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

 
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post #1 of 2 (permalink) Old May 24th, 04, 03:53 AM Thread Starter
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Question

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!

Keith
'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
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post #2 of 2 (permalink) Old May 25th, 04, 06:04 AM
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I'd try an HEI distributor just for kicks.

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