I thought i had a miss on my 01 5.4 super duty had a mech. check everything ,no codes,no check engine everyting was perfect with the engine.But they said possible that the tourqe converter not unlocking?Anyone ever heard of any thing like this?

 

It's possible, but it would act like you forgot to push in the clutch and bog the motor until it died when coming to a stop.
How many miles on it and has it ever been tuned up?

 

83000 miles,and yes it has be tuned up recently.there is something going on with the engine?but no codes or check engine light?

 

Sounds more like the TC not LOCKING.

Does the "miss" happen when accelerating slowly/moderately, and at about 30-45MPH?

 

I had the trans. checked out everything was ok?you can feel the miss sometimes at idle?

 

How about a vacum leak
Pcv valve elbow hose
How about a dirty Maf
Iac circuit dirty
Bad sprkplug boots
sprkplug loose in the hole
Cop going south
Chk cyclinder misfires
remeber we are OBDI things don't post codes or chk eng lights unless really bad.

Rich

 

elbow hose is good,just had the plugs changed autolite double platium,no cracks in plug boots,clean maf,cleaned with elect. contact cleaner.I cant figure out what is wrong and no one else seems to be able to figure it out.Mech. says he cant fix anything if there is no codes?or he said he could just start replacing parts hoping it will fix it?

 

Sounds like it needs to be driven with a good scanner that logs live data to see what is going on.

 

the mech that did the work for me said they drove the truck with a scanner hooked up ,and nothing showed up even when it would miss,and the miss is very noticeable.