enticer 340 0 #1 Posted 2 hours ago ive noticed a weird noise on my toro, it sounds like a knock. but i read on the forums it might be a valve noise. would anybody know which one it is? 494e0ddb-4cba-4ac5-976b-b93ea7f25713.mp4 Share this post Link to post Share on other sites
Ed Kennell 43,327 #2 Posted 2 hours ago to the All I can hear is a badly surging engine. Remove one spark plug at a time to determine if there is a problem in one of the cylinders. Share this post Link to post Share on other sites
lynnmor 8,144 #4 Posted 2 hours ago If you throttle up you should be able to keep the engine running on one cylinder. See if the sound changes when you do that. Next step would be a compression test, it might show which cylinder is the problem but it may not prove that there is a valve seat issue. Surging is usually caused by an intake air leak or a dirty carburetor. Share this post Link to post Share on other sites
