whenever im going out 30mph and floor it it just seems to stay in the same gear and doesnt down shift.. the rpms just go up slowely... it shifts fine thought just regular driving anyone kno what might be the problem

 

What is "it" and what mods have been done. What was done most recently and when?

g

 

when i floor the gas pedal... i only have pcm4less tune, exhaust and cai but that was all done last year.. my car has 114000 miles on it

 

Did this just start recently then ?

 

Well not knowing what kind of transmission I am talking about.......... the 1st thing to know I suppose is what is your transmssions fluid condition? How old is the fluid / filter?

g

 

i had a similar problem and it ended up being my map sensor... describe it more.. so when you floor it above 30 it wont downshift? or below 30?

 

right around 20 to 40 mph.. from a stop it does fine and around 50 and up it does fine.. i was driving it today and it seemed to help if i put it in 3 instead of D.. if your driving around town at about 30 and about 1500 to 2000rpms shouldnt the rpms just up to 4500 to 5000 real quick when you floor it

 

its the stock 4l60e with 114000 miles on the transmission

 

What gears do you have...30mph is about the cutoff point...above that it shouldn't be downshifting. I think your car is normal.

 

Thanks for the details.

How long have you had your mail order tune loaded?

Be sure to check the TPS or have it checked.

Are you giving it maximum 100% WOT and it still will not downshift? Sounds like it. It should initiate a 3/2 downshift, and it sounds like it is not. Have that solenoid inspected for proper operation. I have found over the years that the electro-mechanical part is a very likely culprit.

Also, can you feel the torque converter unlock at say over 45 MPH when you are accelerating form a steady cruise? Just curious....

g

 

ive had my tune 4 about a year now

 

While it could be the tune if its been working ok for a year its not likley , I would look at the data signals from the TPS,MAF with a scanner and see if they are giving proper readings. You dont have to set a code for a sensor to be off , Codes only set if the sensor is out of its entire range

 

I agree, not likely to be the tune.

Sounds like the 3/2 solenoid to me, it could be staying in lock up under moderate acceleration though..... get a scanner on it and watch what is happening!

g