the Z still uses vacuum lines to tell it when to shift and how much line pressure???? tell me it is not true. this is older technology and i would hope it to be run in the ecu via throttle position and rpm.
anyways, why not try the old valve body and see if you have the same problem. that would answer alot of your questions, would it not? btw- spring a few bucks and get new tranny fluid. if anything it will save you more flaming in the future.

 

My car has a MANUAL GEAR BOX no auto here. He has the auto and we both have the same problem. And i spoke to soon because my problem came back!!! ARGH!! futher diagnostics to continue....

 

if the problem persists, then it is a problem with the install. if it goes away, then you have a defective part. you need to put in the wrench time and figure it out. or pay someone to do it.

 

The problem seems to be when the car is cold. This morning the problem was there and after about 30 mins of driving the car it started "fading away" ( not doing it as much ) until it was gone by about 45mins. Weird. no CEL, inconsistent, Lets see what happens. And it all started after the DEALER replaced my trans!! ARGH!

 

Still doing this problem, going to have to take it to dealer on tuesday, will let you know what they find.

 

I don't mean to hijack the thread, but @post #49 ZZZYA mentioned the possibility of a hi-flo cat gone bad and clogging the exhaust. I got concerned when I read this, as I have hi-flos, and have not heard of this problem. Has anyone experienced this? Thanks.

 

reseted ecu by disconnecting the neg. and added more fluid and still feels the same. now going to reinstall every again if it does work i will go to deallers. does anyone know if the deallers can tell if i upgraded the valve body and void the warranty????

 

Well my car is at the dealer and still under warranty. they say it is the mass air flow sensor. lets see what happens when i get it back.

 

LOL!! (Live an learn)

 

took it out and put it back in and it feels the same so i am droppin it off at the deallers on wednesday.

 

jus wonder if there are any plug in the valve body that would make my car run like this or that the 04.5 and 05 valve body are the same.

 

DUDE its NOT your valve body, trust me man, just leave the valve body in and take it to the dealer if your car has warranty, just tell them it started doing it out of no where, ill tell you what the problem was once i get my car back, trust me!

 

i brought it to the deallers and they told me it was the ecu because no codes were comin up, so there order me a ecu and there are installing it on wednesday

 

they install new ecu and still act the same so i just left it there.

 

i will get my car back tommarow its been there a awhile so we will see if its the MAF sensor ithink it is so tell them to change that

 

dam how long has it been there. and they gave me a hyundai to drive ;(

 

Honestly, you give a bad name to high school kids everywhere!
And what the h3ll were you thinking letting a "buddy" do a valve body installation on a car that has 850 miles on it?!

 

Dude my car has been at the dealership for almost a month, I miss driving it!! They said monday at the latest.... Lets see what happens. Ill keep you posted!

 

WOW.. i dont want to drive a hyundia for a month. hope it take less then a week for me.

 

It makes you appreciate what you have...now I hope you have learned a very important lesson...dont f*ck with the car unless you know what you are doing. I still think it is somthing else...these techs dont know half as much as they think they do.You might find another dealership can find the problem and fix....shouldnt be that way but it is.