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Fisherdude, I changed plugs about a month and a half ago. I actually swung by autozone today after work and asked the guy to plug in the diagnostic tool for me, which he didn't really care to do since the service engine soon light was not on at the moment, but tried anyway, and sure enough it threw out the lean bank 1 and lean bank 2 codes, or something along those lines( I didn't get a chance to write down the codes). The guy said that when it's just one of the codes I mentioned, it's the O2 sensor, but when it's both the codes I mentioned, it's mass air flow sensor. Does this sound right? I hate to spend $140 on a mass air flow sensor when that's not the problem. Thanks again.
You should be able to get an actual code off of the reader. Once you get the code you can find a website that will tell you what it means. Like this site. http://www.aa1car.com/trouble-codes/codes_699.htm
 

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Discussion Starter · #23 ·
Sell it to me. I'll take that POS off of your hands.
Easy there critter, me and this ol' gal have been through alot. She's taken care of me for about 100,000 miles so far and is beautiful inside and out, but I will say, she's being a bit of a ****** right now. Once we get this minor issue taken care of, she'll be as good as new again.
 

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Discussion Starter · #30 ·
Just got the diagnostic codes, PO171 and PO174, went to the website that tells what they are and I'm not too sure what they mean.
 

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Water does not circulate through the intake on a 5.3L that is not going to cause lean issues like po171-po174. My first guess would be dirty fuel injectors and plugged fuel filter, feel free to call me with any questions.......Jay
 

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ya'll are slaying us...

Would that be the gasket where the exhaust pipe meets the intake manifold?
....ya'll gotta keep this diagnostic going. We're just four bored mechanics sitting around on a slow afternoon. This is very entertaining. Seriously, and I'm not trying to be rude, but if you think the intake manifold is connected to the exhaust pipe you need to do your truck a favor and pay the $80 for a real diagnostic test. Then put a padlock on the hood and give the key to your mechanic.
Lean and rich fuel mixture codes are very general (non-specific) codes and can require alot of things to be checked before you find the fault. It is not the kind of code that pops up and says "replace this part". Very few codes are that descriptive. Good luck. I really do hope it dosen't cost you an arm and a leg to repair this thing but ya'll need to understand that what AutoZone does is not diagnostic. They pull the code and give you a list of possible causes (which they would love to sell you the parts for). Also understand that the list of 3 possibles is not all the possibles.
P.S. For all you guys out there running K&N and other "oiled" air filters you are just asking for lean codes resulting from a contaminated MAF.
 

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Discussion Starter · #33 ·
....ya'll gotta keep this diagnostic going. We're just four bored mechanics sitting around on a slow afternoon. This is very entertaining. Seriously, and I'm not trying to be rude, but if you think the intake manifold is connected to the exhaust pipe you need to do your truck a favor and pay the $80 for a real diagnostic test. Then put a padlock on the hood and give the key to your mechanic.
Lean and rich fuel mixture codes are very general (non-specific) codes and can require alot of things to be checked before you find the fault. It is not the kind of code that pops up and says "replace this part". Very few codes are that descriptive. Good luck. I really do hope it dosen't cost you an arm and a leg to repair this thing but ya'll need to understand that what AutoZone does is not diagnostic. They pull the code and give you a list of possible causes (which they would love to sell you the parts for). Also understand that the list of 3 possibles is not all the possibles.
P.S. For all you guys out there running K&N and other "oiled" air filters you are just asking for lean codes resulting from a contaminated MAF.
I think it's quite obvious that I'm not a mechanic, and I actually meant the exhaust pipe to (exhuast)manifold gasket, but going back to your post..I know there are alot of mechanics and people with alot of mechanical knowledge on here, which is why I'm asking these questions. If money wasn't an option, I would do just what you said, take it to a mechanic or dealer, but money is an option, which is why I haven't. The thing with that is, if I take it somewhere and it's something that can be fixed in 30 minutes, and was fixed in 30 minutes(give or take), when I go back to pick up my truck my receipt says 2 hours labor. At $70 an hour, that hurts. Now I know there are very good mechanics and very honest mechanics out there, so this is not an insult to anyone, I'm just sayin it would be nice to be able to find out what the problem is and purchase the part online(so I don't get ripped off with that too), and if the installation is too difficult, take it to a mechanic for installation. I know what my limitations are and I'm not gonna start taking my truck apart. This is my only mode of transportation so I can't afford to be without a vehicle.
 

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My point was if you take it to someone it is going to be cheaper in the long run than you buying parts that you dont need to fix your problem. You may get lucky and stumble onto the problem and fix it the first time but all its going to be is luck.
 

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i am a professional mechanic, my father and I own a shop which my father started 16 years ago,

Trouble codes PO171, PO174 are as you thought lean codes. Can be caused by a vacuum leak, fuel pump, fuel pressure regulator, and several other things. These codes are time consuming to find are even harder when they are intermittant. Without the proper tools your will never find this problem. Until you take it to someone who does you are wasting time, money and effort.
 

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Discussion Starter · #36 ·
Sprayed some throttle body cleaner on the intake gaskets while the engine was idleing and the idle roughed up a bit, happened when I sprayed it on both sides. So I guess that's it, need to replace the intake gaskets. At least that's my next step. Thanks for all the info and help, it's much appreciated.
 
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