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Topic: 81 Corvette Carb

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

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81 Corvette Carb (1/5)
3/31/09 6:25pm

Pats81Vette
Former Member
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Grant, AL - USA

Vette(s):
1981 T/Tops , 350V8, A/C, P/S, P/B, A/T,

Joined: 5/28/2008
Posts: 10

Hello can anyone please help i have a 81 vette the carb is electronically controlled carb was overhauled last summer car sat most of the winter now started her up and took for a short ride 25 miles sometimes now when i come to a complete stop in drive it sounds like it is about to stall out and sometimes it does it has the 350v8 with auto trans anything i can do? or would it be best to just get a aftermarket carb like a holley or a elebrook and new distribuator and change over to old system that has a vacum advance with points have had it with the carb and really dont want to spend anymore on this carb any suggestions and help greatly appreciated as was told it is vey costly to get a new carb that is electronically controlled.

Sincerly

Pats81Vette

Patrick Raucci

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81 Corvette Carb (2/5)
3/31/09 11:19pm

Adams' Apple

Lifetime Member
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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: 20128

There's actually only two things on that carb that have anything to do with electronics. The TPS(throttle position sensor), and the mixture control solenoid. The description leads me to believe the MCS is stuck, or possibly gummed up. It is what controls the idle fuel mixture in the carb.
Does the "Check Engine" light come on?

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81 Corvette Carb (3/5)
4/1/09 12:38pm

VetteSpecialties
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Mounds View, MN - USA

Vette(s):
70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe

Joined: 5/24/2007
Posts: 1031

Or the float was replaced with a poor quality one which is sinking (or sticking), and letting the engine flood.

Larry

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81 Corvette Carb (4/5)
5/11/09 2:20am

dskopp
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Oak Creek, WI - USA

Vette(s):
1981 Great White Shark. Red Interior, 350/190hp. PS, PB (SS), A/C CC, T-Tops, Going to remain as Stock as possible. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vetts Car Club. 175,000 Original miles!!

Joined: 5/21/2008
Posts: 1958

The info above is all possible. Having any ECM problems? Sounds like TPS problem (TPS is controled by ECM).

Dan

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81 Corvette Carb (5/5)
5/11/09 11:12pm

KDADDY79
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Dutchess County, NY - USA

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

Joined: 8/27/2007
Posts: 2484

Hey Patrick,

Like they already said, it's probably a carb issue.

As far as the distributor goes, stick with the HEI. You wouldn't want to have to worry about points, IMHO.

Let us know how it goes.

Kevin

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