Help with code P0171
#1
Help with code P0171
Hey everyone I'm a new member. And I'm having an issue with code P0171 system too lean bank 1 on my 2004 GT. This code has been coming on and off by itself for 6-8 months now. I know it's the passengers side. I recently changed the intake manifold because it was leaking at the heater core. I also changed all these parts to freshen up the engine. Need help on what else to do thanks!
PCV Valve
Camshaft positioning sensor
Crankshaft positioning sensor
idle air valve control
Throttle body positioning sensor
Throttle body gasket
Intake manifold gasket
MAF
PCV to upper intake vacuum hose
Exhaust Gas Recirculation Pressure Feedback Sensor
Front o2 sensors
Fuel injectors
CAI filter
PCV Valve
Camshaft positioning sensor
Crankshaft positioning sensor
idle air valve control
Throttle body positioning sensor
Throttle body gasket
Intake manifold gasket
MAF
PCV to upper intake vacuum hose
Exhaust Gas Recirculation Pressure Feedback Sensor
Front o2 sensors
Fuel injectors
CAI filter
#2
Legacy TMS Member
You've done the stuff that most guys throw at this code. It is usually a vacuum leak. Take a good can of Berryman's B12 and lightly spray around the intake plenum and where the TB mounts and all the hoses. It is usually a very simple cure for this and P0174. If you go out the 1997-2003 section on F150 Forums, type in those codes and you'll find a 1000 answers. It is very common for 1997-2004 Fords with 4.6 throwing this code. Hope this gives you a start and end to your problem. Good luck.
http://www.f150forum.com/search.php?searchid=10752937
http://www.f150forum.com/search.php?searchid=10752937
Last edited by akdoggie; 2/1/16 at 02:00 PM.
#3
Ok I'll try that it's been driving me nuts.. And I have a vacuum gauge on my gauge pod and it reads normal.. But do I hear a noise coming from the passengers side by the heater core hose
#4
NTTAWWT
Gonna sound nuts, but try changing the alternator. I had a problem years ago that we just could not solve, and I changed a list as long as yours. Apparently the alt was sending bad electrical signals through the system and causing everything to go haywire.
#6
NTTAWWT
Good thing about the mod motors is that they're not quite as computer based as the newer 4.6's and 5.0's. They're relatively easy to diagnose.
#8
Legacy TMS Member
#10
So I took the car in to be leak tested with the smoke machine. NOTHING.. Lol car is solid with no leaks on the vacuum lines. They did notice some some leaking out of where the CAI housing meets the MAF meter. They said that was the cause. So I siliconed everything. Your guys thoughts on that?
#11
Legacy TMS Member
As long as you use sensor safe silicone, why not. If you don't have that kind of silicone, I'd say stay away from it. Permatex #6 (BR) is not safe. Just so you know. Most of the others are ok. 598 (BR) is good to use but the #6 stuff really messes with sensors and screws things up badly.
#12
Thanks so I did the silicone thing and I also changed the fuel rail pressure sensor. Still getting the same thing. Do you think it could be the CAI? Mine sits inside the fender well. Should I try one that sits inside the engine bay?
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