Is there a cure for the tbi 454??
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Is there a cure for the tbi 454??

  1. #1
    Senior Member H20MOFO's Avatar
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    Default Is there a cure for the tbi 454??

    I've found a clean 88' 4 door dually for 2kish. I've never owned a big block tbi motor before. But the brand new sbc , 1994 3/4 ton 4x4 I bought back in 1994 sucked bad power wise and mileage wise(about 13). Any words of wisdom here?
    Last edited by H20MOFO; 12-02-2009 at 08:30 PM. Reason: sbc
    Another Hot Boat refugee

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    they were pretty strong, not vortec 454 strong, but they got the job done. look into 1 of those airraid tbi spacers that corkscrews the fuel charge into the intake, you just bolt it between the intake and manifold, i'm sure you've seen them before. good k&n replacement air filter in the stock air cleaner , leave the tube that goes to the fender off.it'll pick up bout 2mpg and 30hp, nuff to feel it. i've built alot of tbi injected jeeps, gm's, and by far the best thing bolt on wise , was the airraid spacer under the tbi. i put a hotcam kit in my 93 truck, roller rockers, nice chain set, and could hardly tell the difference. wk later i picked up the airraid spacer and wished i'd just bought it to begin with and never touched the valvetrain

    every gm tech calls the ole gm tbi units "slobber bodies", cause they slobbered in the fuel at low pressure. it doesn't have time to break up fully and you get shit power for it. the lil spacer really breaks up the fuel before it hits the intake.

    Dare to be different, if it turns out great you can claim you planned it that way.

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    Senior Member HighFlyer's Avatar
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    i agree! the airraid spacer is awesome. i had a 90 454ss with TBI and T400 trans. Great truck. I loved it.

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    Restrict the EGR passage, don't block it, just restrict the volume down to 25% of it's original flow. This works on all of the GM throttle body motors.

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    Senior Member EVILFORCE's Avatar
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    Quote Originally Posted by GFINISHLINE View Post
    Restrict the EGR passage, don't block it, just restrict the volume down to 25% of it's original flow. This works on all of the GM throttle body motors.

    You will also get a check engine light. Unless it is chipped or reprogrammed.
    No Fool Like A Old Fool is there?

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by EVILFORCE View Post
    You will also get a check engine light. Unless it is chipped or reprogrammed.
    x2, the ecm looks for a big map sensor voltage increase when the egr opens, if it don't see that, it'll set a lite for the egr valve. we tried that egr tube restriction thing as well alot back in the 90's, it'd work for awhile but always ended up with a check engine lite on. whenever i buy a tbi power truck, i just yank the egr control solenoid plug in loose so it never activates the egr period, who wants hot air goin back in the intake

    Dare to be different, if it turns out great you can claim you planned it that way.

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    Quote Originally Posted by EVILFORCE View Post
    You will also get a check engine light. Unless it is chipped or reprogrammed.
    NO YOU DON'T. The EFI 'sees' the richer mixture and controls the A/F ratio to one that is acceptable to the O2 sensor readings. (it IS NOT BLOCKED, just restricted) My 1995 Sub now has a restricted EGR flow and it runs really great, and economical. (for 3 tons of metal) It has ALL STOCK settings and equipment. No chips, headers, intakes, all stock. NO LIGHTS ON EITHER ! The restricted EGR allows the 'intake vacuum signal' to be stronger and more even across the RPM range. With this modification you may see, more CO and less Hydro carbons durring tail pipe smog tests. But it will PULL from idle to valve spring float. (no flat spots)

  10. #8
    Ralphs club member LSXINDUSTRIES's Avatar
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    pick up a 8.1 for $1200 @ a yard
    Get a stand alone harness for $450
    Get a PCM programmed for $250
    Swap the pump out for a walbro intake 255, or maybe a factory GM late model pump will fit, not sure on your truck

    Stick it in, bolt it up to existing trans and let 'er rip

    Done!
    “I am on a drug. It’s called Charlie Sheen. It’s not available because if you try it, you will die. Your face will melt off, and your children will weep over your exploded body.”



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