Notices
C1 & C2 Corvettes General C1 Corvette & C2 Corvette Discussion, Technical Info, Performance Upgrades, Project Builds, Restorations
Sponsored by:
Sponsored by:

1964 Stalls

 
Old 07-09-2019, 06:42 PM
  #1  
Rob64
Junior Member
Thread Starter
 
Member Since: Jul 2019
Posts: 4
Likes: 0
Received 0 Likes on 0 Posts
Default 1964 Stalls

Fellow members, Thanks for letting me join your group. I have a 64 automatic, completely stock as original. When I come to a stop light the engine idles uneven and then all of a sudden stalls. It starts right up again and runs perfect while Iím driving. It happens when the engine is warmed up. It is not over heating. Temp perfect at 180 degrees. Can anyone help?
Rob64 is offline  
Old 07-09-2019, 07:12 PM
  #2  
2009stanger
CF Member
 
2009stanger's Avatar
 
Member Since: Jan 2010
Location: Elkridge, Maryland
Posts: 58
Received 5 Likes on 4 Posts
Default

Have you checked your slow idle screw on your carburetor? Iíve had mine set too low and it would stall out. I believe that if you turn it clockwise it will increase your rpmís when you are idling.
2009stanger is offline  
Old 07-09-2019, 07:13 PM
  #3  
856666
CF Senior Member
 
856666's Avatar
 
Member Since: Jan 2013
Location: Asheville NC
Posts: 1,075
Received 86 Likes on 75 Posts
Default

Hi Rob,

Welcome to the forum

I would check for a vacuum leak - hoses, or carb base gasket

Phil
856666 is offline  
Old 07-09-2019, 07:38 PM
  #4  
DansYellow66
CF Senior Member
 
DansYellow66's Avatar
 
Member Since: Jan 2003
Location: Central Arkansas
Posts: 10,955
Received 741 Likes on 664 Posts
Default

What have you done on the car to date in an effort to fix it?
DansYellow66 is offline  
Old 07-09-2019, 08:04 PM
  #5  
Rob64
Junior Member
Thread Starter
 
Member Since: Jul 2019
Posts: 4
Likes: 0
Received 0 Likes on 0 Posts
Default

There is a vacuum hose going into the power brake booster could this do it? I can check this and the other vacuum hoses too. Thanks
Rob64 is offline  
Old 07-09-2019, 08:05 PM
  #6  
Rob64
Junior Member
Thread Starter
 
Member Since: Jul 2019
Posts: 4
Likes: 0
Received 0 Likes on 0 Posts
Default

I’ve had a new carb installed with new gaskets of course. Professionally done by corvette restorer. I don’t hear a gasket leak. I think it may be electrical because it stalls but more like shutting off. Seems like a connection? I’ve changed the coil.
Rob64 is offline  
Old 07-09-2019, 10:27 PM
  #7  
wolfman64
CF Senior Member
Support Corvetteforum!
 
wolfman64's Avatar
 
Member Since: Jan 2008
Location: San Antonio Texas
Posts: 1,201
Received 84 Likes on 63 Posts
Default

Originally Posted by Rob64 View Post
Iíve had a new carb installed with new gaskets of course. Professionally done by corvette restorer. I donít hear a gasket leak. I think it may be electrical because it stalls but more like shutting off. Seems like a connection? Iíve changed the coil.
Try disconnecting the wiring harness block at the firewall...Clean both sides and reconnect...
wolfman64 is offline  
Old 07-09-2019, 10:32 PM
  #8  
wolfman64
CF Senior Member
Support Corvetteforum!
 
wolfman64's Avatar
 
Member Since: Jan 2008
Location: San Antonio Texas
Posts: 1,201
Received 84 Likes on 63 Posts
Default

wolfman64 is offline  
Old 07-10-2019, 07:35 AM
  #9  
Frankie the Fink
CF Senior Member
Support Corvetteforum!
 
Frankie the Fink's Avatar
 
Member Since: Aug 2007
Location: Orlando Metro Area Florida
Posts: 49,999
Received 4,026 Likes on 3,091 Posts
Default

I don't think its electrical, when the bulkhead connector is an issue there is usually a dramatic loss of power...

