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Topic: 1980 L-48 hesitation

in Forum: C3 Engines


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1980 L-48 hesitation (1/6)
 6/15/11 10:46am
kwgilf
Former Member

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Kentwood, MI - USA

Vette(s):
Currently own: 1980 L-48 automatic. Custom painted in gray metal flake with silver hood accent. Oyster interior. Previously owned: 1976 silver Sting Ray with black interior. 1980 L-48 black with oyster interior.


Joined: 6/11/2011
Posts: 10

While cruising, not while accelerating, there is a very slight hesitation. When the A/C is on, this is more noticeable. Any ideas what is causing this?
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1980 L-48 hesitation (2/6)
 6/15/11 1:14pm
aceintheholeLifetime Member
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Manteca, CA - USA

Vette(s):
1978,two tone,Metalic Rootbeer & gold 1975 L48 4 speed


Joined: 11/20/2005
Posts: 3623

Hi Kevin, need a little more description. Do you mean as you are cruising at a steady speed, without depressing the acceleratorthe motor coughs or stutters or something ?

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1980 L-48 hesitation (3/6)
 6/15/11 1:35pm
kwgilf
Former Member

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Kentwood, MI - USA

Vette(s):
Currently own: 1980 L-48 automatic. Custom painted in gray metal flake with silver hood accent. Oyster interior. Previously owned: 1976 silver Sting Ray with black interior. 1980 L-48 black with oyster interior.


Joined: 6/11/2011
Posts: 10

Yes, cruising at a steady speed without depressing the accelerator. It doesn't cough or stutter, just a slight rhythmic hesitation that is more noticeable when the A/C is on. I replaced the fuel filter and it did not improve.
1980 L-48 hesitation (4/6)
 6/15/11 1:41pm
Adams' AppleLifetime 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

[QUOTE=kwgilf] just a slight rhythmic hesitation that is more noticeable when the A/C is on. [/QUOTE]

Are you sure what your feeling is NOT the A/C compressor kicking in/out?
Other than that, it could be the EGR valve, or the solenoid for it not operating properly....


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1980 L-48 hesitation (5/6)
 6/15/11 3:31pm
kwgilf
Former Member

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Kentwood, MI - USA

Vette(s):
Currently own: 1980 L-48 automatic. Custom painted in gray metal flake with silver hood accent. Oyster interior. Previously owned: 1976 silver Sting Ray with black interior. 1980 L-48 black with oyster interior.


Joined: 6/11/2011
Posts: 10

It also hesitates when the A/C is off, just not as noticeable.
1980 L-48 hesitation (6/6)
 6/22/11 8:57pm
kwgilf
Former Member

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Kentwood, MI - USA

Vette(s):
Currently own: 1980 L-48 automatic. Custom painted in gray metal flake with silver hood accent. Oyster interior. Previously owned: 1976 silver Sting Ray with black interior. 1980 L-48 black with oyster interior.


Joined: 6/11/2011
Posts: 10

Broke down and took it to a mechanic. EGR Valve was ok, carb was running too lean. Adjusted carb and everything is good. Thanks all for the comments, 
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