dead cylinder when cold

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dead cylinder when cold

Postby shyntempt » Sat Sep 10, 2016 6:45 am

My cub has had different cold performance the last month or so. When you start her cold, she runs on 3 cylinders for 45 seconds to a minute. After that the fourth cylinder fires up and she runs perfect the rest of the day. Haven't investigated anything yet cause she's busy with the sickle mower. Suggestions?


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Re: dead cylinder when cold

Postby Shane Nelson » Sat Sep 10, 2016 8:29 am

More than likely a fouled plug.
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Re: dead cylinder when cold

Postby Eugene » Sat Sep 10, 2016 8:32 am

First thought, ignition related; spark plug, plug wire, distributor cap.

Bad news, the problem is it's going to be very hard to determine the cause because of the short fault time, 45 to 60 seconds. Good news, when the problem becomes permanent, the cause will easily be determined.
I have an excuse. CRS.

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Re: dead cylinder when cold

Postby Don McCombs » Sat Sep 10, 2016 8:51 am

I'm going to be the odd man out here, thinking it's a stuck intake valve. Run some Seafoam in the fuel and crankcase, according to the can instructions, for the balance of the mowing season.
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Re: dead cylinder when cold

Postby John *.?-!.* cub owner » Sat Sep 10, 2016 9:37 am

Most likely it is a bad or dirty spark plug, though if not, Don, probably has it with a sticky valve. If so you get get a basic check by spinning it over a few times with the starter while the ignition is off, then turning it over a few times with the crank. You should feel good compression 2 times per round, taking 2 rounds to feel compression on all 4 cylinders. If one cylinder is low or no compression there is a good possibility a half can of Sea Foam in the gas, and other half in the crankcase and work it hard for a couple hours will cure the problem. Once this is done I recommend changing the oil to get the sea Foam out of the crankcase. That oil change may be necessary, but I prefer it to leaving the Sea Foam in the oil.
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Re: dead cylinder when cold

Postby ctltmp » Sat Sep 10, 2016 6:03 pm

My first guess would have been in agreement with Don's odd man out, valve sticking open. I'm fairly new so I figured I'd wait for the experts to weigh in.

Pull the plug and check the condition. Rarely happens but a plug can go bad. If it's not that then most probably a valve get stuck open until it warms up a bit.
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