 Loss Of Fuel Mileage! I Need Help!
I need help real bad! I have a 99 Ranger, 4.0 V6. I have a Gibson exaust system, K&N cold air intake, 4:56 rear gears, a computer Jet Chip and it's lifted with 33'' mudders. Before I did all of this work to this truck, it was bone stock, getting about 225 miles to a full 18 gallon tank. After doing all of this work 2 years ago, I was getting 220 miles to a full 18 gallon tank. For the past 6 months, I've seen the fuel mileage go down drastically from 220, to 200, to 180, to 140 miles to a full tank without changing anything mechanically.
By using a combination of my own judgement and other peoples comments and suggestions; I've replaced the following parts in hopes to increase my fuel mileage:
-FUEL PUMP
-FUEL PUMP RELAY
-2 O2 SENSORS (CLOSEST TO THE EXHAUST MANIFOLDS)
-MASS AIR FLOW SENSOR
-SPARK PLUGS
-SPARK PLUG WIRES
-FUEL INJECTORS
After replacing all of the fuel injectors and all of the spark plugs because a couple of them were flooded from the bad fuel injection, my fuel mileage jumped up to 200 miles to a full 18 gallon tank. To me, it just doesn't seem enough!
Can anybody help me to figure out what else it could be? It's also pulsating a little when sitting in nuetral or at a light.
Do I need to disconnect the battery to reset the computer after replacing fuel injectors? Could it need engine work?
Thank you in advance. I am completely out of ideas on my own!
-Todd
(858)568-5032 | 
