Checked it with my XCAl2. Looked it up and it says may be running rich on bank 2.

So I clear the code and check a few hoses under the hood. I checked around the exhaust manifold and around the o2 sensor.. Nothing abnormal.

With nothing better to do, I took off driving to see if the code came back.. 20 mins of driving... cruizing, stop-n-go, and a couiple backroad WOT runs.. no code.

Any ideas? Maybe dirt on the MAF?

The truck runs fine.. no rough idle.. no nothing abnormal. When I noticed the code.. I was just cruisin around town.

Thanks,
Khendrix

EDIT: I have an air intake.. full exhaust - headers and a custom tune. 40k miles

 

Mine did this when the bolt that holds the pipe to the bracker worked it's way out and leaving that 1/4 hole for "more" air to enter the 3.5" pipe.

 

Hmm.. wouldn't that still be metered air?

I'll double check everyting under the hood here soon.

 

How old are your upstream O2 sensors??

enb

 

40k miles.

 

Call your custom tuner. Aside from the obvious potential problems, It may be a problem with the tune.

 

I have been running the same tune for over a year now though...

When I first saw the light, I thought it might be running lean because it was so cold outside... rich instead.

The light is still off, so we'll see. I'm gonna look on here for the *correct* was to clean the maf sensor. There is a lot of "correct" ways to clean it on the forum. lol

 

Light came back on. Any ideas?

I'm pretty sure it's not the tune because havent had a problem with it in over a year.

How do you properly clean the MAF?

 

PM Quintin.

 

carb and choke cleaner

 

Hi khendrix,

Well, usually a dirty MAF causes a lean condition, not a rich condition - anyway, the way to clean the MAF is to use a product called CRC's MAF Cleaner - you can get this as just about any auto parts store.

Disconnect the battery and remove the MAF meter (on the pre-2004 F-150's) or remove the MAF sensor from the air intake tract (in the 2004 & up F-150's) and then simply spray some CRC MAF Cleaner onto the thin wires inside the MAF electronics - make sure that you do not actually contact the thin wires with the spray nozzle from the can, just spray the cleaner onto the thin wires - let it sit for about 10-20 minutes to make sure it is dry, and then simply reinstall the MAF meter or MAF sensor - and that's it.

Just make sure of all the obvious - touch metal before touching the MAF so as to discharge any static electricity from your body, don't have the keys in the ignition when connecting or disconnecting the battery, etc.

Good luck!

 

Did everything mentioned above. Now I'm just logging some miles to see if it comes back on. And I'll go from there.

Thanks,
Khendrix

 

Mike,

Would a dirty MAF cause a 'significant' drop in MPG? I know we're all burning 'winter gas' here which contains a significantly greater percentage of butanol (or other hotter burning additive) but, I've dropped around 5 MPG over the last couple of months. This is on the *same* tune through out that time frame.

Ya know, just for giggles, I'm going to go clean that now... I know it can't hurt anything and I know it wasn't that long ago when I cleaned and reoiled the stack on the AF1... It can't hurt anything...

-RP-

 

Hi Rockpick,

A dirty MAF *can* contribute to lower mpg, but not what I would call "significant" - now if the MAF goes *bad*, then yes, the drop in mpg can be significant in a few cases, but usually when a MAF goes bad, the motor runs lean.

Overall, right now it's really just the extra-cold weather combined with normal lower-energy winter fuel that has everyone's fuel mileage AND their power down - we're seeing this on vehicles we dyno'd previously and then just recently dyno'd again quite a bit.

We recently dropped Anita's truck from it's typical winter average of 16.2 MPG all the way down to 14.5 MPG, just because it went from the 40's & 50's to zero degree weather - we were already on winterized fuel - so that will give you some idea of just how much difference the colder weather that almost everyone has been having here lately will do to fuel economy - ouch!

If you like, we'll clean your MAF for you when you come in for Dyno Day on Friday.

 

Cleaned the MAF.. code has NOT returned.

Also.. it seemed like the MAF was not tightened down all the way... not loose, but not real tight. Possibly air was getting around it... but that wouldn't cause a rich condition would it?

Anyways, all is well for now... I hape I havent spoke too soon.

Thanks