Corvair DiagramCorvair Photo
Corvair Center
home forum corvairs calendar links Corvair Podcast
California Corvairs
Clarks Corvair
Clarks Corvair

Chevy Corvair License Plate
Chevy Corvair Chrome Wheel
Carb booping noise
Posted by: GioGio ()
Date: June 17, 2022 09:42AM

Carb booping noise on one side when cruising on the hiway or sometimes when i am starting the car, i check my ignition everything is good timing is good compression is good ....there is no garage over here that know about corvair ???? its a 1966 monza 110 2 carbs its like a feeling of power lost or fuel that cut I don't know its wierd it make like a boop noise like its the spund of air in the carb

Re: Carb booping noise
Posted by: playerpage ()
Date: June 17, 2022 09:52AM

Is it clogged? When is the last time the fuel filters were changed? The little copper ones that go directly into the carbs. Sometimes it's a small fix.

Eric C. Player
Fargo, North Dakota
MEMBER: CORSA National, Central Coast CORSA, South Coast CORSA, Vintage CORSA, Sfba CORSA, and Great Plains Corvair Club.
THEN: 1965 Monza 110, Canary Yellow - 1965 Corsa 180 Turbo, Red - 1966 Monza 110, Purple - 1967 Monza 140, Red - 1966 500 110, Black; nicknamed "Shadow" - 1965 Monza 110, Camaro Yellow; nicknamed "Silver"
NOW: 1966 Corsa 180 Turbo, Blue; nicknamed "Bluvair"
"He cautioned me not to take notes. It would not have helped if I had, as he would start a paragraph with, 'It is therefore obvious. . .'
and go on from there to matters which may have been obvious to him and God but to no one else."
-- Robert A. Heinlein, character of Daniel B. Davis, 'The Door Into Summer.'

Re: Carb booping noise
Posted by: GioGio ()
Date: June 17, 2022 11:07AM

They have been change i rebuild the 2 carbs last years ????

Re: Carb booping noise
Posted by: Timothy Shortle ()
Date: June 17, 2022 12:10PM

Vacuum leaks? Where are you located? If within 50 miles of me I will stop on by.

Re: Carb booping noise
Posted by: RobertC ()
Date: June 17, 2022 12:12PM

Hard to tell from your description.

A "plugged" fuel filter will result in poor running from idle on.

A piece of girt in the idle tube will result in poor idle, but run fine once fuel delivery switches to the jet (30 - 35+ mph in my case - feeble memory?)

A piece of grit / dirt in the jet - memory cannot retrieve the specifics.

Re: Carb booping noise
Posted by: RexJohnson ()
Date: June 17, 2022 12:31PM

Is it running lean on that one side?

RJ tools

Re: Carb booping noise
Posted by: RobertC ()
Date: June 17, 2022 12:51PM

Timothy Shortle Wrote:
> Vacuum leaks? Where are you located? If within 50 miles of me I will stop on by.

Earlier post state New Brunswick Canada.

Re: Carb booping noise
Posted by: isucorvair ()
Date: June 17, 2022 12:52PM

Pics of your engine compartment could help immensely.

Eric P.
DeWitt, IA

Re: Carb booping noise
Posted by: GioGio ()
Date: June 17, 2022 06:48PM

I live in shediac close to moncton in Canada

Re: Carb booping noise
Posted by: GioGio ()
Date: June 17, 2022 06:59PM

This is my engine if it can help ????

Re: Carb booping noise
Posted by: GioGio ()
Date: June 17, 2022 07:05PM

On that side there is something loose so one carb open before the other one a little bit but people say its not suppose to do that boop noise in the carb tell me if its true haha

Re: Carb booping noise
Posted by: RobertC ()
Date: June 17, 2022 07:45PM

The carbs are supposed to open at the same time.

Instructions on balancing the carbs is in the65 shop manual - and probably places online - Matt Nall has a video?

A number of things are "wrong":

The lever on the passenger side carb throttle shaft is not stock - possibly part of your problem. Better if you can find stock levers.

The balance tube is missing across the front of the engine

Engine shrouds and seal are missing.

Heater hose behind passenger side carb???

Not sure where hose from PCV tube goes - base of passenger side carb?

Early fan - so not sure year of engine?

Re: Carb booping noise
Posted by: KenHenry ()
Date: June 18, 2022 07:57AM

The choke pull offs (plastic cans) should go to the horizontal ports on the carburetors. The distributor vacuum advance goes to vertical port on the pass carb. You have a driver side head on the passenger side. The large ports on the carb pads should both point forward (front of car) and be joined w a balance tube. I think a plug can be knocked and the port moved though I have not done it before. Good luck! Ken

Ken Henry, Rochester, NY USA
1965 Corvair Corsa
140 hp, 4 speed

Re: Carb booping noise
Posted by: steve c goodman ()
Date: June 18, 2022 09:49AM

Several things in your engine pics make me wonder if you have a turbo engine. No choke rods showing/no ports for the balance tube hoses/the turbo upper PCV tube/plus as noted by KenHenry the choke pulloff hoses are on wrong carb ports which means to me the vac advance hose is also connected to the wrong carb port.

To continue you have no cooling tin on the engine and obviously the ground is visible around the engine. This makes the engine run at higher temps. You should not be able to see the ground while looking down from the top. The purpose of the sealing from top to bottom is to ensure that engine cooling air is drawn into the top of the engine through the grill behind your rear window and pushed downward then out the bottom of the engine. With no seperation the heat from the muffler as well as the heat being pushed downward is allowed to recirculate back the the fan again. You are trying to cool the engine with hot air.

Possibly your ignitor ignition is at fault or will be because it doesn't like the higher temps either. Mounting the coil to the engine makes it operate at higher temps.

Sorry because it is easy for all of us to find fault with someones' car and that is not my intent. You need to find club members or other owners around you for some help. I realize you are in Canada but there are numerous members here in Canada. I see two CORSA members in New Brunswick in the roster. Good luck getting the details worked out.

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4

Re: Carb booping noise
Posted by: GioGio ()
Date: June 19, 2022 12:30AM

Thanks guys i both it like that last years hahah but its good to know the ting that is wrong ????

Re: Carb booping noise
Posted by: JimBrandberg ()
Date: June 19, 2022 07:50AM

One thing you can do for troubleshooting is feel the engine with your hand on both sides to see if both sides are warm. With dual exhaust you can feel the air coming out to see if they're both the same temperature. If one side isn't making any power it won't make any heat.
Another way to feel is to accelerate it a bit with one hand and put the palm of your other hand over one carburetor at a time. If sealing off a carburetor doesn't change the way the engine is running that side of the engine isn't making any power.
I don't understand what a "boop" is but firing up through the carburetor may indicate a lean condition.

That looks like it may be an Early engine rather than a 66 110 HP as evidenced by the steel fan and solid crankshaft pulley.
The engine number is down in the valley under where your fuel pressure regulator is. The last 2 letters mean something, something like "RD" or "YC" or maybe just one letter like "Z"...
Perhaps more telling is the head number. The number is vertical on the rear of the right head and the front of the left head It's a 7 digit number, something like "3813xxx" or 3856xxx"... It may be hidden under the small corner shroud.
Also important is the correct distributor for the engine. That number is on the outside of the distributor body just clockwise from the vacuum advance bracket. It's next to the idler pulley on yours. It's a 7 digit number something like "1110272" or 1110319"...

Jim Brandberg
Isanti, MN

Sorry, only registered users may post in this forum.
This forum powered by Phorum.