs with autolite iridium XP's. The old plugs should have been replaced a long time ago. The gap for most of them was between .090" and .010". I measured the gap of all of my new plugs and they were all right at .044".
I pulled the throttle body out so I could replace the valve cover gasket. When It was out I unbolted the IAC and sprayed it out with some carb cleaner. I planned on cleaning it but ran out of time so I just sprayed it out. Also sprayed out the TB. WHen I first started it up it had a rough idle which I attribute to the iac but after driving it a bit it went away.
I also replaced the timing belt, tensioner, camshaft seal, thermostat, and water pump, though I don't see how any of that could effect my fuel mileage.
My thoughts are it is either the plugs/wires, the iac, an air leak, or busted vacuum line. THe plugs and wires are all plugged up. I did notice when installing the plugs is the boot on the wire would not snap onto the end of the plug you just push it down, and it doesn't take much effort to remove. I didn't really gain or lose any power. I also replaced the air filter. I inspected the engine bay and did not see any loose vacuum lines or disconnected electrical connections.
Thoughts?
I replaced the wires with motocraft wires and the plugs with autolite iridium XP's. The old plugs should have been replaced a long time ago. The gap for most of them was between .090" and .010". I measured the gap of all of my new plugs and they were all right at .044".
I pulled the throttle body out so I could replace the valve cover gasket. When It was out I unbolted the IAC and sprayed it out with some carb cleaner. I planned on cleaning it but ran out of time so I just sprayed it out. Also sprayed out the TB. WHen I first started it up it had a rough idle which I attribute to the iac but after driving it a bit it went away.
I also replaced the timing belt, tensioner, camshaft seal, thermostat, and water pump, though I don't see how any of that could effect my fuel mileage.
My thoughts are it is either the plugs/wires, the iac, an air leak, or busted vacuum line. THe plugs and wires are all plugged up. I did notice when installing the plugs is the boot on the wire would not snap onto the end of the plug you just push it down, and it doesn't take much effort to remove. I didn't really gain or lose any power. I also replaced the air filter. I inspected the engine bay and did not see any loose vacuum lines or disconnected electrical connections.
Thoughts?
