1979 corvette power trouble.
#1
1979 corvette power trouble.
Lately my vetted had a problem.
I only get about 1/3 to 1/2 my power most if the time. Doesn't matter how want it is or cold. Sometimes I get all my power.
Usually I get it if I drive it a very long amount of time and floor it a while.
When it does the lack of power It also gets alot quieter. Please help
I only get about 1/3 to 1/2 my power most if the time. Doesn't matter how want it is or cold. Sometimes I get all my power.
Usually I get it if I drive it a very long amount of time and floor it a while.
When it does the lack of power It also gets alot quieter. Please help
#2
Race Director
Member Since: Mar 2003
Location: Eustis ( Area 51 Bat Cave ) Fl
Posts: 11,608
Received 772 Likes
on
645 Posts
Hum...could a cylinder be dying? could be fire could be fuel....
When my vw trike would lose one or two jugs thats 1/4 or 1/2 the power and man do you feel it, on the trike a plug wire fell out of the dizzy, perhaps you are loosing fire in a wire...
When my vw trike would lose one or two jugs thats 1/4 or 1/2 the power and man do you feel it, on the trike a plug wire fell out of the dizzy, perhaps you are loosing fire in a wire...
#4
Team Owner
Could be your floor mat is getting under the accel pedal and the throttle carble/linkage is not fully opening the carb. You need to have someone in the car depressing the accel pedal [fully] while you look down into the secondary venturi to see if the throttle plates are vertical (or not). Engine OFF, of course.
#5
Burning Brakes
Could be your floor mat is getting under the accel pedal and the throttle carble/linkage is not fully opening the carb. You need to have someone in the car depressing the accel pedal [fully] while you look down into the secondary venturi to see if the throttle plates are vertical (or not). Engine OFF, of course.
#7
I forgot a super important detail!!!
I can put in neutral and it will rev normally, the sound isn't quiet like it is in gear when it is short on power. No matter what when I put it in neutral it has the sound like it has all it's power
I can put in neutral and it will rev normally, the sound isn't quiet like it is in gear when it is short on power. No matter what when I put it in neutral it has the sound like it has all it's power
#9
Race Director
Member Since: Mar 2003
Location: Eustis ( Area 51 Bat Cave ) Fl
Posts: 11,608
Received 772 Likes
on
645 Posts
Well, I doubt that it's something under the gas pedal,
So it revs fine in netural, no load,
you say it losses sound, so I really believe you are loosing cylinders but not all of them, so again it's fire or fuel...
a choke issue could do it,
Bad wires, rotor, cap plugs, coil
So you say when you get on it a while it clears the problem?
have you taken a look at your spark plugs see what they have to say about it....
So it revs fine in netural, no load,
you say it losses sound, so I really believe you are loosing cylinders but not all of them, so again it's fire or fuel...
a choke issue could do it,
Bad wires, rotor, cap plugs, coil
So you say when you get on it a while it clears the problem?
have you taken a look at your spark plugs see what they have to say about it....
#11
First guess is plugs or wires or both. Wires are old grounding intermittent , plugs fouling . Then I d investigate the ignition . Good steady current flow .
#13
Team Owner
I doubt that Bats is right. (Back at ya, dude....)
We are all just offering suggestions that might cause your problem. NONE OF US knows what the real cause might be. And, the carb not opening fully is a very common problem (whether Bats knows it or not).
We are all just offering suggestions that might cause your problem. NONE OF US knows what the real cause might be. And, the carb not opening fully is a very common problem (whether Bats knows it or not).
#14
Race Director
Member Since: Mar 2003
Location: Eustis ( Area 51 Bat Cave ) Fl
Posts: 11,608
Received 772 Likes
on
645 Posts
I actually wondered if you were joking about carpet bunged up under the pedal as far as this thread was concerned, because this problem isnt there all the time, IE not there in neutral.
I do know carpet or things can get under the pedal, I assumed ( my bad ) most people are in tune enough with their vettes that they would feel a difference in their foot as they pressed the pedal, it would "feel" different if something was under the pedal, well, it would to me.
While I will not agree it's commonly caused by bunged carpet you are very correct and affirming it many shops that set up overdrive state sometime like 60-70% of carbureted cars have a carb that doesn't fully open due to cable/linkage, I also read on this forum the pedal can bend where the cable attaches and cause the carb not to open all the way.
But again, after reading what the op said I still personally feel that his issue is related to a fire and or fuel problem not carb opening all the way ( not that he doesnt have that issue in addition to this ) because he doesn't have the problem in netural for example.
Feel free to doubt I am right I could be dead wrong...my ego can take it,
I was just giving my opinion trying to help the fellow, like you say none of us know for sure what is wrong.
I wasn't dissing you in any way sorry you got all upset, not my intention, ....
#16
Le Mans Master
Member Since: Aug 2006
Location: mount holly NC
Posts: 6,989
Received 1,246 Likes
on
966 Posts
C3 of Year Finalist (appearance mods) 2019
My guess!
Could the spring for the secondary air valve spring be adjusted to tight?
Or as Tonak says, the choke not working correctly and preventing the choke linkage 'lockout' from disengaging.
Or as Tonak says, the choke not working correctly and preventing the choke linkage 'lockout' from disengaging.
#17
Race Director
Member Since: Mar 2003
Location: Eustis ( Area 51 Bat Cave ) Fl
Posts: 11,608
Received 772 Likes
on
645 Posts
On my solex vw stuff I have seen some choke issues come and go...
I bet he does get it going right for you, also from your other post ask him about hopping it up a little...
#18
#19
Race Director
Member Since: Mar 2003
Location: Eustis ( Area 51 Bat Cave ) Fl
Posts: 11,608
Received 772 Likes
on
645 Posts
I had two 81's put over 100K on one as a daily driver, I admit the stock engine wasnt any kind of beast, I do understand why you desire more kick out of your 79, but take your time, be honest with yourself what you really want and how you will really use the car, more isnt always better...my 66 for example, I dropped in a 327 that was likely 300-350 hp it was a little beast to live with as a daily driver, so like I say take your time planning out what you really want, it will save $$$ and headaches.
#20
I had two 81's put over 100K on one as a daily driver, I admit the stock engine wasnt any kind of beast, I do understand why you desire more kick out of your 79, but take your time, be honest with yourself what you really want and how you will really use the car, more isnt always better...my 66 for example, I dropped in a 327 that was likely 300-350 hp it was a little beast to live with as a daily driver, so like I say take your time planning out what you really want, it will save $$$ and headaches.