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  #1  
Old 10-05-2010, 10:31 PM
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2003 Ford Expedition
 
Join Date: Nov 2009
Location: San Diego/Modesto, CA
Vehicle: 2003 Ford Expy
Posts: 181
01 5.4L Triton vacuum leak

Had this nice leak for a while and before I take it in to the shop and pay for a vacuum leak test I'll like to ask for you're guys opinion I have the P0171 P0174 so I've changed all 4 sensors (it has 150,xxx so I taught it was time) changed the vacuum line that has the pcv valve and goes to the back on the intake manifold changed the vacuum line that goes from the top of the manifold/tb to some valve thats right above the booster cleaned the maf and the idle air control valve also ive just changed the plugs. The idle is seems perfect no hesitations what so ever but it still throws the codes and with CA new DMV laws I cant get a 3 month permit anymore o with that said were else should I look or should I just take it in

its an 01 expy 5.4 awd/4x4 with 150,xxx

what will i look for if I think its the manifold it has one of those plastic ones???
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2003 Expy Xlt
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Exterior: Navy roof rack, mid blue HID lows, Yellow HID fog lights, led license bulb, 2in Belltech drop springs , 23' Saleens, SES Grill, 07 Navy Mirrors
Interior: Navy interior
Sound: Pioneer AVIC Z1, Boston Acoustic GT40 amp, Boston Acoustic Pro60, JL 750/1 HD, (2) JL W6v2, AudioControl DQX, AudioControl Epicenter
Money Wasters: K&N, Magnaflow Performance Exhaust, BBK underdrive pulleys, MSD ignition coils, SuperChips
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  #2  
Old 10-06-2010, 11:19 AM
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Location: cajun land
Vehicle: 2000 Ford F150
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Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow (because the EGR differential pressure sensor that monitors EGR flow is faulty and is under-reporting EGR flow
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2000 F-150 scab 5.4
150,000 plus miles.
SCT custom tune by Shakey!
Airaid since 2000
magaflow siso 3 inch catback
swaybar on rear
E-fans
BBK undrive pullys
75mm bbk
OBX long tube headers!
High Flow Cats.
Comp cams installed!
Cepek DC-1 17x9
Kumho 285-70-17
lowered two inches in rear
15.28 at 90.00 mph best time for now!
Time for upgrades!
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  #3  
Old 10-06-2010, 02:23 PM
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Join Date: Oct 2009
Location: Corona, Crazyfornia
Vehicle: 2003 ford f150
Posts: 2,179
Exhaust leak close to the sensors can cause those codes too.

Try an un-litpropane torch around all suspected vac leaks while the motor is running, change in RPM=vac leak. Fix as needed.

I hate Cal smog tests! If you clear the codes it will have a P1000 if the proper drive cycles have not been completed and that is a fail on the test. I don't think that the budget code readers will pick up the P1000, so make sure you are good before you go in.

Also how are the brakes? A leaking power booster will throw those codes too.

Good luck
Jim
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  #4  
Old 10-24-2010, 10:46 PM
Senior Member
2003 Ford Expedition
 
Join Date: Nov 2009
Location: San Diego/Modesto, CA
Vehicle: 2003 Ford Expy
Posts: 181
Ive used my superchip cortex to clear the codes that were i saw the p1000 ive changed the hose that goes to a valve on top of the booster and the brakes do feel a lil better but i still got the check engine burning bright
__________________
2003 Expy Xlt
_____________________________________________
Exterior: Navy roof rack, mid blue HID lows, Yellow HID fog lights, led license bulb, 2in Belltech drop springs , 23' Saleens, SES Grill, 07 Navy Mirrors
Interior: Navy interior
Sound: Pioneer AVIC Z1, Boston Acoustic GT40 amp, Boston Acoustic Pro60, JL 750/1 HD, (2) JL W6v2, AudioControl DQX, AudioControl Epicenter
Money Wasters: K&N, Magnaflow Performance Exhaust, BBK underdrive pulleys, MSD ignition coils, SuperChips
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  #5  
Old 11-13-2010, 02:15 AM
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Garage is empty, add now
 
Join Date: Nov 2010
Location: Las Vegas
Vehicle: 2004 Ford F-150
Posts: 7
Kr619,

Hving the same issue with my 04 FX4. any resolution ? ? ?
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Old 11-13-2010, 02:15 AM


 
 
 
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