need help solving lean condition

[Justin]

I had the mad unplugged for about 1 minute then varied the rpm for another minute. engine temp was 192 and was in open loop when I did the test

To really get an idea of what is going on, you would want to drive it around for 3-4 minutes to see where the trims start to trend.

It's difficult to know what could be going on with the vehicle in park/neutral due to how little load is being applied to the engine.

 

[sonic_the_hedgeh]

i'm trying to get to the bottom of my super bad mpg (150-180 a tank) and p0171 and p0174 codes. at first i took it to a shop to be looked at and i was told i had 3 bad injectors and they wanted to charge me around $750 for 8 injectors and labor. but after changing my evap purge valve my check engine light went away and i figured they was trying to **** me over. i ended up buying an al619 scan tool to figure out why my abs light was on and noticed my LTFTs were super high between 18% and 25%. after some reading online i came to the conclusion that i have a fuel delivery problem. but something i did notice is that my LTFTs are less than 10% when cold and rise has the car gets closer to operating temps. i have not checked my plugs yet and what should i check before i start dumping money into it

I had error codes indicating both my banks were running lean. I did notice as well a lack of power all the time as well as poor fuel economy.

So I researched then bought a can of Royal Purple fuel system cleaner. It took 2 days of burning fuel then my check engine light went off.
I have had problems with the MAF as well but after cleaning it seems fine.

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[HACK BLOCK]

I've tried fuel system cleaner and nothing

 

[sonic_the_hedgeh]

I had error codes indicating both my banks were running lean. I did notice as well a lack of power all the time as well as poor fuel economy.

So I researched then bought a can of Royal Purple fuel system cleaner. It took 2 days of burning fuel then my check engine light went off.
I have had problems with the MAF as well but after cleaning it seems fine.

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Yes I have the same lean problem. Although I have used a few fuel cleaners only royal purple came close. The check engine light still comes on but not as often. After researching it online I am going to try a second royal purple in the fuel again. I cleaned the MAF which did help.

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[bottomline2000]

Yes I have the same lean problem. Although I have used a few fuel cleaners only royal purple came close. The check engine light still comes on but not as often. After researching it online I am going to try a second royal purple in the fuel again. I cleaned the MAF which did help.

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Fuel cleaners aren't going to fix things like leaking intake gaskets or bad 02 sensors. What codes re you getting? If it's both banks then look at what they share. I would start with the intake gasket or the engine sucking in unmetered air..

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[sonic_the_hedgeh]

To really get an idea of what is going on, you would want to drive it around for 3-4 minutes to see where the trims start to trend.

It's difficult to know what could be going on with the vehicle in park/neutral due to how little load is being applied to the engine.

In park or neutral runs fine. I never hear it running strange. Just one bank is showing as lean.


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[Chubbs]

Since fuel trims are on the menu, would anybody care to give me some clues as to what’s going on with my application?

 

[sonic_the_hedgeh]

i'm trying to get to the bottom of my super bad mpg (150-180 a tank) and p0171 and p0174 codes. at first i took it to a shop to be looked at and i was told i had 3 bad injectors and they wanted to charge me around $750 for 8 injectors and labor. but after changing my evap purge valve my check engine light went away and i figured they was trying to **** me over. i ended up buying an al619 scan tool to figure out why my abs light was on and noticed my LTFTs were super high between 18% and 25%. after some reading online i came to the conclusion that i have a fuel delivery problem. but something i did notice is that my LTFTs are less than 10% when cold and rise has the car gets closer to operating temps. i have not checked my plugs yet and what should i check before i start dumping money into it

My check engine light still comes on. Where is the purge valve to replace? I have to try that.

I figure only thing I have left is to take the vacuum line off the back of the engine and put some seafaom through it. Not sure if that will help.

I have 6.0 later and mine says lean on one bank. If I put any cleaner in the fuel the light will go off for days at a time.

I haven't had the chance to remove the vacuum line at the back of the engine but might just work as apparently it leads directly to the injectors

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