Help with my 76 Chevy Nova

[Nova76 10+ year member]

iv had my Nova for about a year now and iv never had a problem with emistions untill now last year it dint pass at first but i just had to readjust my carb and put 104+ and a bottle or rubbing alcohol and it was good and passed now it dint help at all i just changed all the gaskets on it and idk i think the oil pan gasket might still be leaking would that cause it to smoke right as i get into 3rd when im on the gas like half way or more it smells like its running really rich out the exhuast and idk why any help???

Click to read more...

 

[DBDRAGGUY 10+ year member]

it is an expensive game, I hated it when we had it. Sounds like your too rich. May even want to swap to a new carb for the test preferable 2 barrell. too many unburned Flurocarbons or some shit.

 

[dman4486 5,000+ posts]

2 barrel for a 350

maybe for emissions, but you will be choking the hell out of a 350 with 2 barrels

 

[dman4486 5,000+ posts]

is your carb. a vacuum secondary or mechanical?

 

[Nova76 10+ year member]

is your carb. a vacuum secondary or mechanical?

its a holly 650 manual secondary i keep it open thought didnt want to run the cable through the firewall as i had a 4 gauge there before

 

[Nova76 10+ year member]

it is an expensive game, I hated it when we had it. Sounds like your too rich. May even want to swap to a new carb for the test preferable 2 barrell. too many unburned Flurocarbons or some shit.

sheet says 1st idal, precond reading, precond standard, final reading,2nd idle

hydro carbons - 225 178 120 316 250

carbon 3.25 4.62 1.00 4.88 2.00

monoxide

 

[dman4486 5,000+ posts]

its a holly 650 manual secondary i keep it open thought didnt want to run the cable through the firewall as i had a 4 gauge there before

IMO....the reason you are getting emission problems is because you do not know how to drive a mechanical carb. if you get a vacuum secondary i can almost guarantee you will have no smoke or emission fails

and wtf you talking about having "it open" and running a cable through the firewall?

 

[Nova76 10+ year member]

i passed the idel but when i press the gas for the speed teast or whatever it is it smokes way to much the sheets reads the same on the one last year that i passed its just the final readings are WAY WAY to high for it i think like tripled

 

[Nova76 10+ year member]

IMO....the reason you are getting emission problems is because you do not know how to drive a mechanical carb. if you get a vacuum secondary i can almost guarantee you will have no smoke or emission fails
and wtf you talking about having "it open" and running a cable through the firewall?

when i took it to a shop when i first got it they said that i would need to run a cable thru my fire wall to a lever or a puller so i can open and close it but i had a 4gauge wire running throught there befor and i dint want to have to drill a new hole and run it

in the picture the square part closest to the front is the choke i have just been leaving it open because when its closed it wont start or even run if the motor is on and i close the choke it shuts off so the only way to run it is open

and i know how to drive my car just fine thank you very much iv never had a problem with her before this

 

[mlstrass 5,000+ posts]

FYI....carb in the picture is a vacuum secondary. Trying changing to a heavier spring, so it won't open so quickly and richen up too much. Also fresh plugs, clean oil, general tune up...

 

[Nova76 10+ year member]

o well idk the spring is a little loss on it if i cut it a little shorter should that help?

and i changed the plugs and all that before i went in for the 2nd time so the only thing that it could be in my mind is the carb i mean it is old i think it might need a rebuilb because im getting a little better pick up after changeing the leaking gaskets but it seems like somethings wrong with my carb like its robbing power from her

 

[Nova76 10+ year member]

o well idk the spring is a little loss on it if i cut it a little shorter should that help?

and i changed the plugs and all that before i went in for the 2nd time so the only thing that it could be in my mind is the carb i mean it is old i think it might need a rebuilb because im getting a little better pick up after changeing the leaking gaskets but it seems like somethings wrong with my carb like its robbing power from her

 

[Falder 10+ year member]

No, cutting the spring won't help.

 

[Nova76 10+ year member]

what about putting another one on?

 

[Nova76 10+ year member]

its my carb the adjustment screws are all wrong i set them to 1 1/2 or 2 turns out on each side and i checked them when i got home and they were like 4 turns out

what should i do buy a new one, used one or just rebuild this one???//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

o and by the way i put 2 new tighter springs on it helpd it alot its not so loss any more