joseph p.
Well-Known Member
Hello to all,I got a 1968 383 with a 6 mos since rebuild of my Carter Avs 4bbl,ran perfect, started this hissing sound,too much air induction,maybe the butterflies are stuck open???,thanks for any suggestions.
Whistling hissing air sucking
- Thread starter joseph p.
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joseph p.
Well-Known Member
joseph p.
Well-Known Member
1969 satellite with 383 block.
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First thing is your choke is a bit strong.
joseph p.
Well-Known Member
no,its been set accurately,,thanks
- Local time
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- Joined
- Mar 10, 2010
- Messages
- 32,446
- Reaction score
- 59,817
- Location
- Hanover, Pennslyvania
Then why is it almost closed? Does it ever fully open?
joseph p.
Well-Known Member
Yes I will check the choke,thanks
Macdon221
Well-Known Member
I will second the choke comment....if that engine is warm....your choke is all wrong.
For the whistling....start removing hoses 1 by one and capping the input. That will rule out any hoses. Don't forget to do the choke pull off diaphragm hose.
Did you change a base gasket?
Use a stethoscope to pinpoint the noise if the above does not work. Pay attention to the throttle shafts where they go into the carb. Place scope there.
Slightly re-tighten the carb bolts to see if a change.
For the whistling....start removing hoses 1 by one and capping the input. That will rule out any hoses. Don't forget to do the choke pull off diaphragm hose.
Did you change a base gasket?
Use a stethoscope to pinpoint the noise if the above does not work. Pay attention to the throttle shafts where they go into the carb. Place scope there.
Slightly re-tighten the carb bolts to see if a change.
joseph p.
Well-Known Member
yes it will fully open,I seen it open yesterday from the ride,still was hissing,this vid is from this morning cold start,I checked base plate bolts also,thanks again
joseph p.
Well-Known Member
yes new base gasket.
Macdon221
Well-Known Member
ok well try going back to the old base gasket.
Did you make a change from 4 hole to fully open or vice versa?
Did you make a change from 4 hole to fully open or vice versa?
joseph p.
Well-Known Member
base gasket culprit,thank you guys for the help,yes its stock 4 whole.
joseph p.
Well-Known Member
Pretty good. Members here fixed it and never put a hand on the car!
Macdon221
Well-Known Member
Curious…did you switch from a fully open base gasket to a 4 hole and that’s what caused the sound? Or just a replacement of the sane 4 hole?
joseph p.
Well-Known Member
It was a four whole,,I must of over tightened that bolt.
One of the carb corner bolts was too tight? I have had experience with putting a single hole gasket on an Edelbrock and my 67 GTX and it whistled quite a tune. A correct 4-hole gasket quieted it.
Macdon221
Well-Known Member
I have used a single hole gasket.....and every time i gave it a shot of gas it whistled. I chocked it up to air moving between the carb and the manifold. Put the 4 hole gasket on and it dissappeared
Some Car Guy
Well-Known Member
I’ve got a four hole to change laying here now. I took off a stupid “heat shield” thin piece of metal that only contributed to the fuel boiling and installed a two hole. Dumbest part ever made is that heat shield, why are they sold?
All I could find locally. Solved the issue, but whistles at times. Not always, why I don’t know, seems it would always.
All I could find locally. Solved the issue, but whistles at times. Not always, why I don’t know, seems it would always.
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