What causes my lawnmower engine to surge when hot?
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My 14 month old lawnmower surges and eventually quits running when hot. I called Toro & the factory service center said they can’t work on it for 5 weeks! I’m supposed to try to fix it by myself!
I’m going to clean the spark plug today and either drain & replace the gas or put additive in it. What else should I do?
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THese simple things you can check fix yourself. clogged fuel filter(replace),spark plug(s) need cleaned,bad/old gas causing carbeurator to gunk up(do you drain when in storage;water/grass/dirt/dust in it;carburetor needs to be cleaned out, a can of carbeurator cleaner spray(auto parts stores) can dissolve the crud out and restore operation. 90% of this problem is caused by old contaminated gas. ),check muffler---it quits running as a safety precaution so it won't destroy the engine.
Google the model and serial number.
https://www.hunker.com/12363720/how-to-troubleshoot-surging-lawn-mower-engines
https://homeguides.sfgate.com/lawn-mower-sound-like-surging-96483.html
Hi, Cheryl!
Seafoam is an additive that helps remove gunk and such from engines. I use it in my car and my mower before changing the fuel filter. I hope this helps!
Check oil .
Thanks everyone.
Gas wasn’t old. Ran it dry last Fall. New gas can.
Oil was clean & full. Air filter new.
No fuel filter.
SOLUTION: Siphoned out all gas, Cleaned spark plug with 70% isopropyl alcohol, put Sea Foam in fresh gas.
Didn’t install the new in-line fuel filter I bought before I said, Why not try it and see?
SOURCE OF PROBLEM: sheeting rain storms. Even though it was under a 6’ deep porch, sideways rain storms got water in the carburetor.
PREVENTION: 30 bushel galvanized bucket upside down over the top of the mower when parked.