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Old 11-12-2012
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Check engine light after getting gas

Hey guys. I've had a Check engine light pop after i've been getting gas lately.
The codes are P0171 and P0174 which is O2 bank 1 and 2 running to lean. The trouble shooter in my scanner said something about a dirty fuel filter (which is 6 months old), some dirty injectors or something along the lines of bad gas.

So i tossed some seafoam into my tank to see if maybe it just needed some of that to clean up the injectors and what not. but has anyone else had these codes pop up before? how did you fix them?
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Old 11-12-2012
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Do you shut off your engine while filling the tank ?

Opening the Gas Cap while the key is in the run position will do it also.
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Old 11-12-2012
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Always shut off the truck. I usually go inside to pay.
Its nothing Gas Cap related. that i'm pretty sure of.
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Old 11-12-2012
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take your gas cap off and put it back on, drive the truck for a day. it will go away
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Old 11-12-2012
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Quote:
Originally Posted by 06RangerXLT View Post
take your gas cap off and put it back on, drive the truck for a day. it will go away
Tried that.
I get Gas several times a week. I can shut it off and it will come one again at what seems like a random time when i get gas.

The only time i can get it to shut off is if i do it with my scanner.
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Old 11-15-2012
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On my 08 Ranger I've had that little "gas cap" icon randomly pop up now and then. When I scan for codes, no codes show up, so I disconnect the battery for about 15 min's, and it goes out.
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Old 11-18-2012
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My update:
I threw a new fuel filter in it (the other one didn't look to bad) and it hasn't come back on again.
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Old 11-19-2012
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Sounds like the canister vent solenoid is stuck open. When it goes into evap venting and the vapor management valve opens, it is sucking fresh air in...inducing the lean codes. Or it could be something unrelated like a dirty MAF, low fuel pressure, intake gasket leak, or the fuel filter you replaced.
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Old 11-19-2012
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Quote:
Originally Posted by Toreador4x4 View Post
Sounds like the canister vent solenoid is stuck open. When it goes into evap venting and the vapor management valve opens, it is sucking fresh air in...inducing the lean codes. Or it could be something unrelated like a dirty MAF, low fuel pressure, intake gasket leak, or the fuel filter you replaced.
I've been getting **** gas milage too. should i check some of those things?
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Old 11-19-2012
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sounds like you need a system flush
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Old 11-19-2012
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I put some of the Lucas oil fuel injector in my tank last fill up.
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Old 11-19-2012
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A "system flush" will do nothing if you have lean codes. Spray carb clean on vacuum lines and intake mating surfaces while it idles to see if the idle changes. If it does, you have a leak in that spot. If no leaks can be found, clean the MAF, check the air filter and disconnect the battery for 30 minutes. Your gas mileage will drop due to the winter additves so keep that in mind
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Old 11-20-2012
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Quote:
Originally Posted by Toreador4x4 View Post
A "system flush" will do nothing if you have lean codes. Spray carb clean on vacuum lines and intake mating surfaces while it idles to see if the idle changes. If it does, you have a leak in that spot. If no leaks can be found, clean the MAF, check the air filter and disconnect the battery for 30 minutes. Your gas mileage will drop due to the winter additves so keep that in mind
The old man mentioned something about the Winter Mix, so i guess i should quit stressing over MPG's.

I know it doesn't need a flush, I just add the lucas oil every 6-8 months regularly anyways, for some reason i believe its good for your engine.

I'll check vacuum lines and clean the MAF this weekend. It got a new Air filter about 6 months ago.
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Old 11-20-2012
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IMO it's too early for winter mix....
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Old 11-21-2012
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IMO it's too early for winter mix....
Its gonna be 60 (or 15.5 for you) out today. I might even wash my truck.
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Old 11-21-2012
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they usually start winter mix around here in the beginning of november...thats when i notice the gas mileage plunge
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Old 11-23-2012
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Didn't buy BP bad gas at any time did you?
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Old 11-24-2012
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Didn't buy BP bad gas at any time did you?
I fill up Sunoco everytime. The one by me charges cash price with a debit card without having to go in the store.

Plus, they're usually cheapish.
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Old 01-09-2013
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I'm gonna bump this because its doing it again.

So far here's what i've checked.
Fuel Pressure regulator on the rail
Fuel Lines
Fuel Filter.
Vent tube.
Looked for an Exhaust hole.
EVAP canister.

I've looked at every tooltip in the Snap-On trouble shooter. the only thing i have left to do is replace the damn fuel pump.
Troubleshooter also says to check for PCV leaks or Vacuum leaks, but there is no change in idle, leading me to believe if there is a broken hose its not affecting it.

Nobody else had these codes before?
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Old 01-15-2013
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what is the fuel pressure at idle and driving at WOT?
what are the fuel trims and the MAF-V at idle and at WOT 4500+ RPM?
have you sprayed the throttle body, intake gaskets, vacuum lines and pcv valve area with carb clean to see if the idle changes?
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Old 01-15-2013
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Mine does this as well. I still think it has to do with the evap cannister, but can't find a leak. I periodically reset the light with a OBD-II scanner, but it always comes back at somepoint. Sometimes if I ignore the light for a few days it will turn itself off for a while.
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Old 01-15-2013
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Quote:
Originally Posted by Toreador4x4 View Post
what is the fuel pressure at idle and driving at WOT?
what are the fuel trims and the MAF-V at idle and at WOT 4500+ RPM?
have you sprayed the throttle body, intake gaskets, vacuum lines and pcv valve area with carb clean to see if the idle changes?
I'll check them this weekend.

I've not sprayed the throttle body, but i did do all the Vacuum lines i could see and the PCV valve.

Do you know what Fuel pressure is supposed to be at KOEO? I checked it a while ago but i didn't know what it was supposed to be exactly. It seems to bleed off ~5-8 pounds if you leave the key on for a second. which was leading me to believe that the fuel pump has maybe a tear in the inner line that brings gas up.
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Old 02-24-2013
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I had that code late this fall, turned out to be the intake gaskets being bad, had my mechanic friend change them as well the valve cover gaskets since the intake would be off and they were leaking as well. Right now I am waiting for 3 new o2 sensors since ine of the is dying and I feel that it is better to replace all just like spark plugs. When my CEL light popped on for the original problem, the truck was running fine yet but the mileage was dropping off.
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Old 02-24-2013
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The Fuel damper was bad, which is why i was getting the light. After i messed around with that and cleaned out the fuel rail and injectors. I've yet to see a light.
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