High RPM's low mileage

[cb7rush]

so I just swapped in a new f22, and I just tuned everything up and changed the o2 sensor as most of you know. The problem I was having lately was that I am getting horrible gas mileage and I started noticing high RPM's at low speed (what I consider low speeds).

I drive normally around 70-80 mph and my last engine did 3200 rpm at 82 mph.

this new engine does 4k rpm at 72-75 mph.

I have no Idea what the hell it is so any help would be greatly appreciated..

also my last full tank of gas went for 240 miles...I used to get 330 to 400 miles so I as you can see I miss that..thanks for any and all help.

[93F22A6]

Auto trans?

[cb7rush]

yeah auto trans..
sorry about that

[Puertorican CB7]

When my car does 65mph its about 3000 rpm... so that seems about right

[StoobyMcDooby]

that seems right.. 55mph = 2550rpm ... 80mph is around 4kish

[cb7rush]

When my car does 65mph its about 3000 rpm... so that seems about right

damn..
thats not normal for me since im used to seeing low RPM's and great gas mileage..
I used to get up to 90 and barely be geting up to 4k and get way past 115 mph and be at 4500 so its not normal for me at all

[cb7rush]

anyone else?

[xaaronx]

did you keep the same tranny? my 5 speed does 80 at about 3k

[cb7rush]

did you keep the same tranny? my 5 speed does 80 at about 3k

yeah same auto tranny as my first f22a6 had..

[PR CB7]

your trans was proably in limp mode
TC might not be engaged or otherwise


NUMBER 1 rule
check your CEL'S

[cb7rush]

your trans was proably in limp mode
TC might not be engaged or otherwise


NUMBER 1 rule
check your CEL'S

I dont have any CEL and the ones that I had were code 43 and I fixed it alredy, and I reset my ECU

[deevergote]

The engine RPM and the speed of the car are directly related to the actual gearing of the transmission itself.

[cb7rush]

so would the transmission be giving me signs that its about to give out?
I had a thread a couple of days ago that the tranny felt hard some days going from park to drive.

[deevergote]

The only way the transmission is going to be allowing the engine to rev higher than before at a certain speed is if it doesn't upshift. Either you're running in third gear instead of fourth, or you're mistaken about the RPM at a certain speed.

[cb7rush]

I always have it in D4 and try to not run in 3 because RPM;s get really high, the last time I did it they got close to red line..