my 2008 f250 6.4l just got out of the shop a week a go new small block and new pistons, throwing #1 constrabution code,map sensor and #1 cil missfire you can hear air come out of the intake, im guessing valve train or lifter..... other problem two days after the truck throwing the codes i went to take it to the shop and would barely drive floored stuggle to go 10mph put it in park rev up normal will go in reverse normal just no power in drive, no transmission codes, had it towed to the diesel shop, mech said might be a fail safe on transmission from the engine codes?? any help here? it has egr/dfp h&s mini maxx tuner, the truck has 170k on body 11k on new engine before the new block that was put in last week.

 

oh and all fuilds are good....

 

i'm no expert but it sounds like it may have a torque converter problem

 

good point....thanks ill look into it

 

wait till Mark K chimes in...he is the best tranny expert on this forum

 

Why does everyone immediately go to the torque converter? Is it the only part of the transmission you can identify? How in the world could it be the torque converter if it works in reverse but not drive? How would the torque converter do that? How would the torque converter know that the trans is in reverse and not drive?

I think it is in a fail safe mode. Get the engine fixed and the trans will probably be fine.

 

thanks mark. Good point.