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

Help evap leak emergency

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Old Dec 1, 2023 | 05:52 AM
  #1  
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mford5352
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Joined: Nov 2023
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From: california
Default Help evap leak emergency

hello I am having some evap problems I first had the fuel cap replaced by my mechanic just to see if it would set off the code reader again and it did so I had paid 600 for the lines to be replaced and the fuel pressure sensor.

Then after the car kept throwing codes so I did the charcoal canister from the junkyard and a new vapor purge valve and it went away for a good couple months but the code ended up coming bac

now I have checked my purge valve replaced it again I put a fresh charcoal canister from a car that was recently crashed and I’ve checked all them using my ob2 reader which test the evap system and it says all of them open and it shows on the live data how they change when I turn them on and off

and I can’t see and big drops in the pressure it goes up constantly and doesn’t go down so I don’t see any leaks on the screen I’ve put a fresh fuel cap yesterday on top of that and I also did a full check of all the lines so now I’m just gonna drive it today and see if it comes back but I’m guessing it will

any recommendations I also keep seeing my ecu saying not connecting and the ecu fails sometimes which I find very weird but then they work after a minute anyways any recommendations now should I change my computer I am gonna do a smoke test before just to confirm that is the problem.

I also want to add that when I test a vapor valve which in my reader is vapor management valve 1 it makes the car idle really bad which I’m guessing is because it’s turning off so I know 100 percent that one is working and the charcoal canister so limpid is doing it’s job because it is holding pressure on my screen

I really need this fixed because I literally have to pass smog by tomorrow or pay some late fees so I want to fix this and drive my car if I can’t figure it out I am gonna be stuck
Old Dec 1, 2023 | 06:07 AM
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mford5352
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Old Dec 3, 2023 | 10:45 PM
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Edqe
 
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From: Nevada
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You check the FTP(fuel tank pressure sensor)I think it’s located passenger side on fuel tank
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