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Truck needs help...

This is a discussion on Truck needs help... within the General Help forums, part of the LSx Technical Help Section category; My brother-in-law just set off for the airforce and the ol' ladies mom gave us her truck my brother-in-law was ...

  1. #1
    Never Drink and Derive Tonik's Avatar
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    Truck needs help...

    My brother-in-law just set off for the airforce and the ol' ladies mom gave us her truck my brother-in-law was using. It's a 2001 Chevrolet Silverado 4.3l v6 (about 140k miles) that he took HORRIBLE care of so I went to work on it today.

    Fuel Filter
    Flushed the crank case
    Oil + filter
    80 bucks worth of gas (holy shit)
    Berrymans (gas tank)
    Cleaned the MAF and Throttle Body
    Hung an IV with TEC
    Cap/Rotor/Plugs/Plug Wires

    Now the problems...

    1. Low Fuel light is on with the gas gauge showing empty though I just spent 80 bucks on gas. He said it's been that way for a while now and every once in a while it will work showing the amount of gas in the tank, the light goes off, but later on it will go back down to nothin and the light will come back on.

    2. The low beam lights don't work. It's possible that its just the bulbs but I didn't get around to that today. When I turn 'em on the lights in the rear work along with the license plate lights but the low beams don't. The high beam lights do work.

    3. It's hard to explain but... the truck ain't got no balls to it. When it down shifts it takes forever to gain speed. 2krpm to 5krpm is ssssllllooowwwww. I figured the tune up would take care of this (considering almost all the plugs were fried) but it's still sluggish. The only thing I can think of to fix this is replacing the MAF if that even helps. EDIT: I had the truck running and unplugged the MAF, there was a little "hiccup" but the engine continued to idle just like it was when the MAF was plugged in, eureka? Thoughts?

    When I got it (before all the work) I checked out the codes at autozone... Catalyst Deficiency, Misfire, and an "unknown code". After the work today I pulled the power wire to rest the ECM and am going to see what codes get thrown now. I'm hoping the Catalytic code was thrown because of the spark plugs (if thats even possible).

    Any thoughts or ideas would be greatly appreciated.

    Thanks,
    Tonik
    Last edited by Tonik; 01-05-2008 at 07:03 PM. Reason: MAF

  2. #2
    Never Drink and Derive Tonik's Avatar
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    Shameless Bump.

  3. #3
    Senior Member Orcus79's Avatar
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    well i can tell you from past experiance for performance what you see is what you get, them v6s are slow in those trucks. Even with the manual tranny,

    The fuel gauge should be easy, chances are all it is a busted ground at the sending unit or the feed wire to the gauge is busted, it happens from time to time.

    Low beams could also be many things but start with a cont check on the bulbs. 2001 uses the indivudual lamps as opposed to the sealed beams yes?

  4. #4
    Veteran 0rion's Avatar
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    the first thing I would do is go buy a haynes manual for it. The one I have only covers through 98 so I'm not sure the wire colors transfer over. Mine show the sending unit as purple and gray. I would ohm that out at the plug coming off the tank to see if the gauge problems are the sender or after the sender. I would imagine it's the sender but I would ohm it out to make sure.
    First order of business for the headlights is to verify the bulbs are good then work from there.
    I would clean that MAF before replacing it. It would be nice to log the truck to see exactly what's going on there. Is the truck still missing at all or cutting out under load? I had that issue with my 4.3 and it ended up being the distributor base was cracked because it's made of plastic and was letting a little moisture in.

  5. #5
    Veteran 0rion's Avatar
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    didn't mean to be redundant I typed this out 30 minutes ago but my wife came and and started talking to me.

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    Check the Cats and make sure they are not plugged. Could be significant back pressure resulting in that cat efficiency code.

  7. #7
    Veteran 0rion's Avatar
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    Quote Originally Posted by aeroengineer View Post
    Check the Cats and make sure they are not plugged. Could be significant back pressure resulting in that cat efficiency code.
    that would also explain the loss in power. I guess I missed that one.

  8. #8
    Never Drink and Derive Tonik's Avatar
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    Update:

    My brother-in-law is retarded and the headlamps just needed new bulbs. (halogens are unnecessarily expensive...)

    I grabbed some MAF cleaner and went to town, it picked it up a bit but still horribly slow.

    Also, I picked up an ohm reader and a haynes repair manual and will see what I can figure out about the gas tank thing later on today when I get a little time on my hands.

    Thanks a lot for all your help.
    Tonik

    EDIT: Holy shit, I just took a look at these wire diagrams and my head hurts. Miller Time.
    Last edited by Tonik; 01-06-2008 at 01:35 PM. Reason: holy shit

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