1978 Ford F-250 Cylinder Flooding

FORD F-250
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MTNBOY
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  • 1 POST
I have a 78 F-250 with a 400M completly rebuilt about 15k ago. My # 5 cylinder is flooding With all plugs removed # 5 blows out gas, it has the Edelbrock carb/manifold on it. It just started running rough while driving. Any help?
Mar 3, 2007 at 5:06 AM
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CHEVY22
  • ✓Experienced Mechanic
  • 1,375 POSTS
if you have gas flooding in one cyl only , with the plugs out and it still does it , you may have a stuck or damaged intake valve , valve guide ,valve seat , valve spring you could pop the valve cover and see if it is stuck open

thanks
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Mar 3, 2007 at 5:25 AM

Suggested Repair

Inspect cylinder 5 for a stuck or damaged intake valve. Remove the valve cover and check whether the valve is stuck open, and inspect the valve guide, seat, and spring.

Conversation Summary

The owner of a 1978 Ford F-250 with a rebuilt 400 engine reports that cylinder 5 is flooding and blowing fuel with the plugs removed after the truck began running rough. An expert says flooding in only one cylinder may indicate a stuck or damaged intake valve, guide, seat, or spring, and suggests removing the valve cover to check whether the valve is stuck open.

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