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

EVAP & Fuel Pressure Problem

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Old Jun 25, 2009 | 05:39 AM
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BrightBlue00GT's Avatar
BrightBlue00GT
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Joined: Jun 2009
Posts: 11
From: CA
Thumbs down EVAP & Fuel Pressure Problem

No codes, but during my OBDII scans I am showing these failed tests:

$21 EVAPI (Evaporative Fuel Tank Pressure Initial Low-High...)
$25 EVAPRISEL4

And yes the car runs poorly. Feels like it has a misfire, but I'm sure it's not an electrical (plugs) misfire. Poor power, the fuel press gauge fluctuates almost in tune with what appears to be the misfire (again, it's not).

I assume I need to test the evap system. Any way to do that short of a shop doing it?
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