Poulan Pro Snow thrower backfires - Snowblower Forum : Snow Blower Forums
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post #1 of 12 Old 02-07-2015, 05:50 PM Thread Starter
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Poulan Pro Snow thrower backfires

Hi

I have a snow thrower (poulan pro pr 521) which I have been using fine until today. Today unfortunately while cleaning the snow I left the valve on Start position. I continue cleaning the snow until I realized that I am not getting enough power and black flames have started to come out. Then I realized that my snow thrower is in Start position and not in Run. I changed it to Run position. It ran fine for a minute and it then stopped.

I tried starting it again. It will start every three pull (vs 1 pull before this) and then it will backfire and make loud bang noise... As soon I put it in Run and try to engage, it will stop. It will start again after 3-4 pull but the same thing will happen.

Any suggestions will be really helpful.

Thank you

Sean
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post #2 of 12 Old 02-07-2015, 06:00 PM
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That's because the exhaust valve is seizing a bit. My suggestion is to start it and let it run at high idle for 5 minutes and hope it will clean itself out.


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post #3 of 12 Old 02-07-2015, 06:11 PM Thread Starter
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Originally Posted by Coby7 View Post
That's because the exhaust valve is seizing a bit. My suggestion is to start it and let it run at high idle for 5 minutes and hope it will clean itself out.
Thank you Coby. Just so I understand correctly (I am a noob when it comes to these things) I should put machine in Start position and Start the machine and let it run or after start move it to Run position and let it run and if it makes noise or afterfires then let it do it.
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post #4 of 12 Old 02-07-2015, 06:18 PM
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Start mode is to start. As soon as it is started switch to run mode and let it run at full throttle for 5 minutes. This should clear all the carbon build up on the exhaust valve caused by your OOPS!.


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post #5 of 12 Old 02-07-2015, 06:21 PM Thread Starter
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Originally Posted by Coby7 View Post
Start mode is to start. As soon as it is started switch to run mode and let it run at full throttle for 5 minutes. This should clear all the carbon build up on the exhaust valve caused by your OOPS!.
Thank you Coby. I will give this a try and update this thread tomorrow.
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post #6 of 12 Old 02-07-2015, 07:09 PM
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if you know how to check the spark plug take a look at it
it might be fouled

current machines
1-toro2450E-38419. 1-toro3000E-38435. 1-toro 3650E-38445
2-toro 521E-38052. 1-toro xl824pt 38086
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post #7 of 12 Old 02-07-2015, 07:28 PM Thread Starter
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if you know how to check the spark plug take a look at it
it might be fouled
That is a good point ... Before start of the season I somehow figured out how to change the spark plug... ..

If the above does not help then I might as well change the spark plug .. I have one sitting extra...
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post #8 of 12 Old 02-08-2015, 09:32 AM Thread Starter
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OK. So I tried to start the thrower this morning but it would not even start. I can smell the gas now but its not starting. So as a next step I am going to change the spark plug.

Any other suggestions?
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post #9 of 12 Old 02-10-2015, 02:05 PM Thread Starter
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OK. Just to update the thread. Today I changed the spark plug and BOOM.. One pull start and everything seems normal ... Thank you both Coby and William for providing valuable inputs..
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post #10 of 12 Old 02-10-2015, 04:52 PM
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It might be a good idea to let it warm up a bit and not use it right away until you have taken the choke off and it's ready to go in the "run" position.

.
Make sure the windows are up before the snow plow goes by !!

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