pop/flame from carb???
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pop/flame from carb???
I have a 1986 with a 351 and a 4bbl. When I rev the engine by flooring it real quick it sometimes pops a flame out of the carburator, hesitates for a second then continues to rev higher. I was wondering if this sounds like the timing is off, it has major engine problems, needs the carb rebuilt or some combination of the three. When I ease into the throttle until it's floored it doesn't seem to backfire through the carb like that. It's got 160k on the engine.
Senior User
Joined: Dec 2004
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From: Edmonton, Alberta
I'd try the timing first. Then the carb adjustment followed by a rebuild if it won't clear up. Lastly, check the valve lash. Major engine problems usually announce themselves with grinding and holes punched through the block... lol
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New User
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Yeah I think the timing is going to be it, but the carb probably could use a rebuild. As far as valve lash, I don't even know what that is or how to check it. I think if the timing/carb rebuild doesn't do it I'm going to give up! I'm only working with meager tools in my apt complex parking lot on a $950 bronco.
thanks for the help!
thanks for the help!
Senior User
Joined: Dec 2004
Posts: 460
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From: Edmonton, Alberta
All you need for valve lash is a $5 set of feeler gauges, a 1/2" or 9/16" wrench (I think its that size), a flat bladed screwdriver, a new set of valve cover gaskets and an upper plenum gasket.
Personally, I think if you are adventuresome/experienced enough to try a carb rebuild, that setting the valve lash is not going to be a problem for you. The complete instructions are in the Haynes manual and it should only take a couple hours one afternoon. But, valve lash is only a slight possibility for the problems you are describing.
Personally, I think if you are adventuresome/experienced enough to try a carb rebuild, that setting the valve lash is not going to be a problem for you. The complete instructions are in the Haynes manual and it should only take a couple hours one afternoon. But, valve lash is only a slight possibility for the problems you are describing.
