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  #1  
Old 04-29-2012, 07:23 PM
PMDowns PMDowns is offline
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Default Engine missing and backfiring
My 1996 Cub model 2165 with a 16 HPVangard (B&S) engine will crank and run fine at low idle. When you give it gas the engine starts missing badly and backfiring. The problem is particularly bad when you put a load on the engine. It did this identical thing last year and the repair was an easy plug replacement. I went ahead and replaced the plugs again but this did not solve the problem. My thoughts are something in the ignition system. Any thoughts appreciated.
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Old 04-29-2012, 07:44 PM
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Matt G. Matt G. is offline
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Sounds like the carb needs cleaning to me. The main jet is probably at least partially plugged.
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Old 04-29-2012, 08:24 PM
Merk Merk is offline
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Does your engine have Champion sparkplugs in it?
I would replaced the spark plugs with a set of Autolite plugs.
Pull the plugs and look at them. One may be gas fouled.

Another area is the air filter. When was it last change? Is the filter a Briggs and Straton filter? The material Briggs uses in their filters may look ok. They will plug and cause the power loss like you are expenencing. A good way to tell is to run your Van Guard engine without the air filter.

I have a 16 HP Briggs Van Guard that did the same thing. My Briggs will foul a Champion sparkplug out every 10 to 20 hours. Never the same cylinder. My Briggs has a coil for each cylinder.
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Old 04-29-2012, 11:40 PM
PMDowns PMDowns is offline
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Thanks to both of you for your ideas. I was using Champion spark plugs and as I mentioned I did replace them and that didn't solve the problem. I also ran the engine without the air filter and it had no effect either. I will try cleaning the carburator and see if that helps. It may take me a day or so but as soon as I do I will post the results. Thanks again.
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Old 04-30-2012, 09:28 PM
PMDowns PMDowns is offline
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Default Apparently fixed but new question
I cleaned the carb as well as putting fresh gas in the tank and the missing and backfiring problem seems to have gone away. However after taking off the air cleaner assembly I noticed a hose barb on the rear of the carb with a piece of broken rubber hose attached to it. Despite much searching I cannot determine where this hose is supposed to go. I have attached a picture. You can see the L shaped hose barb on the right side of the carb.
Thanks again for any assistance.
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  #6  
Old 05-01-2012, 08:29 AM
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ol'George ol'George is offline
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Quote:
Originally Posted by PMDowns View Post
I cleaned the carb as well as putting fresh gas in the tank and the missing and backfiring problem seems to have gone away. However after taking off the air cleaner assembly I noticed a hose barb on the rear of the carb with a piece of broken rubber hose attached to it. Despite much searching I cannot determine where this hose is supposed to go. I have attached a picture. You can see the L shaped hose barb on the right side of the carb.
Thanks again for any assistance.
I'm sure others will reply that are familiar with this engine, but to me it appears it is a bowl vent to atmosphere, with newer emission standards I would say it goes to the air cleaner, unless you have a "carbon canister"
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