snow blower runs fine for 80% of driveway then needs partial choke to stay running - Snowblower Forum : Snow Blower Forums
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post #1 of 21 Old 01-18-2020, 07:14 PM Thread Starter
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snow blower runs fine for 80% of driveway then needs partial choke to stay running

I have a 4/5 year old troybilt storm 2410
Have fresh gas from 2 days ago. Have always treated gas with seafoam

Normally I start the snow blower on full choke, let it sit for a few minutes while I shovel some steps. Return to snowblower and turn the choke off completely. I can plow 80-90% of my 120ft driveway with the choke fully off, then the engine will start to sputter/stall. If I turn the choke partially on (10-20% choked) it will run smoothly, or is able to be restarted easily

Once I encounter the issue I have to run partially choked if the engine is warm (finish my driveway, turn off blower, go help a neighbor 20/30 minutes later) But the next time it snows (cold start) I will be able to run with the choke fully off again

this issue has been present most of this season
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post #2 of 21 Old 01-18-2020, 07:26 PM
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Quote:
Originally Posted by mehmehmeh View Post
I have a 4/5 year old troybilt storm 2410
Have fresh gas from 2 days ago. Have always treated gas with seafoam

Normally I start the snow blower on full choke, let it sit for a few minutes while I shovel some steps. Return to snowblower and turn the choke off completely. I can plow 80-90% of my 120ft driveway with the choke fully off, then the engine will start to sputter/stall. If I turn the choke partially on (10-20% choked) it will run smoothly, or is able to be restarted easily

Once I encounter the issue I have to run partially choked if the engine is warm (finish my driveway, turn off blower, go help a neighbor 20/30 minutes later) But the next time it snows (cold start) I will be able to run with the choke fully off again

this issue has been present most of this season
so when it is thoroughly warmed up and used it starts doing this. this should be interesting. usually this means running lean , needing more fuel , and or a slight clog in carburetor but this is something new here.

about how long does it run before this issue? perhaps a partially clogged vent on gas cap if lucky.

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post #3 of 21 Old 01-18-2020, 07:28 PM
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Welcome to the forum!

Needing partial choke typically indicates a dirty carb. But yours starts out OK, so that doesn't seem consistent with your symptoms.

Does it lose power when this is happening? Does it ever backfire, or does the muffler glow? You might have a valve that needs to be adjusted. If your valve clearances are too-small, the valve won't close fully as the engine heats up. You'll lose compression and power.

After it gets hot and needs partial choke, if you shut it down and immediately re-start it, is the cord easier to pull than when the engine is cold?

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post #4 of 21 Old 01-18-2020, 07:31 PM
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Quote:
Originally Posted by orangputeh View Post
about how long does it run before this issue? perhaps a partially clogged vent on gas cap if lucky.
Good point. Try unscrewing the gas cap a little (or just remove it fully and then loosely re-install it, to make sure you've vented the air), and see if that helps, once the problem starts.

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post #5 of 21 Old 01-18-2020, 07:40 PM
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Quote:
Originally Posted by mehmehmeh View Post
I have a 4/5 year old troybilt storm 2410
Have fresh gas from 2 days ago. Have always treated gas with seafoam

Normally I start the snow blower on full choke, let it sit for a few minutes while I shovel some steps. Return to snowblower and turn the choke off completely. I can plow 80-90% of my 120ft driveway with the choke fully off, then the engine will start to sputter/stall. If I turn the choke partially on (10-20% choked) it will run smoothly, or is able to be restarted easily

Once I encounter the issue I have to run partially choked if the engine is warm (finish my driveway, turn off blower, go help a neighbor 20/30 minutes later) But the next time it snows (cold start) I will be able to run with the choke fully off again

this issue has been present most of this season

Choke should not be left on for minutes 30 seconds 45 seconds tops
it was 15 this am started blower full throttle full choke 20 seconds choke off 15 more seconds to idle 1750 rpm 1 min later warmed up to top idle 2050 rpm
new blowers are set lean some need choke
could have junk in the carb
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post #6 of 21 Old 01-18-2020, 07:57 PM Thread Starter
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it seems like I can get ~30 minutes out of it from a dead cold start. so if there was not much snow and I can go at higher speeds, I won't encounter the issue, and I can finish my whole driveway without adjusting the choke.

When I do encounter the issue, the engine start running rougher/slower until I partly choke it. I will hear the rpm drop and I can prevent it from fully stalling by adjusting the choke. Muffler does not seem overly hot (no glow), it has not been backfiring. I can always easily restart the blower (just can never go choke fully closed for the rest of that session)

don't think it is the fuel vent since the problem seems to go away after letting the engine cool completely/ waiting for the next snow fall. I usually check the gas level when the issue pops up because the symptoms are similar to running out of gas (sputtering and stalling out)
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post #7 of 21 Old 01-18-2020, 08:17 PM
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Letting the engine cool would also give time for a slowly-venting gas cap to finish venting properly. But if you remove the gas cap when the problem happens, and the problem continues, then it's not related to a clogged cap, unfortunately.

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post #8 of 21 Old 01-18-2020, 08:23 PM
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Quote:
Originally Posted by 1132le View Post
Choke should not be left on for minutes 30 seconds 45 seconds tops
it was 15 this am started blower full throttle full choke 20 seconds choke off 15 more seconds to idle 1750 rpm 1 min later warmed up to top idle 2050 rpm
new blowers are set lean some need choke
could have junk in the carb

It could be a whole host of things but per above, 20 seconds and you should be able to go to half choke and no more than a couple of minutes off (if not sooner)
You are compensating for a problem, said problem then comes back when it gets hot enough.

You might try sans the sea foam. Its a long term preservative and not needed for the winter (I have mixed feeling about it even as a preservative but gasoline going bad is not an AK issue)


I don't think this is the answer but worth considering for all machines.

My intake is close to the left side and light and deep snow will ice it up.

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Last edited by RC20; 01-18-2020 at 08:27 PM.
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post #9 of 21 Old 01-18-2020, 11:57 PM
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Seems like that much time and engine heat, he might have tight valve clearance causing a problem.
After the engine is shut down and cools for a while it runs ok again, that is what usually happens with tight valves, especially if everything else checks out ok.
A possibility he might want to check into.
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post #10 of 21 Old 01-19-2020, 03:40 AM
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Not sure about tight valves as he says easy to restart. Tight valves make for hard starting.


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