Well Lets Get The Whole Story Out First Off

7 Months Ago...
No Issues At All But An Optispark Code

Got Off The Highway ANd Came To A Stop Sign
Take Off And First Second And Holds In 3rd....

End Up Parking It For The Winter
Change Optispark And Test Drive

Same 1,2, and holds 3

Hook-up Snappy Scanner And Read Current Gear ANd When You First Start Off It Show 1... 2.... 3.... Never 4th And Once It Gets To 3 Never Gots Back To 1 on scanner

Few Weird Things Puts Out A Code 79 Which Has Trans Temp Too High But When You Read The Data Everything Looks Fine

Fluid Looks Normal And No Burnt Smell

Any Ideas????


Thanks All

 

is your speedo working? test tps. check the wiring and plugs to the trans

 

Speedo Is Good
TPS Reads At All Points
And Plugs All Same Tight

 

if everything checks out i would say its in the wiring inside the trans. might try resetting the shift cable. 41 on the list here 4th Gen LT1 F-Body Tech Aids

 

I Will Looking Into That Today... That Would Really Be The Best Way To Say What The Car Is Doing To A T...

All Gears It Shift Are Strong Just No Up Shift To 4th Just Like If You Were Selecting 3rd