My truck: 2007 Supercrew XLT V8 5.4L 4x4 (K&N CAI to replace stock CAI)
Mileage: 190500 km

Background: when accelerating on the highway, to over 100km/h, it feels like it stutters/hiccups when I stomp on the gas. If I accelerate slowly, it will go. Lately, the truck has felt like it is losing horsepower in the city, too.

After a little bit of research, I thought it might be my O2 sensors. I replaced all 4 of them, and I still had issues.

After a little bit more research, I thought it might be my catalytic converters. Looking around a prices (everything from the weld-in type to the complete-with-pipes type), I realized I wasn't going to be able to afford to replace all 4 (I was told there was four, but things I've researched say there's only 2), as I prefer to replace everything necessary in an isolated system at once (keeps things "balanced", IMHO)

Talking with my mechanic neighbours (one's a Ford mechanic, the other a Toyota mechanic [these are the guys that told me there was 4 cats on my truck]), they suggested cleaning the MAF sensor. I went out today and picked up some Mass Air Flow Sensor cleaner, took the sensor off and cleaned it using this tutorial (sprayed it 4 times), replaced the sensor and took it for a test. This didn't seem to help.

I have an Bluetooth OBDII reader I picked up off Ebay for $30, and just ran a test/diagnostics of my truck using the TORQUE app for my android phone. These are the "Not OK" results from my testing:

Vehicle Mode $06 Test Results
MID: $30 TID: $eb
Min: -102.24% Max: 246.03%
Current: 327.52%

MID: $80 TID: $eb
Min: -266.08% Max: 246.03%
Current: 327.52%

MID: $d0 TID: $0e
Min: 0 Max: 0
Current: 48, 000

This is all the information that appears in the test results. I have no idea what these mean. I am so lost right now it's not even funny.

Does anyone else use the TORQUE app? Can anyone help me make sense of these "not ok" messages? Can someone PLEASE help me continue to diagnose this stuttering/hiccuping issue?!? The only think I can think of now that might be the issue is that something in the fuel system itself (fuel pump, fuel delivery module) needs replacing.

As always, thank you in advance for any and all helpful information you can supply.

 

You have a CAI on a stock 3 valve with no custom tuning to compensate, correct? If that is right, put the stock intake back on and start from there.

 

Have you changed your plugs recently.... Or ever?

 

I was having this problem before it was changed from stock to K&N (was done at the same time as my O2 sensors...about 2 months ago).

*I* have never had the plugs changed, but I was lead to believe (from the dealership I bought it from) that when the engine was changed out on warranty (prior owner had it changed when he tried to change the plugs and snapped 2 off...so I was told) the plugs were changed then, too. When I bought it Summer 2010, the engine had 8300 miles on it.

 

Is a custom tune necessary, or would simply disconnecting and reconnecting the battery be enough?

 

I have an 07 with 191000 km on it. I'm quite sure the lean issue was sorted out for our model year.
How did your motor get changed out under warranty? You said you have 190,000k on it and only bought it a year ago.... 3 yrs/60k was the warranty for these trucks. Is it possible you have a previously enjoyed "new motor" in your truck?
At any rate, it sounds like you have a misfire. I'll bet it's plugs or coils.

 

This truck was an oilfield truck lease-back. I bought it from a very reputable dealership in Calgary, and have all the paperwork on the truck. I'm not sure on the details of how or why the engine was replaced, but the dealer and the paperwork (and the Carfax) all jive with it being replaced. Because the mileage was high when I bought it, and with the conditions of the financing, they wouldn't let me have (or extend) the warranty. I called Ford Canada directly a couple of days ago, and they confirmed this.

Plugs, coils, and wires are probably the next cheapest thing to try I guess. It's times like this when I wish I understood auto mechanics as much as I do computer programming.

 

Disconnecting the battery only resets the ECU, this isn't able to account for a change to the MAF. Slot style MAF's like ours are especially picky. This thread explains a little more:
https://www.f150forum.com/f7/edge-mods-93740/
It sounds like a misfire type of condition is what you're chasing. Now the cause is the issue. I'm betting they reused the COPs from the old motor on the reman one. I'd start by checking the COPs. Then if they reused the exhaust system cats may need tested.

It wasn't really ever "sorted out" because aftermarket intakes were never factored into the Ford tuning. Yes the 06+ run better a/f ratios than the 04-05, but that's only because the early ones were near lean from the factory. Changing the MAF still produces the same result. I do agree with you though it sounds like a misfire.

 

Hey man... I use torque and have almost the same exact results when running the test... but I think my truck is running fine... I haven't noticed any problems other than the test results... my results were:
MID:$60 TID:$eb
Min: -102.24% MAX: 246.05%
Current: 327.52%

MID: $c0 TID: $0e
Min: 0. Max: 0.
Current 48,000

I let the test run longer (it stopped then started going again) and it also showed 3 others...

MID:$70 TID:$0e
Min: 0. Max; 0.
Current: 48,000

MID: $70 TID: $eb
Min: -266.08% Max: 246.05%
Current: 327.52%

MID: 90$ TID: $20
Min:51,247. Max: 57,344
Current: 65,523

If anyone has any idea what this means that would be great...

 

Bumping this thread..

I was having choppy/rough engine problems (2007 F150 5.4 138k miles). Coils are 1yr old. Plugs 35,000 miles old. Replaced plugs since they showed excessive wear and the gap was considerably off. Fuel Filter replaced as well since it saw 35,000 miles. Running much better but not perfect. Still got these similar Torque results:


MID:$30 TID:$eb
Max: -81.62% Min: 225.44%
Test Result Value: -0.16%
FAIL
------------
(3) EVAP Monitor (cap off) tests incomplete or dependent test failed
------------
MID:$70 TID:$48
Max: 57,344 Min: 51,247
Test result value: 65,523
FAIL

Has anyone been able to decode these results yet?