puddling of fuel....
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From: Moorestown, NJ
Car: 88 Camaro SC
Engine: SFI'd 350
Transmission: TKO 500
Axle/Gears: 9-bolt w/ 3.23's
puddling of fuel....
Well... Having trouble w/ fuel puddling in intake manifold. I dissasembled the tbi unit and ultrasonically cleaned the injectors so there is no leaking and the spray cone is well defined. On start up, however, the fuel tends to puddle in the bottom of the intake manifold. I heard that there is a swirl plate located below the tbi unit but i don't see anything that looks like this (but then again, I probably wouldn't recognize it if it came up and bit me in the ***).
What does this part look like and would not having it cause my problem?
What does this part look like and would not having it cause my problem?
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Joined: Oct 1999
Posts: 6,621
Likes: 2
Car: 91 Red Sled
Axle/Gears: 10bolt Richmond 3.73 Torsen
You've lost me on a few things. How do you know it's puddling in the bottom of the intake manifold?
From what I know, a cold startup should run slightly rich. This is normal but you said you're having "problems" so if you would elaborate a bit more. As for the spinning things under the TB, that went as far as the crossfire TBI in the early 80's. Crossfire was the only TBI system by GM that I know of that used those swirl makers (aka slow down air and rob power potential pieces of ____).
If you are looking into the TB bores and see extra fuel laying on the throttle blades, not to be mistaken by the bottom of the intake manifold, then that too is normal to an extent. The fuel will eventually run over to the sides of the throttle blades and atomize from the shearing speed of the air passing around them.
I hope this clears a few things up for you. Don't bother looking for any spinners and such, their aren't any on later model TBI systems.
If the fuel is puddling at the bottom of the intake manifold and you know that for a fact than you're obviously too rich. From the way that you described it I don't think you're talking about the bottom of the intake manifold and rather the top of the throttle blades.
From what I know, a cold startup should run slightly rich. This is normal but you said you're having "problems" so if you would elaborate a bit more. As for the spinning things under the TB, that went as far as the crossfire TBI in the early 80's. Crossfire was the only TBI system by GM that I know of that used those swirl makers (aka slow down air and rob power potential pieces of ____).
If you are looking into the TB bores and see extra fuel laying on the throttle blades, not to be mistaken by the bottom of the intake manifold, then that too is normal to an extent. The fuel will eventually run over to the sides of the throttle blades and atomize from the shearing speed of the air passing around them.
I hope this clears a few things up for you. Don't bother looking for any spinners and such, their aren't any on later model TBI systems.
If the fuel is puddling at the bottom of the intake manifold and you know that for a fact than you're obviously too rich. From the way that you described it I don't think you're talking about the bottom of the intake manifold and rather the top of the throttle blades.
Thread Starter
Supreme Member
iTrader: (2)
Joined: Jan 2002
Posts: 9,962
Likes: 5
From: Moorestown, NJ
Car: 88 Camaro SC
Engine: SFI'd 350
Transmission: TKO 500
Axle/Gears: 9-bolt w/ 3.23's
I opened the throtle body up and i saw the fuel laying on the bottom of the manifold. But I found where the problem was. The spark plugs where gapped to .07" and the timing was way off. Fixed it this morning and that clared things up a bit. This is my first gm(my last car was a getto'd out rice burning honda accord) so i dont know much about the systems. Thanx a buch though, thought all units had them.
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