40 MPH engine vibration

[Gui272]

I seem to have a vibration from 40 to 47ish if the converter is locked and i'm getting on the skinny pedal.

I just replaced teh FICM not that long ago. it was down at the 38 v to 40 v range for who knows how long. I fiured it out when i put my CTS in that i had an issue with it. I'm the second owner so im' not sure how long the truck had a bad FICM in it.

any ideas whats wrong? My first idea ws injectors but i don't have any codes coming up.

any ideas?

thanks!

[scrapecc]

Mine did that when an injector was starting to go. But it came out of it when I have it the wood.

[F250SixOH]

Throw some rev-x in it. It can never hurt. Are you running a good synthetic?

[Lilpooh]

Have you checked all your u-joints and the carrier bearing.

[Gui272]

yeah, 5w-40 rotella T6 oil

U joints and carrier bearing look fine.

what willt the rev-x do?

[f250ghost]

Bad injector...have it scanned with a scantool...but youve got an injector going

[southend]

Originally Posted by f250ghost

Bad injector...have it scanned with a scantool...but youve got an injector going

I agree, my #4 injector is bad. shudders between 50-60, rev-x did not help.

[f250ghost]

Rev-X will only put a band-aid on it, if anything. I think I can speak more about this than anyone on the forum...trust me LOL