Kifels: I didn't even read your post. To use your words, you are sadly mistaken if you think I was telling you anything at all.

The OP has a motor that has been known to have lean issues, especially when modified by an aftermarket intake.

There are hundreds of 'professional' tuners out there that claim they understand the 5.4L engines.

There are also hundreds of PCM configurations of stock trucks.

I don't know or care who your tuner is; I will rely on one of these three:

http://www.vmptuning.com/store/index.php?

http://www.troyerperformance.com/cgi-bin/ppistore.pl

http://dygytalworld.ehost-services139.com/php/Index.html

 

going to make an effort to get this thread backon track.

it doesn't matter who is wrong or right.

seing how you have not yet had any lean issue try cleaning you MAF, start there. it's up to you what to do next. weather you try to put the stock intake back on, replace the MAF, or change the spark plugs.

as far as a tune goes, I would highly reccomend one at some point down the road, it is one of those can hurt might help deals. I am not saying to go run out and dump a buch of money into a tuner. but like I said do it the economic way and do your mods. that my opinion.

I am not making any further posts.

 

Oh, I forgot something that may be worth mentioning. Another reason why I brought up the possibility of getting a cylinder bank lean code is that if your oxygen sensors are the original sensors and you have put a lot of miles of them, they may be beginning to fail and are not as sensitive as when new, but not to the extent that they trigger your MIL. It happens. Also, I'm not sure of this but I believe the ODBII system that monitors the oxygen sensors takes a lot longer to complete than any other monitor on the vehicle. So maybe if this vehicle was driven more it may eventually come up with that code? Although scanning tools should be able to tell if the oxygen sensor monitor has been completed or not. But maybe the person who scanned the PCM didn't look to see if that monitor had finished. Just an idea.
I hope all of this that we are saying helps pin point the problem.

 

One more for the OP:

http://www.f150online.com/forums/chi...ml#post4071802

 

Thank you all for your input and advice. I did not disconnect the neg battery cable after installation. The truck does have 80,000 miles on it and I was thinking that would have a lot to do with it. I plan on changing out the plugs and wires soon due to high millage. It seems as though everyone has the same idea as I did, the MAFS. I am going to take it out and clean it and see if that helps. Is there any tips I should know when cleaning the MAFS? If this does not work, how much does a tune cost?

 

You really need to read those threads I posted. If you have a 5.4L, I would seriously consider getting a tuner and custom tune BEFORE installing the intake modification.

Actually, I would save my money and do the Gotts mod - but that's a whole another discussion...

 

start off by cleaning the throttle body and the manifold if this dosent work then clean the maf

 

One more for the OP (and anyone else that thinks CAIs have a good $/hp gain ratio):

http://www.f150online.com/forums/chi...ml#post4072045

 

You've got to watch out for some of the K&N filters - I honestly hate to say that (as someone who uses K&N religiously) But with most of the new CAI's the problem is that they are lined/coated with a oil/film that helps them filter the air better. The problem is that sometimes the coating gets draw into the intake manifold (adversely affecting the Mass Air Flow Sensor) In addition though, this can mess up O2 sensors and other electronics associated with the Air/Intake systems

The best thing you can do is clean the the intake as best as you can - and talk to someone who knows more than me about the new product that cleans mass air flow sensors (put on latex gloves to do it and don't loose anything into the intake manifold). Also pull your filter off and clean it thoroughly with a dry rag inside and out.

good luck man

 

you may want to take a look at this.

http://www.knfilters.com/MAF/massairfindings.htm

http://www.knfilters.com/faq.htm#27

http://www.knfilters.com/MAF/massairpledge.htm