I've recently purchased a 96' 4Runner 2.7L 4Cyl 4WD, it's a five speed with 150000 miles on the motor. When I first got the truck I put new plugs, wires, K&N drop-in filter, a header and full exhaust system (minus the cat.). I also replaced the stock wheels and tires with rims and tires, P265/65/R17's. The new tires are about 2-3 inches taller and quite a bit wider than the origioinal rubber. I noticed right off the get go that I wasn't getting mileage I knew Runners were supposedly getting. I went through about three tanks with the truck bone stock and I got around 15MPG. Even after all of my mods, including the exhaust system(the exhaust manifold was split in two) I am still getting about 15 MPG. I have gotten mixed advice on what may be penalizing me on mileage. My only guesses would be the MAF sensor, O2 sensor, or timing. I can only assume the chain was changed at the schedualed time(90,000?). I plan to put a chain in some time this summer but I am hurting with fuel costs these days. Oh one more thing, I recently took a trip from Helena, Montana to Moab, Utah with four adults in the vehicle and a full load of camping gear and got an average of 22.3 MPG. Any advice you can give me would be greatly appreciated.
have the same problem?
Tuesday, May 1st, 2007 AT 6:59 PM