Mustang Evolution Forum banner

1 - 20 of 38 Posts

·
Registered
Joined
·
18 Posts
Discussion Starter #1
I have a 2006 V6 auto w/ ~70,000 miles and I recently installed a Stack Racing CAI about 2 months ago. A week after the install my CEL came on and the DTC code came back as P0171. After several code clears and an ECM reset, the code keeps popping up. I've recently done a few things to try to find a cure:

Smoke test to try to find a leak in the intake gasket, vacuum hoses, and exhaust- no leaks found
Cleaned and eventually replaced my MAF due to a separate but resolved problem ( DTC P0113)

However the CEL continues to pop back up about 50 miles or so after each code clear. The freeze frame form the most recent code read (about 4 hours ago) reads:

Trouble Code: P0171
Fuel System 1: CL, using H02S
Fuel System 2: N/A
Calculated Load: 64.3%
Coolant Temp: 185 F
Short Term Fuel Trim 1: 5.4%
Long Term Fuel Trim 1: 24.9%
Short Term Fuel Trim 2: 2.3 %
Long Term Fuel Trim 2: 24.9%
MAP (in. Hg): 21.5
Engine RPM: 1857
Vehicle Speed: 32 MPH
Ignition Advance: 31.5 Degrees
Intake Air Temp: 54 F
Mass Air Flow: 3.765 lb/min
Absolute Throttle Position: 23.1%
O2S11: 0.415 v and 10.1%
O2S12: 0.730 v and N/A %
O2S21: 0.840 v and 3.1%
O2S22: 0.810 v and N/A%

I/M Status

MIL Status: on
Misfire Monitor: ok
Fuel System Monitor: ok
Comp. Component: ok
Catalyst Monitor: ok
Htd Catalyst: n/a
Evap System Monitor: inc
Sec Air System: n/a
A/C Refridg Monitor: n/a
O2 Sensor Monitor: ok
O2 Sensor Heater: ok
EGR System: ok

I'm only 17 and this is the first time I've ever had to deal with problems like these so any info y'all can give will really help! Let me know what y'all think! Thanks!
 

·
Registered
Joined
·
153 Posts
I don't know if it will work on a 2006, but as far as I know there is a self analysis test that you can preform on your speedo for 99-2004's. Put your key in the ignition ,turn key one time, then push your trip button in and hold it down while at the same time turning your key for a second time.. After five seconds the words "Gage" will appear. Once all your gates sweep right than back left you can let go of your trip and start your car.. It'll show problem codes if you have any(which you can look up in your user manual to see what's wrong). This self analysis will also show you other cool things like fuel level, battery level, rpm's and mph while you're driving. Hope that helps. Sorry if it gets kind of confusing. It's easier to do than it sounds
 

·
Premium Member
Joined
·
1,269 Posts
That code is telling you:

Diagnostic Trouble Codes P0171 (System too Lean Bank 1)

Looks like this is in the stuff you captured:
Short Term Fuel Trim 1: 5.4%
Long Term Fuel Trim 1: 24.9%
Short Term Fuel Trim 2: 2.3 %
Long Term Fuel Trim 2: 24.9%
Short term is different for bank 1.

Did you retune for the CAI? Sounds like that is causing your lean code. Especially given the timing of putting the CAI on the car and the resulting CEL and code.
 

·
Lorraine's driver
Joined
·
8,196 Posts
Make sure you don't have any leaks in your CAI setup that are bypassing the MAF. Check your MAF connection too.
 

·
Registered
Joined
·
18 Posts
Discussion Starter #6
I've checked the CAI connections and MAF several times over and I haven't found any leaks or spaces. As for the retune, American Muscle (where I got the CAI from) said a tune was not required for this particular CAI. But if it was an issue with the intake, wouldn't affect both sides of my engine and not just bank 1?
 

·
Lorraine's driver
Joined
·
8,196 Posts
I've checked the CAI connections and MAF several times over and I haven't found any leaks or spaces. As for the retune, American Muscle (where I got the CAI from) said a tune was not required for this particular CAI. But if it was an issue with the intake, wouldn't affect both sides of my engine and not just bank 1?
AM is correct, no tune is required for nearly all CAI setups. An easy way to determine if its the tune is to flash back to the stock tune. Anytime you flash a new tune, you should perform the idle re-learn. It allows the ECU time to adjust the idle and fuel trim.

Idle Re-Learn

Disconnect NEG from battery for 5min

Reconnect and start car, let idle until engine gets to operating temp. Let idle a little over a minute

Turn on A/C to MAX, let idle little over a minute, turn off A/C

Then drive the car for at least 10 miles
 

·
Registered
Joined
·
18 Posts
Discussion Starter #8
I'll give the ECM reset and idle relearn another shot. I haven't done any tuning so the ECM still has the stock tune. I'll go by Autozone as well to get some fuel injector cleaner as well to see if that will make a difference.
 

