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61 Monza Hesitation When Warmed up
Posted by: Corvaddict ()
Date: May 10, 2022 06:35AM

As described, starts and runs well when cold. As soon as warmed up, hesitation will occur, especially when loading it up on a hill, etc. Have placed a resistor in the resistance wire line as someone previously spliced into the line. Changed the coil, checked timing, points, plugs. Not sure where else to go with this. Thx, Corvaddict

Re: 61 Monza Hesitation When Warmed up
Date: May 10, 2022 07:10AM

I had a situation like this and it was a faulty set of brand new points. The pivot was sloppy.

1961 Corvair 700 Sedan - 3sp - Gasoline Heat - Lowered a bit - Rust in Progress



Re: 61 Monza Hesitation When Warmed up
Posted by: MonzaJPD61 ()
Date: May 10, 2022 07:17PM

Check accelerator pump function

B'ham, AL
1961 Monza coupe 98hp, 4spd
1963 Monza coupe 102hp, pg
Vulcan Corvair Enthusiasts
[corvaircenter.com]

Re: 61 Monza Hesitation When Warmed up
Posted by: MattNall ()
Date: May 10, 2022 08:01PM

Disconnect and plug the Vacuum Advance...test drive.

If still there, advance initial timing.... test

MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
...............110-PG.................................................Webered-Turbo

Re: 61 Monza Hesitation When Warmed up
Posted by: Wagon Master ()
Date: May 10, 2022 08:04PM

Well...it runs ok cold. If it still has all its 61 equipment, pull the choke out about 1/4-1/3-1/2 way and see if that helps, If so, you have a lean condition caused by a carb. issue or a vacuum leak. Another telltale symptom of this condition is a spit or cough up through the carb(s). Tell us the results of this test.

Re: 61 Monza Hesitation When Warmed up
Posted by: Corvaddict ()
Date: May 11, 2022 04:29AM

Hello, can't use choke at the moment as the cable is frozen.It is on my list of things to correct. Will let you know as soon as I know on this one. Thank you

Re: 61 Monza Hesitation When Warmed up
Posted by: Corvaddict ()
Date: May 11, 2022 06:49AM

what is the best way to check accelerator pump?

Re: 61 Monza Hesitation When Warmed up
Posted by: MattNall ()
Date: May 11, 2022 08:16AM

As WM suggested Choke 1/2 on.

MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
...............110-PG.................................................Webered-Turbo

Re: 61 Monza Hesitation When Warmed up
Posted by: MonzaJPD61 ()
Date: May 11, 2022 08:51AM

Air filters and housings off, engine idling. While looking into carb throat in good light, open throttle rapidly by hand. You hope to see a good spray of gasoline coming from one side of throat area of carburetor from tiny accelerator pump discharge holes located about an inch deep into throat. Check both carbs, one may be partially or fully plugged. Look carefully, small spray like from WD-40 red tube spray nozzle.

Re: 61 Monza Hesitation When Warmed up
Posted by: MonzaJPD61 ()
Date: May 11, 2022 10:14AM

You don't have to have engine running to do the test

Re: 61 Monza Hesitation When Warmed up
Posted by: Corvaddict ()
Date: May 14, 2022 06:37PM

Have a good sprayin both carbs. Haven't had the car long, do you think the carb floats could be set wrong?

Re: 61 Monza Hesitation When Warmed up
Posted by: MonzaJPD61 ()
Date: May 15, 2022 11:40AM

Yes, good to check next.

Re: 61 Monza Hesitation When Warmed up
Posted by: CorvairHaven ()
Date: May 15, 2022 04:48PM

Corvaddict Wrote:
-------------------------------------------------------
> Hello, can't use choke at the moment as the cable is frozen.It is on my list of things to correct. Will let you know as soon as I know on this one. Thank you



Replace the choke cable! You're choking it to death!

Re: 61 Monza Hesitation When Warmed up
Posted by: Corvaddict ()
Date: May 18, 2022 01:31PM

A followup to all the inputs suggested: Accelerator pump checks ok- good spray , points appear to be ok, adjusted timing, no vacuum leaks observed. Did free up choke, tried it with chokes half closed, seem to run fine. So with no vacuum leaks that I can find, what specifically should I check on the carbs?? The vacuum line from each carb that runs down under the covers goes specifically to what? Thank you.
PS: Also will need to find the choke assembly as I cannot get the slider to cooperate if anyone has any suggestions. Thx

Re: 61 Monza Hesitation When Warmed up
Posted by: Wagon Master ()
Date: May 18, 2022 03:05PM

If each carb. has a vacuum line running under the covers.... you've found your vacuum leak.

Re: 61 Monza Hesitation When Warmed up
Posted by: RexJohnson ()
Date: May 18, 2022 03:08PM

The RH carb vacuum hose should go to the dist. The LH carb vacuum port should be plugged.

RJ tools
Salem,Oregon

Re: 61 Monza Hesitation When Warmed up
Posted by: Corvaddict ()
Date: May 18, 2022 10:15PM

Will be a few weeks before I get to check those lines, I will let you know. Thx

Re: 61 Monza Hesitation When Warmed up
Posted by: Corvaddict ()
Date: June 05, 2022 06:36PM

Still have hesitation to the point stalls some times when shifting to drive or reverse.I corrected the vacuum lines, synced carbs per shop manual, retimed, checked dwell, vacuum gauged it, rechecked fuel filters and flow. I have an engine that sometimes stalls putting into gear, and if not that hesitates, cutout at will...What next???

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