1969 GTO dies while running and now will not start - Pontiac GTO Forum
User Tag List

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 14 (permalink) Old 08-03-2015, 09:53 AM Thread Starter
 
Join Date: Aug 2015
Location: Central Illinois
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
1969 GTO dies while running and now will not start

Hello everyone, I have a question on a 1969 GTO, 400 block rebuilt a few years ago with a newer Edelbrock carb installed last year, car has been running great up until yesterday, we took it on a pretty good run since the rebuild and was just getting ready to pull her into the garage and the idle seemed unusually high so I tapped the gas pedal to get the idle down and it sputtered and dies, have not been able to get it to stay running since. It will crank over and I can get the car to start and run by holding the gas a little but it just will not run without some pressure on the gas pedal, if I place too much pressure on the gas pedal it sputters out and dies, if I let off the gas pedal it sputters out and dies, it acts like the choke is stuck or something like that. Any ideas would be greatly appreciated from the experienced GTO crowd here. This car has been in my family for over 40 years. 1969 GTO, 400 (from a 67), 4 Speed with 3.55 gears, mostly original and very well cared for but sat for years after the rebuild.
mcarpani is offline  
Sponsored Links
Advertisement
 
post #2 of 14 (permalink) Old 08-03-2015, 01:06 PM
 
pjw1967's Avatar
 
Join Date: Mar 2014
Location: The Woodlands, TX
Posts: 440
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Check to make sure a vacuum line hasn't come off. I had those symptoms when the vacuum fitting on the front of the manifold just decided to come loose.
pjw1967 is offline  
post #3 of 14 (permalink) Old 08-04-2015, 06:57 PM
Super Moderator
 
BearGFR's Avatar
 
Join Date: Aug 2008
Location: Springtown, TX
Posts: 5,742
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 122 Post(s)
Garage
- especially if you have power brakes and that's the line that has come loose.

Bear

BearGFR
Springtown, TEXAS
BearGFR is offline  
 
post #4 of 14 (permalink) Old 08-05-2015, 09:30 AM
64-67 Expert
 
geeteeohguy's Avatar
 
Join Date: Feb 2008
Location: Fresno, California
Posts: 8,543
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 118 Post(s)
Also check the points. Make sure the dwell is where it needs to be. Check the rotor. I've had the tangs come off. Look at the choke. Is it indeed stuck closed? When the car is barely running, have a helper spray some carb cleaner down the carb. (Fire extinguisher handy!) Does the car speed up when you spray? If so, it's too lean. Look for a vacuum leak. I think your points/ignition system got a hiccup, or a vacuum line popped off, as the other guys said. Let us know what you find!
geeteeohguy is online now  
post #5 of 14 (permalink) Old 08-05-2015, 08:07 PM Thread Starter
 
Join Date: Aug 2015
Location: Central Illinois
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thank you all for the replies, my initial thought was vacuum but after checking there are no vacuum leaks so I am going to check points this weekend. Its very strange as I can start the car and keep it running with a slight bit of throttle, as soon as I let off that slight throttle it sputters out and dies. Its an edelbrock 1404 carb and has been running a little rich. Again thank you all for assisting I will post more results this weekend.
Attached Thumbnails
Click image for larger version

Name:	IMAG00053.jpg
Views:	121
Size:	525.1 KB
ID:	62234  
mcarpani is offline  
post #6 of 14 (permalink) Old 08-06-2015, 03:15 AM
 
Join Date: Aug 2015
Location: Alaska
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Also check for fuel contamination like rust or water. Disconnect the fuel line at the carb and pump some gas into a glass jar by having a friend crank the engine. If it looks cloudy you may have water in the fuel. In cold climates we try store cars with near full tanks to prevent water condensation. Water collects below the gas and the gas will look cloudy when stirred up.
67post coupe is offline  
post #7 of 14 (permalink) Old 08-24-2015, 10:19 AM Thread Starter
 
Join Date: Aug 2015
Location: Central Illinois
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
First off, thank you all for the replies. I truly appreciate the help here. I have been at this a few days here and checked all vacuum lines and they are good, points test out good, fuel does not look contaminated at all. I have an Edelbrock 1404 and it looks to me like the choke is getting stuck open, this has an electric choke but it's not hooked up. I can force the choke closed and the car will start and idle, once I tap the gas the car dies as the choke gets stuck open, once the car is dead I tap the gas pedal again and the choke will close. I can then start the car again, it will idle and again I tap the gas to get the idle right and the choke opens again and the car dies.
I have never hooked the electric choke up on this carb, again the car was running perfectly fine, then all of a sudden it wouldn't start. Closed the choke manually by hand under the hood and it started? I am going to remove the carb and clean the crap out of it this week to see if that helps. Again, I appreciate the comments and I appreciate any advice, assistance and wisdom you might add here.
mcarpani is offline  
post #8 of 14 (permalink) Old 08-24-2015, 12:23 PM
64-67 Expert
 
geeteeohguy's Avatar
 
Join Date: Feb 2008
Location: Fresno, California
Posts: 8,543
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 118 Post(s)
You are starving for fuel. Try adjusting the choke so it stays open and drizzling a little fuel or spraying carb cleaner down the carb throat when you feed it some throttle. If it runs on the prime, and picks up, you've got fuel delivery issues or a jammed up carb. Keep your hair and eyebrows out of the line of fire when you goose it, and keep a fire extinguisher handy. The reason it starts with choke but dies when you gas it is because it's very lean.
geeteeohguy is online now  
post #9 of 14 (permalink) Old 08-24-2015, 05:57 PM
 
Jared's Avatar
 
Join Date: Apr 2013
Location: Rehoboth, MA
Posts: 172
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Did you just install the Edelbrock carb or has it been on for a while and these issues are new? If you installed right out of the box, there are probably some adjustment issues. I had one on a Camaro and it ran awful as received. I pulled the top off and neither float was correct (one was too high, the other too low). Another easy check is that the metering rods, or the vacuum springs that hold them up are installed correctly (I had to change the springs as well since the factory ones allowed the rods to drop too early). You can access those right from the top without removing the carb, just don't drop anything in.

If your going to pull it to clean it, take the top off and see if anything is blocking the jets. These carbs are pretty simple compared to the Qjets or the Hollys.

Also, re-check the vacuums. Make sure there isn't one that has split or disconnected at the other end away from the carburetor.

Good luck!
Jared is offline  
post #10 of 14 (permalink) Old 09-05-2015, 01:39 PM Thread Starter
 
Join Date: Aug 2015
Location: Central Illinois
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Ok, everyone thanks again. I am back at it this weekend. I believe we have ruled out fuel as the car will start and will run fine. We have eliminated the vacuum as an issue. The issue is when the car is running the choke linkage is sticking. High Idle screw get stuck on the high idle cam and kills the engine.
Once the car dies, I can tap the accelerator and it will return to normal position but only when car off, when running it will not return to normal position.
mcarpani is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac GTO Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
1970 GTO dies when braking and around turns michaelrj9 1964-1974 Tempest, Lemans & GTO Exhaust, Suspension, Alignment, Fuel Tank and Brakes. 7 09-15-2014 08:16 AM
1 dies in crash involving GTO danfigg 2004-2006 GTO General Discussion 17 07-06-2011 06:24 PM
gto randomly dies after start up Bluegoat05 2004-2006 GTO General Discussion 0 03-21-2010 08:14 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome