4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

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Old 03-25-2013, 10:39 AM
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jam23r1
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ok so i just put new spark plugs in the car 2 of them failed, so i fix that. put on a bbk 70mm T/B and trickflo neck. now im blowing off egr lins and my car is not running right. i think the catalytic converter mite be clogged. just can find whats rong no CEL. put scaner on the odb port and nuthing......
dont have the power i was makeing be for the spark plug went bad. some one help me



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Old 03-25-2013, 02:15 PM
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any one???
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Old 03-25-2013, 05:56 PM
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ok so its the differential pressure feedback sensor thats blowing off the lines
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Old 03-25-2013, 06:09 PM
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this guy is haveing the same problem,
So the hose fell off again last weekend while I was showing the car to my sister. The hose seems to fall when I put the car under heavy acceleration. That leads me to think its an issue with the exhaust creating pressure and making the hose falling off.

One of the things I looked at with a friend this weekend, is that the car doesn't have any mufflers. It seems to have 2" pipes and still has its cats. It sounds great inside the cabin, and it doesn't sound bad outside either. The sound get a little off when you hear it under acceleration on the outside.

My gut feeling at the moment is to get 2.5" pipes, drop the cats, and put in a set of mufflers (likely flowmasters because I like the loud obnoxious sound). I think this would maybe fix the issue with the EGR, plus leave my car with a better all around exhaust system. I don't understand why someone would remove the mufflers and leave the cats.

Anyway, the question is if you guys have any opinions or suggestions on what I should do or why you think my EGR hose keeps popping off. Thanks!
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Old 03-25-2013, 06:30 PM
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how tight is the line? I see in your sig that you have a blower. if the line is loose and then you start creating boost, the positive manifold pressure will blow off the line.
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Old 03-25-2013, 06:36 PM
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Originally Posted by school boy
how tight is the line? I see in your sig that you have a blower. if the line is loose and then you start creating boost, the positive manifold pressure will blow off the line.
i put clamps on it and it still blew off and the exhaust dont sound right.
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Old 03-26-2013, 02:43 PM
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The cats could be clogged like you said. Since my egr stuff is deleted, I cant look on my car to see where that black line you circled goes to.
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Old 03-26-2013, 03:31 PM
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Originally Posted by school boy
The cats could be clogged like you said. Since my egr stuff is deleted, I cant look on my car to see where that black line you circled goes to.
it go's to the copper line that go's to the EGR
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Old 03-27-2013, 03:53 PM
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bump...........
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Old 03-27-2013, 04:51 PM
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yea, sounds like youre getting excess pressure in the exhaust causing the line to push off. the exhaust or cats are clogged
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