Need help with engine speed not matching RPM's after installing a new clutch -

[96rangerdanger]

So, I have a 96' ranger 2wd 5spd. I replaced the clutch and slave with a factory setup, and did the valve cover gasket. My truck was down for about a month or so. My fuel pump was whinning when I first started it. And now when I'm driving on the freeway, it cuts in and out. Probley the fuel pump. Then on top of that, my truck should be at 80MPH in 5th gear and 3000RPM's. Now since I changed the clutch and valve cover gasket, at 3000RPM's I'm doing 75 MPH. WTF? My clutch does not slip at all. Not even off the line. NO ONE has been able to figure this out. I asked people at a transmission shop and they had no idea. Can anyone explain this?

 

[96rangerdanger]

Anybody?

 

[99RangerKrazy]

I guess if your fuel pump is cutting out, I'd start with that. The clutch shouldn't have anything to do with it. Nor would I think a new valve cover gasket..

 

[gw33gp]

It could be a coincidence that the speedometer just decided to be off after the clutch change or something that you did during the clutch change caused the speedometer to be off. Maybe the speedometer is correct now. Have you checked it by comparing with GPS or any other means?

 

[doorgunner]

wild guess.......tire pressure will change the diameter of the tires....1" difference will change the speedo. reading 3 or 4 miles an hour....other than that...I got nothing

 

[heptofite]

wild guess.......tire pressure will change the diameter of the tires....1" difference will change the speedo. reading 3 or 4 miles an hour....other than that...I got nothing

that won't make the speedometer and the tach disagree though, your ACTUAL speed would change, but your indicated speed wouldn't.

 

[Viva*the*Ranger]

that won't make the speedometer and the tach disagree though, your ACTUAL speed would change, but your indicated speed wouldn't.

Actual speed, is actual speed. Nothing is going to change that, it's impossible. Changing the diameter of your tires, will change your speedometer reading. Plain and simple.

 

[gw33gp]

The speedometer does not read actual speed. It reads what ever it is programmed to or geared to (which can be actual speed if it is calibrated properly). It just accepts input and converts to an output reading. If you change tire diameter without appropriate adjustments to the speedometer input or internally it will read the same mph at at a specific rpm it had before the tire diameter change but the actual speed will be different.

Hoever, I think we are all saying the same thing.

 

[Robert_1967]

Check that you got the wires on the back of the transmission plugged all the way in, and that you got the speed'o cable seated properly.




Robert

 

[adsm08]

Bad fuel pump could cause that.

Bad pump = less fuel to injectors

Less fuel = engine works harder to do less

more work = higher RPM.

 

[96rangerdanger]

Checked the tire pressure, 33 psi all around, conections look and feel good, and the fuel pump works great, it just cuts out every once in a while. It will just slow down until it starts flowing again. I was thinking maybe the flywheel is heavier than the previous, but I'm not sure if that would even matter except with take-off's from a dead stop.

 

[Robert_1967]

Check the relay, it might be going bad, might just want to go ahead and change it.





Robert

 

[doorgunner]

that won't make the speedometer and the tach disagree though, your ACTUAL speed would change, but your indicated speed wouldn't.

according to the gps and speedometer, my ranger at 60 mph turned 3,000 rpm.....I increased the tire diameter about 3"( just guessing), the gps read 55mph---the speedometer read 60mph---the tach read 2,500 rpm....


not that it has anything to do with solving 96's problem....just wanted to let you know......

 

[Snafu]

heres another wild guess not so much for the rpms but maybe for the fuel cuts, your inertia switch may be having trouble. when i got my 88 the hearer core leaked and was shorting out the switch, i bypassed it and it runs fine now, this is a guess however so i might be wrong :\

 

[heptofite]

Actual speed, is actual speed. Nothing is going to change that, it's impossible. Changing the diameter of your tires, will change your speedometer reading. Plain and simple.

you misunderstand, changing your tires size will affect your ACTUAL speed PER RPM, not your INDICATED speed PER RPM.

i'm really not sure what you thought i meant that you were correcting me for.