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  1. #31

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    Quote Originally Posted by 2ToNe04 View Post
    specs on your motor?
    The chevy truck stopped using TBI in 1995 and moved to SMPI in 1996.
    1997 Chevy Silverado 1500 210K miles:
    350 Vortec/4L60E, 3.42 posi, Underdrive crank pulley, K&N filter, Superchips power programmer, mallory coil, true dual exhaust, torque swirl TB spacer, and more!


    1991 Pontiac Trans Am GTA- L98 Superram
    1992 Subaru SVX LS-L- Way too many mods to list!

  2. #32
    Master Mechanic daddytech's Avatar
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    Mar 2008
    Location
    Portland TN
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    672

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    found out something that helped my wife's suburban with the TBS on it. The 5.7 L has a bad habbit of the exhaust donut gaskets wearing out, usually the passenger side one an d it figures that is the hardest one to change too. but i replaced the ones in our suburban and it made a HUGE difference both in the way the truck ran, pulling power, and mileage. I am assuming the difference is because of the motor not having the proper back pressure on it with the right side leaking at the manifold. hers had a good deal of power even with the manifold leaking some and it still got really good mileage for that size truck all things considered but i was also trying to work out the issue as to why the O2 sensors kept tripping the code in the computer. they were all replaced just after we bought the truck so i knew they weren't bad already.

    so in one fell swoop by replacing the donut gaskets on both sides, I fixed the leak , solved the O2 sensor trip codes, and increased her power and mileage all in one fell swoop. the down side is the motor still roars like crazy when you put your foot in it as evidentally the extra space not only equates to extra power but also extra noise as well.
    I'm thinking about taking off the factory intake air tube and put a cold air intake on it to see if that might help quiet it down some too. the thinking ther is that if the air doesn't have to work as hard to get to the tbi or after it passes through maybe it won't be as loud. we are already running the K&N filter in an open air box under the hood and it's running very nice but loud still.

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