V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters

LT header problems

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Old Dec 29, 2006 | 10:36 PM
  #1  
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Default LT header problems

Ok so they are on as well as the or H pipe but I have no mufflers right now. The problem is the car decided to start runnin like ****.It starts sputtering and the RPMs drop like its about to die then it magically roars to life and is fine. It feels kinda like theres somethin wrong with the air, like the engine is having breathing issues. Could this be from the severe lack of back pressure or should I look for something else...
Old Dec 29, 2006 | 10:54 PM
  #2  
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Default RE: LT header problems

do u have cats

do u have a mil iliminator

if u have neither the computer has gone into limp mode
Old Dec 29, 2006 | 11:01 PM
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Default RE: LT header problems

sounds like you need a tune!
Old Dec 29, 2006 | 11:09 PM
  #4  
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Default RE: LT header problems

I dont think catless exhaust will set the computer off. However, it is your computer shutting your engine down.

You need MiL Eliminators to run an H-Pipe i believe. Pick some up on overnight shipping and hook up a catback exhaust system to it. Go with Magnaflow.
Old Dec 29, 2006 | 11:39 PM
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Default RE: LT header problems

"Malfunction Indicator Light Eliminators, are electronic devices that prevent your "Check Engine" or "Service Engine Soon" light from coming on when an offroad H or X pipe is installed on a late-model vehicle with OBD-II emissions systems. If you install an Offroad H or X pipe on your car without MIL Eliminators, your "Check Engine" or Service Engine Soon" will always be on, and you won't have the opportunity of being alerted if something more serious is wrong with your vehicle."

i would suggest getting your car dyno tune, it will most likely get rid of this problem and you might free up some ponys
Old Dec 29, 2006 | 11:52 PM
  #6  
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Default RE: LT header problems

if u run a car with out the eliminators it will set off the light and go into limp mode which will make the engine run funny and stall and burn gass like crazy

all u have to do is get mil eliminators and get some one to clear the code on the computer with a scan tool or a programmer

or u could just get a programmer and turn the 02 sensor off and clear the code



Old Dec 29, 2006 | 11:54 PM
  #7  
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Default RE: LT header problems

I put the mil eliminators on the same day
Old Dec 29, 2006 | 11:58 PM
  #8  
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Default RE: LT header problems

do u have a light and did u start it with the new midpipe before u installed the eliminators
Old Dec 30, 2006 | 12:11 AM
  #9  
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Default RE: LT header problems

sounds like the idle air controller is not working right.
Old Dec 30, 2006 | 12:15 AM
  #10  
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Default RE: LT header problems

Yes a light popped on today and I dont think I did



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