·
Registered
Joined
·
18 Posts
Discussion Starter #9
Here's an update on what I've done:

My grand dad and I flipped the O2 sensors before the cats in order to rule out them causing the p0171 code. We did a code clear and ECM reset afterwards but the code came back. So now the only thing I can think of now are the fuel injectors. I've been thinking about a Seafoam treatment to see what it would do for them. What do y'all think?
 

·
Lorraine's driver
Joined
·
8,196 Posts
Here's an update on what I've done:

My grand dad and I flipped the O2 sensors before the cats in order to rule out them causing the p0171 code. We did a code clear and ECM reset afterwards but the code came back. So now the only thing I can think of now are the fuel injectors. I've been thinking about a Seafoam treatment to see what it would do for them. What do y'all think?
Flipped the O2 sensors...does that mean you swapped them out with the others to see if they were bad?

Checkout this website and see if there is any other testing you can try before you buy and new injectors, etc.
Troubleshooting p0171 and p0174 codes

I'm looking for a link that was posted on how to test injectors. I'll post that when I find it.

If you do Seafoam, make sure you do it as the instructions on their website suggest. The only Seafoaming I've done is to dump it in the gas tank. Anybody else have some Seafoam suggestions?
 

·
Registered
Joined
·
18 Posts
Discussion Starter #12
We just moved the O2 sensor from bank 1 to bank 2 and vice versa. We were hoping when the light came back on that the code would come up on bank 2 but it didn't. I think I'm gonna do a Seafoam treatment this weekend when I have the time to do it
 

·
Lorraine's driver
Joined
·
8,196 Posts
We just moved the O2 sensor from bank 1 to bank 2 and vice versa. We were hoping when the light came back on that the code would come up on bank 2 but it didn't. I think I'm gonna do a Seafoam treatment this weekend when I have the time to do it
Cool, let us know how it goes. :good:
 

·
Registered
Joined
·
1,563 Posts
Did you recently oil your CAI filter? Or over oiled it from when you installed it? Before you waste a bunch of time and monies on other stuff see if you can get a new filter and install it. I know the ones for my car I can pick up at Oriely for $20. The same thing happened to my stang about 6 months ago. I had over oiled the filter. No matter how much I cleaned it I still got the codes. I put a new filter on and no more codes. Also, don't forget to clean your MAF sensor.
 

·
Registered
Joined
·
18 Posts
Discussion Starter #15
I just got home from school and popped the hood to take a peek. When I did I heard a hissing sound coming from the left side of the engine that's throwing the codes. Is that normal? Or should there be any hissing what so ever to release heat or something like that?
 

·
Lorraine's driver
Joined
·
8,196 Posts
I just got home from school and popped the hood to take a peek. When I did I heard a hissing sound coming from the left side of the engine that's throwing the codes. Is that normal? Or should there be any hissing what so ever to release heat or something like that?
That could be a vacuum leak.
 

·
Registered
Joined
·
18 Posts
Discussion Starter #17
But wouldn't the smoke test show that leak? When we did it, there wasn't any noticeable smoke coming from the engine bay
 

·
Lorraine's driver
Joined
·
8,196 Posts
But wouldn't the smoke test show that leak? When we did it, there wasn't any noticeable smoke coming from the engine bay
If its a smoke test where you hold it around the engine, I would think so.

If it was a manifold leak in you exhaust, I don't think it would throw a code, so I don't think could explain the noise. Is it loud enough to determine what side of the engine it's on?

Also, you may want to double-check your intake for leaks. Piping, around the MAF, maybe close to the throttle body. That could give the sound you hear, if it was big enough of a leak.
 

·
Registered
Joined
·
18 Posts
Discussion Starter #19
Never mind about the hissing sound now. I found out that was my A/C pressurizing lol. I realized that I was running the air conditioning full blast since it gets pretty hot down here in South Carolina and I ran it today with the windows down and no A/C. No hissing when I popped the hood! No change with the engine light though
 

·
Lorraine's driver
Joined
·
8,196 Posts
Never mind about the hissing sound now. I found out that was my A/C pressurizing lol. I realized that I was running the air conditioning full blast since it gets pretty hot down here in South Carolina and I ran it today with the windows down and no A/C. No hissing when I popped the hood! No change with the engine light though
That's good, Lol. At least there's not another prob going on. :good:

For your CEL code, take a look at this website and see if there is some info here that will help.
Ford Lean Codes/URL]
 
1 - 20 of 38 Posts
Top