It does sound like a vacuum leak - the first thing is to snug down the carb mounting bolts and check all rubber hoses (PCV, vacuum advance, brake booster if there is one, etc.). Wouldn't hurt to put a vacuum gauge on the car and post what you see here (if you can get it to idle)..
Frankie the Fink is offline  
Old 07-10-2019, 08:24 AM
  #10  
Railroadman
CF Senior Member
 
Railroadman's Avatar
 
Member Since: Aug 2008
Location: Rochester NY
Posts: 23,232
Received 616 Likes on 405 Posts
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16-'17-'18-Ď19

Default

A few questions - did it do this BEFORE you put the new carb on, or only afterwards? What other changes or adjustments did you make just before it started? And last, does it do this EVERY time, or just randomly?
Railroadman is offline  
Old 07-10-2019, 10:34 AM
  #11  
SWCDuke
CF Senior Member
 
Member Since: May 2000
Posts: 10,292
Received 599 Likes on 408 Posts
Default

Connect a test tach/dwell meter and vacuum gage to the engine. (I am assuming you have this equipment and know how to connect it.) Adjust dwell if required, and test the VAC with a vacuum pump to determine the start and stop points. Set initial timing at 8- 10. Also, report the ID data on the VAC mounting bracket.

Once any found problems above are solved, perform the idle speed mixture/speed adjustment procedure in your 1963 Corvette Shop manual. This must be done in DRIVE, so set the parking brake firmly and double chock at least one wheel. Target idle speed in Drive is 450 to 500 assuming an OE cam, however, if it has a higher overlap aftermarket cam higher idle speed will likely be required and you may not be able to achieve a smooth idle. High overlap cams and an automatic transmission are a bad combination.

Report your final idle speed and vacuum readings.

If the carb is an AFB the initial idle mixture screw setting is 1.5 turns out from the seat. lf a WCFB, consult the shop manual.

Duke

Last edited by SWCDuke; 07-10-2019 at 10:48 AM.
SWCDuke is offline  
Old 07-10-2019, 10:06 PM
  #12  
wolfman64
CF Senior Member
Support Corvetteforum!
 
wolfman64's Avatar
 
Member Since: Jan 2008
Location: San Antonio Texas
Posts: 1,201
Received 84 Likes on 63 Posts
Default

I’ve had a new carb installed with new gaskets of course. Professionally done by corvette restorer. I don’t hear a gasket leak. I think it may be electrical because it stalls but more like shutting off. Seems like a connection? I’ve changed the coil.

Following the electrical path...Did you change the ballast resistor when you changed the coil?...I have recollection of a bad ballast resistor being the source of an intermittent stalling issue I had on my '64 327/365 many years ago.

Wolf



Last edited by wolfman64; 07-10-2019 at 10:07 PM.
wolfman64 is offline  
Old 07-11-2019, 10:43 PM
  #13  
Rob64
Junior Member
Thread Starter
 
Member Since: Jul 2019
Posts: 4
Likes: 0
Received 0 Likes on 0 Posts
Default

Thanks for all the advice. I thought it best to have the restorer take the car to the shop. I’ll report back results when I get the 64 back.

To to answer some of the questions, the car ran strong with no stalling last fall. This spring also ran strong until I took it on an 1 1/2 hr drive then the stalling started. It’s not intermittent it happens all the time when in drive. I haven’t touched the carb since it was repaired. All hoses seem ok. The vacuum hose from break booster is a bit loose. I didn’t replace the ballast resistor. It could be anything that’s why I’m have the mechanic check it out. He only works on old vettes.

Stay tuned and thanks for the help.
Rob64 is offline  
Old 07-11-2019, 11:30 PM
  #14  
Railroadman
CF Senior Member
 
Railroadman's Avatar
 
Member Since: Aug 2008
Location: Rochester NY
Posts: 23,232
Received 616 Likes on 405 Posts
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16-'17-'18-Ď19

Default

Did you perhaps buy crap gas on that 1 1/2 hour cruise?
Railroadman is offline  
The following users liked this post:
Dan Hampton (07-12-2019)
 


Thread Tools
Search this Thread
Quick Reply: 1964 Stalls


Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: