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  1. #1
    Carb and Points!
    Join Date
    Apr 2019
    Age
    25
    Posts
    6

    Unhappy 454 TBI problems!

    I have a 1993 k3500 454 NV4500... The engine is a semi fresh rebuild(50K miles) with a small cam. I have replaced the following some parts multiple times... The truck has a stumbling rough idle. Seems to lack power to me but im not sure. If i take the truck for a short drive when i come back and go to instantly restart it has no fire from injectors....hit it with a little ether and shes up and running again. Im fairly positive i have that narrowed down to a weak oil pressure sensor.(changing it tomorrow). The truck runs pig rich and never seems to go into Open loop.(i think heated 02 will change that). I AM OPEN TO ALL SUGGESTIONS.. out of ideas myself.

    I have a ALDL cable with WinALDL & Tuner pro rt but quite frankly do not know what i am looking for I have attached a copy of my logs at a idle.
    https://docs.google.com/spreadsheets...#gid=361545408

    Parts replaced less than 300 miles ago.( All new with AC Delco parts)

    Completely Rebuilt TBI unit with 2 inch spacer

    New TPS & IAC i did my best to calibrate them

    New map sensor

    Pickup Coil ( Timed at 4 degrees BTDC with connector unplugged)

    Cap rotor & Plugs & Wires

    ICM

    Ignition coil

    o2 sensor ( Re wired from ecu wire was broke assuming when they reinstalled the engine)
    *** I plan on switching to a heated o2 due to my long tubes.

    CTS

    Knock sensor (Wire was also broken)

    Newer fuel pump & Filter 15k ago with all new lines

    Im sure there is plenty others im forgetting. The EGR is deleted as are all other vac lines except MAP,PCV. I am at my wits edge with this truck but i love it very dearly. Hopefully the geniuses on here can help me figure it out. At this point any direction is better than none.

    Thank you very much you can email me at lvoithoffer@yahoo.com Or text me at 724-570-8672 if that is easier.

    Lucas

    Picture of said truck causing me all this heartache

    48239690_10211123930408340_4511094938007502848_n.jpg
    Last edited by Lvoihotffer; 04-07-2019 at 08:00 AM.

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