Ford Mustang 2004 V6 3.8L OBD codes P0461 P0316 P0303

ShouldahadaV8

New Member
Mar 6, 2019
1
0
1
24
94541
Hello broke college student here that would rather learn how to fix a car than take it in.

odometer: ~135000

04 convertible mustang V6 showed p0461 OBD code initially just causing the gas gauge to fall to empty only on the last quarter tank. I just filled up at that point and left it.

P0316 and P0303 showed up after i experienced a loss in power and rough idle. I replaced the spark plugs, wires and even the coil pack. Problem came back so i replaced the MAF sensor. and it came back again. I then replaced my fuel injectors and the car ran fine for about 200 miles before the problem came back and almost worse. Complete loss of power when going uphill its embarrassing (barely pushing 20 mph when flooring it) and some loss of power when accelerating on the freeway. There is definitely hesitation and jerking when driving at some higher speeds and the car changes gear.

After some research im guessing it could be the fuel pump/sending unit or FRP sensor. I am trying to save money so any recommendations would be great on how to diagnose or what the issue might be.
 
  • Sponsors(?)


wmburns

SN Certified Technician
Aug 14, 2009
5,807
499
164
Houston Texas
First thing. Stop. Put down the "parts changer" method to "fix" cars.

IF you really are interested in saving money then it will be necessary to spend a small amount of money on a tool that will pay for itself many times over by saving one from replacing good parts that don't fix the real problem. I hazard to guess it could have paid for itself already if used from the beginning. In addition it will help you to learn HOW to understand a modern car really works.

ForScan ODB2 scanner w ELM327 USB
https://www.stangnet.com/mustang-forums/resources/forscan-odb2-scanner-w-elm327-usb.57/

Here's some information on where IMO every possible electrical problem should start.

Howto perform charging system voltage drop test
https://www.stangnet.com/mustang-fo...perform-charging-system-voltage-drop-test.56/

Once you have access to an ODB2 scanner that is capable of monitoring and/or graphing operational PID's, this will give access to the data needed to get a "toe hold" on the problem and start the trouble shooting process.

For example, IF you truly believe that it's a fuel rail pressures sensor problem (FRPS), then using the ODB2 scanner it's an easy process to cross check the fuel pressure with an external gauge. While you are at it, double check that the FRPS intake vacuum reference line is connected and leak free.

Also possible to cross check the FRPS with the long term fuel trims (LTFT) values.

In short, work on a theory. Use the ODB2 data to either prove it or rule it out.

Advice. Focus first an any misfire related DTC codes.

If you insist on looking for a part to change, then look for possible crank damper damage.
 
