Egine runs for 15 seconds then quits

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  #1  
Old 09-02-11, 02:39 AM
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Egine runs for 15 seconds then quits

I have a Husqvarna 55R21HV lawn mower with a Honda engine 3HNXS.1871AK I believe a 5hp. It will fire up for 15 seconds and then dies. I have fresh gas, I took the carb. off and inspected it very well. Still can't find the problem. Anyone have any trouble shooting suggestions! Thx
 
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  #2  
Old 09-02-11, 05:19 AM
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Does it repeatedly start and die - can you start it say five times in a short time with the same results or does it have to sit for an hour or so before it restarts?

Normally if it's a coil acting up they run longer, act up a little and die without restarting right away. Fuel issues do what you're describing. It can be a plugged vent in the gas tank cap or a restriction in the fuel line/filter or in the outlet of the tank itself or in other parts of the fuel system.

If you have a partial tank of fuel - say half a tank - it isn't likely the fuel cap since the air in the tank would allow the fuel to flow for longer than 15 seconds. If you have a tank completely full it could be a lugged cap vent.

Pull the inflow line from the carb and see if have a good consistent flow from the tank. If you have a fuel pump on the engine to pull from a tank sitting below the carb, spin the engine over to drive the pump. Either way you need fuel coming from the line.

If you have fuel in a good flow that leaves the carburetor. It will have to be removed, cleaned, preferably in a soak solution, although cleaning can be done with a good aerosol cleaner.
 
  #3  
Old 09-02-11, 09:49 AM
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Start with a new spark plug. Something about the NGK plugs that come in these things causes this. Might not be the problem, but it very well could be. Here is a thread about the problem: http://www.doityourself.com/forum/ou...tting-out.html
 
  #4  
Old 09-02-11, 10:17 AM
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Spark Plug it was!

Thanks Cheese. Spark plug it was! Thx everyone...........
 
  #5  
Old 09-02-11, 01:04 PM
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glad you figured out what it was. mine used to do the same thing! and you know what? it was the dag on spark plug too.
 
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