Causes for a P0174 Code?

[burtonbrd138]

I have a 2000 Xls and my CEL has came on once every two days or once every day. I just recently put an cold air intake in my truck and since then i have been getting this P0174 Bank 2 System Too Leancode. The intake is on the stock hose that goes to the throttle body. I dont know what to do to fix this problem. I checked the vacuum lines and they are all connected, and i put fuel injector cleaner in my gas tank to see if that helps. And i cleaned my MAF sensor(TWICE)! I AM JUST STUMPED!

-Am i getting this code because of the intake?
-Is a new fuel filter needed?
-if someone can direct me to a HOW TO THRead would be good

-My Intake-

 

[burtonbrd138]

Could it be the O2 sensor or the EGR sensor?

 

[gavin]

-Am i getting this code because of the intake?
-Is a new fuel filter needed?

no and no.

but... I can say I'm not sure what would cause a single cylinder to run lean.

any other mods, or just the replacement filter?

doubtful an O2 sensor, or you'd be getting a code for an O2.

has it been running funny? hearing any pinging?

you may also just try resetting the computer (disconnect neg. battery cable for ~10-15 min), and see if it comes back.

 

[burtonbrd138]

ya i disconected the battery. I have done that every time the code comes on. No other mods to this vehicle except for the spark plugs i put in a month before this has happened. Not really running funny maybe just a little pinging when its cold and a bit of a rough idle.

 

[burtonbrd138]

bump

 

[burtonbrd138]

Checked vacuum lines, nothing found. I am starting to think the problem is in the PCV area. Am i going in the right direction? Cause honestly i have no clue

 

[burtonbrd138]

bumpity bump

 

[mrwhipper]

I had a bank 1 lean before. I had to change the O ring gaskets on the intake. It only happened to me on very cold mornings

 

[burtonbrd138]

where on the intake? Pictures would help

 

[mrwhipper]

I am sorry I will not be able to get you pics quickly. The Explorer is not here and wont be back for a few days. What I can tell you is that there are two sets of them because the intake is two pieces. The easy way to check is to get a can of parts cleaner or equivelint and spray around where the intake meets up with the engine. If the RPMs increase then you have a leak. If not, well we will have to keep thinking of other things that may be causing that code.

 

[burtonbrd138]

oh so you are saying to check around the throttle body area?

 

[mrwhipper]

Yes, yes. Sorry for any confusion. It is a very common problem.

 

[burtonbrd138]

how much is this O ring gasket?

 

[CAHUNTERMAN]

I also would suspect the intake gaskets. On my 99 4.0 I got the same code about two years ago and traced it to the lower intake gasket. It's now starting to idle rough again at cold start so I suspect it's time to replace them again although I'm now loosing water also so this time it might be more serious.

 

[burtonbrd138]

when you say you are loosing water do you mean radiator coolant?

 

[mrwhipper]

how much is this O ring gasket?

I think the upper kit and the lower kit was like 70.00 It is not an O ring. It Man it was a while ago. 6 O rings and 2 gaskets I believe. I could be wrong. It in not hard but it will be time consuming. You can get the kit from your local Ford dealer. I wouldn't get too excited until you test it first.

 

[CAHUNTERMAN]

when you say you are loosing water do you mean radiator coolant?

Yes, and there's no leak so I'm afraid it's internal.

 

[burtonbrd138]

ok i do think i have an air leak no that i think about it. When i put the intake on i had to buy an adapter for the cone filter to sit on. The adapter did not sit spot on and has a little gap where it may have air going through it. The adapter is the silver part in the first pic. Could this be the cause of the problem? I think it is and i will post pics tomorrow.
-Tell me your opinion on this.

 

[CAHUNTERMAN]

ok i do think i have an air leak no that i think about it. When i put the intake on i had to buy an adapter for the cone filter to sit on. The adapter did not sit spot on and has a little gap where it may have air going through it. The adapter is the silver part in the first pic. Could this be the cause of the problem? I think it is and i will post pics tomorrow.
-Tell me your opinion on this.

As long as the leak is before the MAF I really don't think it would cause any problem.

 

[burtonbrd138]

Well i have gotten this code EVERY DAY since i put the intake on so i was just throwing this idea out there. I will put the stock filter on tomorrow just to test it and take pics of the gap between the adapter and MAF.
-Keep an eye on this thread so you can tell me what you think tomorrow