Jack Schmidt
Member
- Joined
- Jan 17, 2013
- Messages
- 32
- Reaction score
- 16
- Points
- 8
- Location
- San Diego County
- Vehicle Year
- 2003
- Make / Model
- Ranger
- Engine Size
- 4.0L
- Transmission
- Automatic
- 2WD / 4WD
- 4WD
2003 4.0 SOHC, ~120k mi.
I'm getting too-lean trouble codes on both banks. Here are two freeze frames, a day or two apart, the second one after MAF cleaning:
DTCFRZF P0174 P0174
FUELSYS1 CL CL
FUELSYS2 N/A N/A
LOAD_PCT(%) 56.1 87.5
ETC(degF) 190 189
SHRTFT1(%) 12.5 13.3
LONGFT1(%) 20.3 24.2
SHRTFT2(%) 10.9 18.8
LONGFT2(%) 25.0 25.0
RPM(/min) 2366 2708
VSS(mph) 70 40
SPARKADV(deg) 29 16
IAT(degF) 66 88
MAF(lb/min) 5.456 9.074
TP(%) 29.4 44.7
O2B1S1(V) 0.095 0.290
SHRTFTB1S1(%) 12.5 13.3
O2B1S2(V) 0.665 0.390
O2B3S1(V) 0.13 0.265
SHRTFTB3S1(%) 10.9 18.8
When I unplug the IAC the engine dies immediately. Cleaning the MAF sensor, I removed virtually zero gunk. O2 sensors are probably original.
I started getting the trouble codes very shortly after I manually tripped the fuel line gravity switch (for anti-theft), returned to the truck and tried to start it before remembering to reset the gravity switch, then switched it on and started the truck normally. I don't know if this has anything at all to do with my trouble codes.
I installed a new fuel pump assembly a few months ago, supposedly OEM from NAPA Auto Parts. And I installed a new fuel filter and fuel relay about 1k miles before that.
At the moment I suspect the fuel pump, even though it's almost new, or maybe something else in the fuel path? When I turn on the fuel pump I hear the normal "zzz" of the motor but the pitch starts high then goes low and stays low, exactly like the sound made when starting from zero pressure due to a bad fuel check valve. Along with the "zzz" I hear a "shhh" in the tank as if air or foam is being pumped. I don't think I've ever heard the "shh" before. After I turn off the fuel pump the "shhh" continues, fading out over about three seconds. The tank is completely full. I don't smell fuel anywhere.
I don't have a fuel pressure gauge but would like to get one. What's the best way to install one? I don't mind if it's just under the hood or even temporary. My previous ranger had a pneumatic valve on the fuel rail but this truck doesn't.
Am I jumping too quickly to blame the fuel pump?
Maybe the gravity switch? I tried tripping it and resetting it and tapping on it -- no help.
I'm getting too-lean trouble codes on both banks. Here are two freeze frames, a day or two apart, the second one after MAF cleaning:
DTCFRZF P0174 P0174
FUELSYS1 CL CL
FUELSYS2 N/A N/A
LOAD_PCT(%) 56.1 87.5
ETC(degF) 190 189
SHRTFT1(%) 12.5 13.3
LONGFT1(%) 20.3 24.2
SHRTFT2(%) 10.9 18.8
LONGFT2(%) 25.0 25.0
RPM(/min) 2366 2708
VSS(mph) 70 40
SPARKADV(deg) 29 16
IAT(degF) 66 88
MAF(lb/min) 5.456 9.074
TP(%) 29.4 44.7
O2B1S1(V) 0.095 0.290
SHRTFTB1S1(%) 12.5 13.3
O2B1S2(V) 0.665 0.390
O2B3S1(V) 0.13 0.265
SHRTFTB3S1(%) 10.9 18.8
When I unplug the IAC the engine dies immediately. Cleaning the MAF sensor, I removed virtually zero gunk. O2 sensors are probably original.
I started getting the trouble codes very shortly after I manually tripped the fuel line gravity switch (for anti-theft), returned to the truck and tried to start it before remembering to reset the gravity switch, then switched it on and started the truck normally. I don't know if this has anything at all to do with my trouble codes.
I installed a new fuel pump assembly a few months ago, supposedly OEM from NAPA Auto Parts. And I installed a new fuel filter and fuel relay about 1k miles before that.
At the moment I suspect the fuel pump, even though it's almost new, or maybe something else in the fuel path? When I turn on the fuel pump I hear the normal "zzz" of the motor but the pitch starts high then goes low and stays low, exactly like the sound made when starting from zero pressure due to a bad fuel check valve. Along with the "zzz" I hear a "shhh" in the tank as if air or foam is being pumped. I don't think I've ever heard the "shh" before. After I turn off the fuel pump the "shhh" continues, fading out over about three seconds. The tank is completely full. I don't smell fuel anywhere.
I don't have a fuel pressure gauge but would like to get one. What's the best way to install one? I don't mind if it's just under the hood or even temporary. My previous ranger had a pneumatic valve on the fuel rail but this truck doesn't.
Am I jumping too quickly to blame the fuel pump?
Maybe the gravity switch? I tried tripping it and resetting it and tapping on it -- no help.