OK here's the story: My kids' best friend got a 94 4 Runner from his dad to drive to high school. It's a v6EFI model. they had motor troubles and it seized. his dad had the motor replaced by a shop.
that was about 6-8 months ago. He's getting HORRIBLE gas mileage. Somewhere right around 6-8 MPG. It's a pretty stock looking truck, the tires are maybe 30's. No real lift or anything.
it's killing the poor kid. He loves the truck but the gas is eating him alive. I have an 81 Land Cruiser with 2F that got better mileage than that. My buddy's 92 FJ80 with 4" lift and 35"s gets better.
I am not familiar with these truck or the emission control stuff so much. They have leakdown tested it and said it tested good (I am not assuming anything is good at this point though).
What are some things I should be checking? Some of the things I think may cause mileage that bad are:
1) Slipping transmission. Doesn't seem like it is, but the car is very under powered. A v6 should be pretty peppy. it's not. So maybe the transmission is slipping. It doesn't over-rev when he accelerated but it doesn't accelerate well.
2) EGR valve messed up? not feeding exhaust gas back in making it run rich. The car passes emissions but smells "off". smells pretty rich to me.
3) injector(s) bad? - maybe bad injector causing misfire and low power. doesn't sound like it's knocking or missing though. Sounds smooth.
what else to check? wheels were not hot, doesn't appear to be dragging brakes, not sure what else to look at. It has new distributor, plugs and wires although I have not pulled them to look at them for clean or gas. Just trying to make a list of things they can look at.
any advice?
that was about 6-8 months ago. He's getting HORRIBLE gas mileage. Somewhere right around 6-8 MPG. It's a pretty stock looking truck, the tires are maybe 30's. No real lift or anything.
it's killing the poor kid. He loves the truck but the gas is eating him alive. I have an 81 Land Cruiser with 2F that got better mileage than that. My buddy's 92 FJ80 with 4" lift and 35"s gets better.
I am not familiar with these truck or the emission control stuff so much. They have leakdown tested it and said it tested good (I am not assuming anything is good at this point though).
What are some things I should be checking? Some of the things I think may cause mileage that bad are:
1) Slipping transmission. Doesn't seem like it is, but the car is very under powered. A v6 should be pretty peppy. it's not. So maybe the transmission is slipping. It doesn't over-rev when he accelerated but it doesn't accelerate well.
2) EGR valve messed up? not feeding exhaust gas back in making it run rich. The car passes emissions but smells "off". smells pretty rich to me.
3) injector(s) bad? - maybe bad injector causing misfire and low power. doesn't sound like it's knocking or missing though. Sounds smooth.
what else to check? wheels were not hot, doesn't appear to be dragging brakes, not sure what else to look at. It has new distributor, plugs and wires although I have not pulled them to look at them for clean or gas. Just trying to make a list of things they can look at.
any advice?