I have a 75mm throttle body and huge intake manifold , ill see if i can get a pic of them. anyways all vaccum lines are hooked up everything is there. i went with a aem fual rail because the pressure regulator was in the way and the injectors would not seat flush. now its all hooked up is starts and runs but it will not rev past 2500 its hits 2500 and stutters like its hitting a rev limiter . it ran fine befor without any problems so i dont beleive its a ecu problem as the tech sugested. Dont really know where to go from here any help would be beneficial thanks

 

 

Obviously something is not fine. Sounds like its in limp mode. CEL?

 

http://a913.ac-images.myspacec...8.jpg

 

im not sure what limp mode is ? I posted a link of a pic i know it wont help but at least you can see the manifold and thorottle body . sorry i dont use forums much ... what is (cel?)... ?

 

That looks like a nicely designed plenum on that manifold, who makes it?

CEL = Check Engine Light.

Limp Mode = Certain CEL codes will cause the car to go into limp mode, meaning theres a really low rev limiter + retarded timing and extra rich fuel mixture.

 

Bolt on a stock throttle body to see how it runs.

 

i hope you have 98+mm of stroke for that kind of TB.

it looks similar to a JUN IM to me. i saw some knockoff of the JUN IM.

 

It doesnt matter how much stroke he has. Bigger ports and induction related parts make more power. I know because i read a thread with no real discussion of why or how.

 

o yeah, big ports work well. specially those square ports. best ports ever.

 

Gigantic square ports with stock sized valves are the hot ticket. Lets see, ive got a 3" opening at point A, and a 1.2" opening at point B. To flow more air, ill just open point A to 10" while leaving point B untouched!

 

that equals maximum velocity. big opening small exit right.

 

Yep. Because you can never have an abundance of air speed. *shifty eyes*

 

thats what i read about. "hog them ports out more air more power"

 

We must subscribe to the same magazine.

Fast Fords & Mustangs?

 

not quite but jimmy devine special. mopar boy.

 

Mission: Thread Destroy successful.

 

agreed, but id like to say it just got a little OT.

back to the topic at hand.

 

seems like the tps and map are swapped.

 

sorry i have not kept up on this discusion, i have been outside all day shoveling a foot of snow, i hope the tps and map are swapped that would be an easy fix . this manifold is infact a jun knok off, i said it was ouf kurisawa japan but it shipped from thiland. and i can not bold up a stock tb it would not fit the i dont know if the tb i bought is pictures but it is a 75mm and it was for sale by the same company that i bought the intake from . convienint

 

if the tps and map were switched it would be sputtering and coughing real bad, leaving hydrocarbon deposits on the driveway just south of the tailpipe. maybe even a backfire or two.

 

nope none of that businiess is going on . it just hits 2500 and bounces like a rev limiter. i wish they could figure it out but as far as performance shops and tuners. here in minnesota they are not on every corner take what you can get in mn

 

Its obviously something electrical.

IACV and something else in the proximity are identical connectors. could have those switched. wouldnt be any obvious symptoms, just limp mode.

Get a multimeter and start troubleshooting.

 

sounds like to me u need to switch out ur fast idle control valve.

 

if you are obd1 just plug in and see whats up! simple

if obd0 then:

not the FITV i dont even run one

it is the TPS
but the tps might not be busted might just need to be adjusted

also just to be certain get a new IACV it will smooth things out if it has gone bad

same "exact" problem has happened to me twice, both times it was something with the TPS

try taking the plug off of your tps, it wont get worse because its no good put it back on
take off your map sensor vacuum line, it will run worse if working put it back on
unplug your IACV wire clip, see if gets worse or not to see if it is working

then update us