Thread starter Similar threads Forum Replies Date
S Best 99-04 Mustang GT clutch kit replacement? SN95 4.6L Mustang Tech 1
Robert. A Kelsesky My 2004 Ford Mustang convertible 40th anniversary edition 1996 - 2004 SN95 Mustang -General/Talk- 3
MoDriver For Sale 1997-2004 Ford Mustang Front Right Passenger side ABS sensor F7ZC-2C204-AA Wheels Tires Brakes 0
MoDriver SOLD 94-2004 Ford Mustang Black Center Console W/2 Cup Holders Interior Exterior Parts 0
Chythar For Sale 2001-2004 Ford Mustang Center Console, Black Interior Exterior Parts 3
Chythar Expired 1999-2004 Ford Mustang Gt Cobra Power Seat Track With Switch Interior Exterior Parts 0
S Expired 2004 Ford Mustang Premium, V6 40th Anniversary Edition SN95 Mustangs For Sale (1994-04) 0
Mooney35 Electrical Problems 2004 Mustang Gt SN95 4.6L Mustang Tech 2
'94ChickStang Expired 2004 Ford Mustang Svt Cobra Convertible (under 8,500 Original Miles) - $26,000 SN95 Mustangs For Sale (1994-04) 0
R SOLD 2004 Ford Mustang, 24,352 Miles, Buena Park, Ca, $6,000. SN95 Mustangs For Sale (1994-04) 0
B Help! 2004 Ford Mustang Gt Premium Ed.. Just Rplaced Intake Manifold And Now Hearing Bubbling Sound 2005 - 2014 S-197 Mustang -General/Talk- 2
J Expired 2004 Ford Mustang Mach 1..only 900 Miles!! SN95 Mustangs For Sale (1994-04) 3
SteveWolf Expired 2004 Ford Mustang Conv. 40th Anniv. Edition - St. James, Ny SN95 Mustangs For Sale (1994-04) 0
astronut1885 Expired Ford 1983-2004 Mustang Leather 5-speed Shift Knob Factory Replacement Interior Exterior Parts 0
astronut1885 Expired Ford Racing 1983-2004 Mustang Leather 5-speed Shift Knob Frpp Interior Exterior Parts 0
astronut1885 Expired Billet Aluminum Trunk Decklid Lock Bezel Trim For 1999-2004 Ford Mustang! Interior Exterior Parts 0
astronut1885 Expired 1999-2004 Ford Mustang Turn Signal Billet Aluminum Cover Multi Function Switch Interior Exterior Parts 0
astronut1885 Expired 1999-2004 Ford Mustang Front Cup Holder Billet Aluminum Trim Ring Cheap! Interior Exterior Parts 0
astronut1885 Expired Ford 1983-2004 Mustang Leather 5-speed Shift Knob Factory Replacement Interior Exterior Parts 0
astronut1885 Expired Ford Racing 1983-2004 Mustang Leather 5-speed Shift Knob Frpp Interior Exterior Parts 0
E Expired 2004 Silver Ford Mustang Gt Premium - Los Angeles SN95 Mustangs For Sale (1994-04) 0
R Expired 2004 Ford Mustang Cobra Convertible - Whipple Supercharger 600 Rwhp SN95 Mustangs For Sale (1994-04) 0
S SOLD 2004 Ford Mustang Convertible GT 40th Anniversary Edition 5 sp Lw Mile - $9500 (NE Fresno) SN95 Mustangs For Sale (1994-04) 0
P 2004 Ford Mustang 40th Anniversary SN95 4.6L Mustang Tech 1
U SOLD 2004 Ford Mustang Mach 1 (blue Ext./black Int.) SN95 Mustangs For Sale (1994-04) 1
MRaburn Brothers Performance 1998 – 2004 Ford Mustang Fuel Pump StangNet Site News 0
Want2GoFaster Genuine Ford Racing Rear Cobra Brake Upgrade Kit 1994-2004 Mustang Gt Wheels Tires Brakes 1
G 2004 Ford Mustang Coupe 5-Speed 59,xxx miles!We can finance anyone $7,995! SN95 Mustangs For Sale (1994-04) 0
D 1999-2004 Ford Mustang GT Trunk Deck Lid Blackout Decal Interior Exterior Parts 2
F 2004 Ford Mustang GT 40th Anniversary Modded SN95 Mustangs For Sale (1994-04) 1
N 2004 Ford Mustang Mach 1 $13,500 NJ SN95 Mustangs For Sale (1994-04) 1
A 2004 Ford Mustang GT Convertible ($3500 in extras) - $12000 SN95 Mustangs For Sale (1994-04) 0
MRaburn 1996-2004 Ford Mustang Technical Service Bulletins StangNet Site News 0
T FS: New Spectre Air Intake System Ford Mustang GT 4.6L 1996-2004 Engine and Power Adder Parts 6
Z New 2004 Ford Factory Mustang GT mufflers and muffler tips Exhaust Parts 4
S 2004 ford mustang v6 1996 - 2004 SN95 Mustang -General/Talk- 1
F 2004 FORD MUSTANG MACH 1 CONVERTIBLE <<MY PROJECT CAR>> SN95 4.6L Mustang Tech 106
J Check out the 2004 Ford Mustang Cobra in Mystichrome SVT Tech Forum 0
H For Sale 2001 ford mustang gt procharged $14,000 SN95 Mustangs For Sale (1994-04) 0
J 2001 Ford Mustang Cobra SVT Convertible Fuel Smell help 1996 - 2004 SN95 Mustang -General/Talk- 2
M Windshield wipers only work on high. Washer fluid not working. 2010 - 2014 Specific Tech 0
Misti 2000 Ford Mustang GT 4.6 - Rear Differential 1996 - 2004 SN95 Mustang -General/Talk- 12
J 2001 ford mustang v6 misfire and running lean 1996 - 2004 SN95 Mustang -General/Talk- 2
U 2001 ford mustang v6 3.8l shutting off on me SN95 V6 Mustang Tech 3
T Fan not turning on 1983 3.8 Fox 5.0 Mustang Tech 0
A Wrench Light Mustang GT 2005 - 2009 Specific Tech 6
S 2001 Ford Mustang front seats 1996 - 2004 SN95 Mustang -General/Talk- 0
M 1968 ford mustang coupe engine swap budget 1965 - 1973 Classic Mustangs -General/Talk- 2
ryansgts 2000 gt e85 conversion? 1996 - 2004 SN95 Mustang -General/Talk- 0
Misti 2000 Ford Mustang Gt 4.6 - Waterpump 1996 - 2004 SN95 Mustang -General/Talk- 4
Similar threads