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post #1 of 5 (permalink) Old 07-11-2003, 07:05 AM Thread Starter
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Good Ol Gas

Alright, Ive posted serveral times. I replaced almost everything that could cause the problem.

New plugs, Wires, PCV, and o2's

What else can be cause my problems?

I had P0172 for awhile but i can it removed. What can it be?

I get less then 225 on a full tank highway...

1996 Thunderbird 4.6 -Sold-
259.4 hp and 285.3 tq on mustang dyno
Bunch of motorcycles
2004 F150
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post #2 of 5 (permalink) Old 07-11-2003, 09:21 AM
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Ouch....a lengthy list of things to check came up when I checked the 1996 Service Manual:

Diagnostic Trouble Codes (DTCs) P0171 bank (1) (cylinder #1) and DTC P0174 bank (2) indicate the fuel/air ratio is too lean. The fuel adaptive system is at the rich correction limit.

DTC P0172 bank (1) and DTC P0175 bank (2) indicate the fuel/air ratio is too rich. The fuel adaptive system is at the lean correction limit.

DTCs HO2S Reference list:
HO2S-11 = DTCs P0171 and P0172
HO2S-21 = DTCs P0174 and P0175

Possible causes:

Fuel system:
Excessive fuel pressure.
Leaking fuel injector(s).
Leaking fuel pressure regulator.
Low fuel pressure.
Contaminated injector(s)

Induction system:
Air leaks after the MAF.
Vacuum leaks.
Restricted air inlet.
PCV system.
Fuel purge system.
Improperly seated dip stick.

EGR:
Leaking gasket.
Stuck open EGR valve.
Leaking diaphragm.

Base engine:
Oil overfill.
Cam timing.
Cylinder compression.
Exhaust leaks before or near the HO2S's.

Check air intake for leaks, obstructions and damage.
Check air filter, air filter housing for blockage.
Verify integrity of the PCV system.
Check for vacuum leaks.
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post #3 of 5 (permalink) Old 07-11-2003, 10:02 AM Thread Starter
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grrr how i check these things? I can't find a leak anywhere. all my fluids are great

1996 Thunderbird 4.6 -Sold-
259.4 hp and 285.3 tq on mustang dyno
Bunch of motorcycles
2004 F150
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post #4 of 5 (permalink) Old 07-11-2003, 12:18 PM
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Pull the new plugs on the bad side - my hunch is a fuel injector(or more) is hung wide open. Some of the plugs will be really black and sooty compared to the rest of them, it should be a giveaway.

96 Mustang GT 5spd. w/ 248A Option (GTS). Stock for now until I get the Roush on.

97 Thunderbird 4.6L LX /w Sport Package
24k B&M Cooler, 1" lowered, Steeda UD Pulleys, Dynomax cat-back, J-mod, 3.73's, PI intake, PI cams, 03 GT MAF/Tube, SCT tuned - Gone but not forgotten.
MAMN12 Drag Racing Team [email protected] In need of updated times.
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post #5 of 5 (permalink) Old 07-11-2003, 12:32 PM
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Quote:
Originally posted by KrAzyT
grrr how i check these things? I can't find a leak anywhere. all my fluids are great
I suggest you take it to a shop who knows what they are doing if you can't do these things.

Good luck with it.
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