Flooding Out above 180 Degrees?? - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old May 24th, 04, 03:53 AM Thread Starter
Senior Tech
Join Date: Jan 2000
Location: Island Lake, IL
Posts: 203

Hello Everyone,

I have a ZZ502 in a 69 Camaro that has run more or less trouble free for the past three years. This season has started with a problem that I just cannot seem to isolate.

At water temperatures between 180 and 200 degrees, the engine seems to flood out and stall. It is very repeatable. I get a strong fuel smell out the tail pipes, but no black smoke. Sometimes I can feather the engine through it, other times the engine just dies. I have to wait until the engine cools down below 180 degrees before it will start and run smoothly again.

I have tried two different carbs (a BG 850 Vac Secondary, and a BG 850 Vac Secondary with annular discharge boosters). I have also tried two different coils, two different coil wires, and two different distributors (MSD). I have checked the fuel filter and float bowls for debris, and they were clean. The gas tank itself is brand new (3 years old). When I changed carbs, I changed spark plugs.

The one common thing between the two systems are the plug wires (MSD), but these are only a year old.

I cannot seam to find what is breaking down with temperature, or what would cause the flooding condition. Everything I can measure so far remains constant between running smooth and the stumbling/flooding condition.

When the engine starts to stumble, vacuum remains solid (idle vac. is 12), timing remains steady, voltage to the coil remains steady (12 13.5 volts), and fuel pressure remains steady (6 lbs.).

Any ideas? Has anyone had this problem before? I am running out of things to try.

Thanks and Regards!

'69 RS/SS Camaro 502/TH400/4.11 Best 12.10 @107mph
'69 Z/28 Clone 383/TH400/3.73 Done! 996 Points out of 1000 at MCACN 2009
'72 Chevelle 540/TH400/4.11 Best [email protected] 137mph - 11/07/10
awsm502 is offline  
Sponsored Links
post #2 of 2 (permalink) Old May 25th, 04, 06:04 AM
Super Moderator
Bess-68's rule
Everett#2390's Avatar
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,626
Thumbs up

I'd try an HEI distributor just for kicks.

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - maybe this year, 2019 ...
Everett#2390 is offline  
Sponsored Links

Quick Reply

Register Now

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

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


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

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