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96 3.4 making sucking sound

Discussion in '1st Gen. Tacomas (1995-2004)' started by debber, Jul 9, 2020.

  1. Jul 9, 2020 at 9:46 PM
    #1
    debber

    debber [OP] New Member

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    jeff
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    96 toyota tacoma 3.4 L
    My 96 3.4 makes a sucking sound only when I throttle up under load. It sound like heavy intake. I just replaced the intake tube there is no vacume leaks that i can see. Its also running poorly,no powed crappy gas mileage. Would a bad egr valve cause this problem? please help
     
  2. Jul 9, 2020 at 10:18 PM
    #2
    Chako

    Chako Well-Known Member

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    Utah
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    1998 TRDOR M/T 2020 TRDOR M/T
    My truck also growls when its opened up under load. Its probably nothing to be worried about. The rough running could be spark plugs, injectors, fuel filter/pump.
     
  3. Jul 9, 2020 at 10:56 PM
    #3
    Glamisman

    Glamisman Well-Known Member

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    I suspect a partially plugged cat.
     
    Abeyancer likes this.
  4. Jul 10, 2020 at 1:51 AM
    #4
    Lukass

    Lukass Well-Known Member

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    Bilstein 5100’s
    Do we have EGR valves??
     
  5. Jul 10, 2020 at 6:18 AM
    #5
    0xDEADBEEF

    0xDEADBEEF Well-Known Member

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    Rust, dents, miles, extra metal.
    Should be able to isolate it pretty quickly by idling it in your driveway and turning the throttle body by hand and listening. It sounds to me like a loose vacuum hose though - there should be a routing diagram on the underside of the hood that would be good to reference while chasing them all down.
     
    1997tacomav6 likes this.
  6. Jul 10, 2020 at 6:24 AM
    #6
    JEEPNIK

    JEEPNIK Well-Known Member

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    I’m going with vacuum leak. The age of the truck makes me wonder if the lines have ever been changed. Get a test gauge.
     
    1997tacomav6 likes this.
  7. Jul 11, 2020 at 2:03 PM
    #7
    1997tacomav6

    1997tacomav6 V6 5sp,RegCab,TRD Supercharger,2"pulley,meth, 660k

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    97 reg cab, v6 5sp 300hp supercharged, Methonal Injection, 660,001 plus miles, Original Owner
    V6 5sp,RegCab,TRD Supercharger, 2" pulley, methanol injected AC TRD supercharger,(MUST DO) TRD supercharger ported, rebuilt 3 times over 500,000 miles, every 125,000- 150,000 needs rebuild Projector headlights HID 5 speed manual Amsoil for all drive train Smaller 2” pulley,(300hp) (MUST DO) 2004 DESNO fuel injectors, zero ping ping, 2004 side door mirrors Dick Cepek Rims, Michelin tires LTX, ( that last 100,000 miles) Now running Dynopro ATM mud and snow tires KN cold air intake Cat back exhaust with ss exhaust tip, Raised exhaust tail pipe to 2" below body line Optima*dry cell battery,red top Alpine sirius radio, 200 watt amp, focal is165 split door pod speakers Focal door speakers Subwoffer behind seat Viper alarm, Electric Locks Dark tinted windows, 4runner bucket seats, Tacoma Rubber floor mats TRD fender extenders, Bilstien shocks chrome push bar, chrome nerf bars, add a leaf for rear springs trailer iv hitch, electric brake control, Drilled slotted brakes, High carbon steel (MUST DO) EBS green stuff 7000 series pads(MUST DO) TRD engine oil cap TRD stick shift, Rear sliding window 2002 4Runner functional hood scoop cut into Tacoma hood, 4Runner dual overhead map light Gentex Auto dim + Compass + Temp, garage,rearview mirror Corbeau bucket seats Snow Methonal kit stage 2 Champion 3 core aluminum radiator Linex bed liner
    X3, you have a vacuum leak somewhere
     

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