Carb issue ? - Forums - Official C3 Vette Registry

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Topic: Carb issue ?

in Forum: C3 Fuel, Emission Control, and Exhaust Systems

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Carb issue ? (1/4)
6/20/08 9:08am

warbird
Former Member
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Roseland, NJ - USA

Vette(s):
1974, 454 with 4 on the floor, matching numbers.

Joined: 12/4/2003
Posts: 966

I went to take the beast for a ride today, it started right up, but within a few seconds it almost died out.

I hit the gas a little, it popped through the carb and stayed running. After a few seconds it did it again.

Once the car is warm (about a minute or two) it idles fine, and runs great. This is the third time this has happened, and it only occurs when the car is cold.

My plugs and wires are new, as well as the cap and rotor.

Any idea's ?

Thanks

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Carb issue ? (2/4)
6/20/08 9:33am

Adams' Apple

Lifetime Member
Moderator
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 20129

Sounds like the choke is not closing....that would make it stall when cold, and backfire back thru the carb.
Take the air cleaner lid off and look at it before you start it cold next time. Mash the accelerator pedal a little first, so the choke will shut, then see if it actually closes. It may just need an adjustment, or there may be a linkage issue.
That's where I would start.

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Joel Adams
C3VR Lifetime Member #56
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(click for Texas-sized view!) NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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Carb issue ? (3/4)
6/20/08 11:30am

KDADDY79
Former Member
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484

Hey Warbird,

I had the exact same thing happen with my Q-Jet after it was rebuilt and put back on my '79.

During the initial install it did not happen, probably because the motor never really cooled down enough to show how it would behave when truly cold. The next morning I went to start it and it did just what you described.

The mechanic I took it to adjusted the choke and now it's fine.

I hope your's is just that simple.

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Carb issue ? (4/4)
6/24/08 2:49pm

warbird
Former Member
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Roseland, NJ - USA

Vette(s):
1974, 454 with 4 on the floor, matching numbers.

Joined: 12/4/2003
Posts: 966

Thanks guys,

I'm sorry I didn't respond sooner, had a puter malfunction.

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