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Thread: Question about the TBI 305/350.

  1. #1
    I~LUV~Caddys8792's Avatar
    I~LUV~Caddys8792 is offline Cadillac Owners 10000+ Posts
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    Question about the TBI 305/350.

    Why do the TBI 305 and 350's always crank over for an extended amount of time before they fire up? If you compare a L05 and LT1, the LT1 will fire up in a second, and you've gotta crank the TBI version over for a few seconds to get it to start up... Is it because the TBI versions will use much less fuel pressure?


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  3. #2
    kevm14 is offline Cadillac Owners Connoisseur
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    Re: Question about the TBI 305/350.

    Holy crap I just discovered this forum. Now I have two Cadillac Forums to check on.

    Anyway.

    The reason is pretty much because of the way the fuel system works. Unlike a carb you can't prime the manifold by simply pressing the gas pedal. The injectors, which sit over the throttle body, don't fire until the engine turns and it takes a few revolutions for the fuel to reach the cylinders, especially in a cold engine where the fuel is not going to atomize - it pools. However, I find TBI cars to be very quick firing when warm, easily as fast as an LT1, maybe a little faster. LT1s have port fuel injection and the fuel sprays right onto the back of the intake valves.

    On your next cold start try feeding a little bit of throttle (experiment on the amount). Mine starts faster this way but I actually prefer the extended cranking in the winter because it gives the oil pump a chance pressurize the engine (well, a head start) before it actually develops any torque and thus pressure on the bearings.
    Last edited by kevm14; 06-17-08 at 04:44 PM.

  4. #3
    I~LUV~Caddys8792's Avatar
    I~LUV~Caddys8792 is offline Cadillac Owners 10000+ Posts
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    Re: Question about the TBI 305/350.

    Ah, sweet. Thanks for the info.


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