Hello everyone i am new to forums and online help. My issue is the following: my truck seems to slip after certain rpms, the funny part is that this happens every time i get near the 3000 mile mark on my oil changes. So when i change the oil this problem goes away completely and doesn't start coming back until about 2500 miles on the new oil. I have changed the rear main seal on the motor, have changed the clutch many times, and slave bearing. I have changed the transmission fluid many times and have had it checked by a transmission specialist, they said the transmission is not the problem. I have also tried different oil grades, from the standard 5w-20 up, 10w-30, 10w-40, 20w-50! The only thing i notice is that the thicker the oil, the longer it takes to start the slipping and jerking feeling. Also, the longer i go the less mph i am allowed to reach before it starts jerking again.

Truck info: 2000 3.0 flex fuel, manual transmission XLT with four doors. Rebuilt motor with 100k and 250k on the chasis (she is definitely a work horse).

Could this be a fuel delivery problem? or a camshaft sensor problem? also, nothing shows up on my check engine light.

 

I can really use some help here guys....

 

Maybe you have a lot of sludge In the engine. Try doing a seafoam treatment in the oil next time you want to change it. I believe there is a how-to on here. Basically you dump some in the oil. Run your engine a bit then do the normal oil and filter change.

 

Thank you I've been meaning to try that stuff, someone also told me it may be loss of oil pressure, not sure yet though.

 

Could be it also. I'm not that knowledgeable on things like these but just suggestions from what I have read. Maybe your fuel pump is going bad also and the engine is not getting enough fuel to maintain 3k rpm...