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Topic: Misfire at full throttle

in Forum: C3 Engines

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Misfire at full throttle

Posted: 9/22/21 7:55pm Message 1 of 4
bcampanelli
Former Member
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Lakewood, CA - USA
Joined: 5/25/2021
Posts: 1
Vette(s): 1981 Corvette

Getting on the freeway and at full throttle I get a bad backfire and sputter and no power. Back off the throttle about 1/2 inch 

and stops and runs normal.  At full freeway speed and I floor the pedal, kicks into passing gear without any hesitation. Only seems to be from dead stop and full load. Any thoughts.

New plugs, new wires, distributor cap, rotor and module. 




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Re: Misfire at full throttle

Posted: 9/30/21 5:55pm Message 2 of 4
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danascar
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Germansville, PA - USA
Joined: 1/28/2010
Posts: 859
Vette(s): 1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats. . 1999 C5 Convertible, 6 speed, Atomic orange, Oak interior.

Could possibly be a bad coil if you have one,  that breaks down under the heavy load. Just a thought.

 



|UPDATED|9/30/2021 5:55:59 PM (AZT)|/UPDATED|



   

DanT

Re: Misfire at full throttle

Posted: 9/30/21 6:26pm Message 3 of 4
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
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

You list a cap, rotor, and module, but no coil? Could certainly be a coil failing, but I would also suspect a carb issue. 




Joel Adams
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Re: Misfire at full throttle

Posted: 11/29/21 1:59pm Message 4 of 4
Mark Laird
Former Member
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Milford, DE - USA
Joined: 11/6/2021
Posts: 67
Vette(s): 1977 C3 Auto Coupe Lt Blue/Dk Blue Prev. 1968 C3 convertible 4spd Red 1984 C4 Automatic Silver 2000 C5 Automatic Black

I had the same problem when I had my 68.. All I had to do was replace the manual fuel pump with a high performance one..Problem went away...Kept breaking down at full throttle..Old timer told me to replace fuel pump with high performance one and the problem was solved.

 

Good Luck!




in Forum: C3 Engines


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