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Does my MAF sensor need replacing??

This is a discussion on Does my MAF sensor need replacing?? within the General Help forums, part of the LSx Technical Help Section category; Bank One: code:P0171 PCH says bank one is too lean. Bank Two: code:P0174 PCH says bank two is too lean. ...

  1. #1
    SamD_Ind
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    Does my MAF sensor need replacing??

    Bank One: code:P0171 PCH says bank one is too lean.

    Bank Two: code:P0174 PCH says bank two is too lean.

    2000 TA w/ 68k miles...everything is stock.

    Both CATs were replaced in the last 2 years by GM

    If my MAF does need replacing do I get one from a salvage yard or new one?
    Thanks
    Sam

  2. #2
    Grand Imperial Wizard Sarge's Avatar
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    Retired Outlaw Sum Bitch

    I'd clean my MAF firstly....and then replace my o2 sensors. I use this to clean the MAF.... http://www.amazon.com/CRC-Mass-Flow-.../dp/B000EGH57G
    You can get it at NAPA or AutoZone. But I would suspect o2 sensors more than the MAF. Check your o2 wiring firstly.....got any broken or frayed wires?

  3. #3
    Member danziger's Avatar
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    Le Mans Blue
    2004 Z16

    Do you have a local buddy with a LS1? You could swap them out and find out for sure in a few minutes.
    As Sarge opinied, they may not have secured the wires to the O2 sensors when replacing them. This could lead to damage, loose connections or getting burnt.

  4. #4
    Veteran 0rion's Avatar
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    first start out by checking your fuel pressure. Original fuel filter? I would also run some injector cleaner through it. Then I would start looking at the O2's or MAF. No access to a data logger I assume?

  5. #5
    SamD_Ind
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    Thanks guys. NO, I don't have access to a data logger or a buddy with an LS1. What info I got was given to me by a guy at Auto Zone. He read the error & printed the readout for me. It's been over a year since the last CAT was replaced. Also been about a year since I ran injector cleaner thru. Fuel filter is a good idea, haven't changed it since I got the TA about 3 years ago.
    thanks again
    Sam

  6. #6
    Veteran 0rion's Avatar
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    Do you have any exhaust leaks? What about your A.I.R. system? Look at it this way. You're either truly lean and not getting enough fuel somewhere or you're getting extra air in the exhaust stream. The easiest thing to do would be to start with fuel pressure and make sure that's good before you move on. You should see ~58 psi. A gauge is about $20 at any parts store so it's a cheap easy thing to start with. Just put it on the shrader valve on the end of the drivers side fuel rail.

  7. #7
    Impounded
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    Is the car starting and running normal or is is acting funny?I had a check engine light with both banks lean and it turned into 8 clogged injectors.

  8. #8
    Senior Member 35thAnniZ28's Avatar
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    how did you "unclog" the injectors?
    Last edited by 35thAnniZ28; 10-10-2007 at 10:56 PM. Reason: spellig

  9. #9
    Member 346ci's Avatar
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    I'd check the O2 sensors then clean the MAF with brake clean

  10. #10
    Impounded
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    Quote Originally Posted by 35thAnniZ28 View Post
    how did you "unclog" the injectors?
    I didn't,they had to be replaced because they were so badly jammed with rust from the crapo gm carbon steel fuel system design.After i got the check engine light for lean cylinders off and on for about two months it started missing and the light started flashing"TAKE ME TO THE DEALER SO HE CAN RAPE YOUR WALLET"

  11. #11
    Slow SS
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    Neither one of those codes has to do with the maf. More than likly upstream O2 sensors or clogged injectors, get a bottle of injector cleaner and check your pressure. If the car is running at normal RPMs and not idleing funny then I wouldnt worry about an air leak. BTW: most of the time when the kid gives you a guess as to what a code means, He is usually making stuff up. There are a few guys that know what they are talking about, but unless they actually take the time to look at your car and find out more about the problem, they are making it up.

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