Lean codes
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Lean codes
Im getting Codes P0171, P0174 lean banks 1 and 2 and p2195 02 sensor excess lean and P2197 02 sensor stuck low signal on my 2004 F150 4X4 with the 5.4L with only 26,000 miles.
Things that I have done on my own to try to correct the problem. Changed fuel filter, cleaned MAF sensor, Crawled over the intake manifold section looking for any obvious vac leaks. So far nothing has helped.
Im trying to do everything on my own as much as possible to keep the truck out of the shop. I dont know anything about Fords but trying to use my common sense and my knowledge from working on my chevy powered hot rod. I am guessing either its not getting enough fuel or its getting too much air from a vac leak. Is there anything specific known to go wrong and cause this problem or anything I should be looking at better?
Things that I have done on my own to try to correct the problem. Changed fuel filter, cleaned MAF sensor, Crawled over the intake manifold section looking for any obvious vac leaks. So far nothing has helped.
Im trying to do everything on my own as much as possible to keep the truck out of the shop. I dont know anything about Fords but trying to use my common sense and my knowledge from working on my chevy powered hot rod. I am guessing either its not getting enough fuel or its getting too much air from a vac leak. Is there anything specific known to go wrong and cause this problem or anything I should be looking at better?
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I actually tried using carb cleaner. I was told by a ASE master tech in which I dont really have a lot of confidence in that the PCM makes adjustments to compensate for this and that this method will not work. He was telling me the only way to spot a vac leak in this situation other than physically seeing it and catching it that way is to use a smoke machine and look for the smoke leaking out. I dont know if he is right or wrong but like I said I used the old school carb cleaner method and came up empty handed. I have never used the propane method but will try anything if will keep me from spending $$$$ at a shop.
One other thing the idle is so up and down I dont know if my ears would be able to notice the difference. If I do find it using the propane method will the idle steady out as long as it is sucking in the gas?
One other thing the idle is so up and down I dont know if my ears would be able to notice the difference. If I do find it using the propane method will the idle steady out as long as it is sucking in the gas?
Fleet Mechanic
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From: Raleigh USA
Check the brake booster vac hose. It is on the driver's side at the back of the intake at the bottom. You should be able to see it by looking from under the truck just above the bellhousing. You can use carb cleaner but unless it's a very large leak the only way to tell if you found it is by watching the fuel trims on a scan tool.
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I have tried using propane and still nothing. I called a friend of mine that owns a repair shop he thinks it is the vacuum hose to the brake booster just from what I have told him. I looked for where the booster vac line connects to the back of the manifold and couldnt see it at all. I crawled under the truck and tried looking down from the top. I tried sticking my big hand between the firewall and intake but it wouldnt fit.
My schedule isnt working with me I want to have him diagnose the problem but cant seem to get in when I have the time and when I have the time his shop is overflowing with business. I personally have given up until atleast I get a real answer from someone that can physically look at it that can make an educated decision as to what the problem is. I still have my fingers crossed he tells me it is something easy that I can fix myself.
My schedule isnt working with me I want to have him diagnose the problem but cant seem to get in when I have the time and when I have the time his shop is overflowing with business. I personally have given up until atleast I get a real answer from someone that can physically look at it that can make an educated decision as to what the problem is. I still have my fingers crossed he tells me it is something easy that I can fix myself.
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I will definatly try that this morning before I take it in. I removed it to spray some throttle body cleaner on it in an attempt possibly clean it. The MAF sensor had a light greyish film on side that looks like metal. Now that I am thinking about it should it have anything on it at all since it is behind the air filter and in front of the throttle body? I never thought about unplugging it either since it is running so bad and seems to me that it might have gotten worse since I removed it and reinstalled it. I have had a lot of stressful things happen since all this started so I have been kind of scatter brained during this whole process.
Now that I am thinking about it I am starting to wonder if I accidently used a can of carb cleaner to clean the MAF rather than the can of throttle body cleaner I made a special trip to the store to get for this problem. I am so used to working on my old chevy hot rod project I might have grabbed the wrong can not thinking about what I was doing. If I did use carb cleaner rather than the throttle body cleaner could I have damaged the sensor. I dont know what the difference is between the 2 cleaners other than the lablels.
Now that I am thinking about it I am starting to wonder if I accidently used a can of carb cleaner to clean the MAF rather than the can of throttle body cleaner I made a special trip to the store to get for this problem. I am so used to working on my old chevy hot rod project I might have grabbed the wrong can not thinking about what I was doing. If I did use carb cleaner rather than the throttle body cleaner could I have damaged the sensor. I dont know what the difference is between the 2 cleaners other than the lablels.
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The carb cleaner has a higher concentrate of detergents and is much harsher and more aggressive than throttle body cleaner. The throttle body cleaner is formulated to clean a throttle boby without removing the coating that is in the bore from the factory.
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My problem is a pretty big vac leak. I used a smoke machine to find it since I could not find it using any other method. I am pretty sure it has something to do with the intake manifold runner control. Being the fact there isnt any room to see or stick my hand between the intake and fire wall where the smoke was leaking from I used a small mirror to look and still couldnt see much.
I cant seem to find any information on the IMRC. I have used several online ford parts websites for diagrams or part numbers etc and can not find anything about it for the trucks. I am going to have to pull the intake manifold I guess and see what is going and hope the local dealer can give me some info and sell me the right parts to get it fixed. I am not looking forward to doing this.
I cant seem to find any information on the IMRC. I have used several online ford parts websites for diagrams or part numbers etc and can not find anything about it for the trucks. I am going to have to pull the intake manifold I guess and see what is going and hope the local dealer can give me some info and sell me the right parts to get it fixed. I am not looking forward to doing this.
