ok i have searched the hole forum about this tryed everything but most ppl that came up in the search had this prob when doing a t2 swap my car is all stock just swaped from at to mt plz help

 

On the auto transmission there is a vacuum hose that ran to the Vacuum Modulator. What did you do to this hose?

 

edit: ^^^ that's a good question

search '3800 RPM hesitation'

 

series of car helps...

could be limp mode.

 

First off, please use proper grammar. it get hard wen ppl all tipe netspk online u hav qwerty kboard us it

Second, is the car a S4 or S5? (86-88, or 89-91), because that may eliminate the possibility of limp mode, which is unique to the S5+ cars.

 

His profile "indicates" the car is an S4.

 

yes thank you i have an s4 and i dont know where that hose is located,
sorry my grammar bothered you so much. hope it didnt ruin your day

 

Do your reverse lights illuminate when you put the car in reverse?

I know that sounds like a cheesey question, but I'm wondering if maybe your reverse sensor and neutral sensor wiring may have gotten mixed up.

 

is your problem lyk mine? https://www.rx7club.com/2nd-generation-specific-1986-1992-17/weird-problem-wit-my-s4-928107/ if it is just replace the secondary injectors

 

not to sure ill check the battery is dead right now im going to jumped in a bit
but when it did it last time i was driving the car and i just let off as soon as it did it so ill see soon thanks

 

It ruined mine.


I vote for possibly clogged cats.

Depending on how clogged they may be, they will produce the same symptoms. Does it feel like it hits a wall at 4k or more like it struggles to get to 4k?

 

no it only dose it when im driving do you think i could be a AT ecu?

 

yes all my light work fine

 

Did you perform the transmission swap? And during the swap was the ground wire to the auto transmission refastened to the manual replacement?

 

S4's don't have an additional AT-ECU found in S5's. And the car does not use the secondary injectors while in neutral and not under load so you won't sense the problem in that situation unless you trick the car into thinking it's under load.

 

no i didnt perform the swap my self i bought it like this im not even sure what model it is

 

Carefully disconnect the vacuum hose to the Pressure sensor followed by capping the hose followed by unplugging the TPS and take the car for a ride and see if you can get the rpm over the 4000 mark on a rev such as taking it from the 3000 level to beyond.