Question about the TBI 305/350.
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5.0 and 5.7 Discussion, Question about the TBI 305/350. in Cadillac Engine Technical Discussion; Why do the TBI 305 and 350's always crank over for an extended amount of time before they fire up? ...
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    I~LUV~Caddys8792's Avatar
    I~LUV~Caddys8792 is offline Moderator
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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?
    "They call Alabama the Crimson Tide, call me Deacon Blues."

    Current:
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    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.

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    I~LUV~Caddys8792's Avatar
    I~LUV~Caddys8792 is offline Moderator
    Automobile(s): 1992 Town Car Cartier & 2014 Accord LX MTX
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    Thread Starter

    Re: Question about the TBI 305/350.

    Ah, sweet. Thanks for the info.
    "They call Alabama the Crimson Tide, call me Deacon Blues."

    Current:
    1992 Lincoln Town Car Cartier Edition (5/14- ?)
    2014 Honda Accord LX MTX Sedan (1/14 -?)

    Past:
    1995 Buick Roadmaster Limited (4/04-12/04)
    1992 Cadillac Sedan deVille (12/04-9/07)
    1999 Mercedes Benz S320 (8/07-7/09)
    2000 Buick Regal GS (7/09-4/12)
    2003 Mercury Marauder (4/12-10/13)
    1991 Buick LeSabre Custom Sedan (9/12-6/13)
    2013 Honda Accord LX Sedan (6/13-1/14)

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