Threw some simple codes..Suggestions?

d98gt said:

Well the CEL kicked on 2 days ago and I finally got around to getting it ran today.

2 codes

P0174 - Bank 2 too lean
P0171 - Bank 1 too lean

This happened out of no where What are some free things to try to fix this? I let my mother use the car to goto the store and she brought it back with a CEL on

Suggestions welcome :SNSign:

Click to expand...

i have the opposite codes both too rich and i cant figure nothin out.

You guys are BOTH lucky. Sometimes my car throws a bank 1/2 running RICH code, other times it throws a bank 1/2 running LEAN code. I don't know what is behind it, im figuring the CAI but don't really care that much since we have a reader and I can just clear the codes.

Mine threw a lean code about a week ago, I thought my issue was that very same line. Mine is also old and brittle, but I cleaned it out along with the TB and plenum and it eventually went away after a few starts/drives. Then it came back for about a day, and went away. That was 2 days ago or so, lets hope its fixed itself.

Cept mine was just bank 2, sensor 1.

subscribing

This helpful info was provided by FordTech from WestsideMustangs.com:

[quote author=FordTech link=topic=65641.msg474784#msg474784 date=1153181555]
I will try to help when I can...I am very busy so dont get mad if I cant answer all your questions/post.That post on the stang net forums is the vacuum source to the Purge Flow/Canister purge sensors.If that hose was off...you should get a rough/rolling idle from an obvious vacuum leak.You say it has a K&N filter.Usually the oil from that filter traps fuzz/grit on the MAF sensor element.The only way to tell is be very careful and remove the sensor off the housing.Inspect it for any type of fuzz,bugs or hair.The proper way to diag the P0171/P0174 is to look at long/short term fuel trims.If the short term fuel trim is too high at idle.....10 to 30% the problem is occuring at that time.
Without test equpitment hooked to it...you can only do visuals.Look for any loose hoses.The PCV lines....the crankcase hose and all the vacuum lines off the main vacuum tree.If no visuals reveal anything you will have to have it hooked to test equpitment that can monitor those circuts.
Things that can cause the P0171/P0174:
MAF sensor contamination...IE bugs...fuzz...hair.Also the screen if it has been change to aftermarket MAF sensor seals the MAF to aircleaner.
Low Fuel pressure
Vacuum leaks
PCV system...including the valve.
EGO sensors themselves on rare occasions
[/quote]

that vac line would easily cause that problem.. In fact it must have ran HORRIBLE.