Recently I just realized at exactly 50MPH my truck just stops revving.

It'll jump into 1st, 2nd.. ect, then at 50 it'll just stop. Then I'll step on the gas and it will slowly increase, but when I do that my truck will make a load rev, quiet, loud, then increase speed slowly.

I mean, I've had no issue with my transmission. I'm not sure if maybe this has something to do with air flow, vacuums.

I'm mostly certain my truck has a blown plenum, clogged cat. I just haven't had the time to fix it.

I'm just wondering if there is a reason my truck stops giving power at 50mph

 

clogged cat.. almost certainly..

 

Try removing the precat O2 sensor and see if it runs faster/better

 

Do I remove the sensor completely, or just unplug it?

 

remove it completely

 

I tried to follow where the connecter goes to, but I couldn't get that darn thing off. I didn't wanna force it off. It was hard to get in there without the truck being up alittle bit. I don't have jacks, so I might have to wait for a bit.

Recently it changed how it would rev. I would go about 40mph, the truck would rev up to 50 then just stop revving. Then after that it'll be a very slow accelerate and then it would be fine when I hit 65. But when I press on the gas the truck will rev loudly then start taking off. But it just sounds wrong, like it's putting a LOT of load on the truck just to accelerate a little.


Someone also mentioned a clogged fuel filter might be the cause? I'm gonna go get a Fuel Pressure gauge soon and see what I'm reading.

 

you dont need to disconnect it from the plug/wire. just unthread it out of the pipe and zip tie it away from the pipe.

and for the fuel pressure test: the pressure should be somewhere from 45-50 psi.