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Test that the temperature sending unit in the water system is working properly. When the engine is cold, the computer puts it in cold start mode. Once warmed the temp sensor tells the computer to stop sending excess fuel to the engine and taking the cold start mode to off position. If the sensor is faulty, it stays in cold start mode and keeps dumping excess fuel into the engine causing your situation. Like your running with the choke on after warm-up.
Have you done the annual maintnance on this unit? i suspect this is a high effiency gas furnace. The poping noise might be due to a dried out drain out tube from drying out . Is it like a gurgling? Checdk your venting if its clear, no birds, nest or rodents.Make sure all panel ,for blower are all tight, there are safety switches that would allow you to hear noises if any problem exists. Or/and, maybe air filters are dirty, and duck work or plenums or poping due to blocked ducts,Since this has just begun after being off all summer, i would check all the aboveIts has to be somethng relatively simple
Hello, Here is a trouble shooting guide for you and some details of how
to fix it based on your symptoms. Here is a link to go to and make sure
you jump around the site, it will tell you the fix based on your problem
off the trouble shooting table. Link is below , copy and paste in
browser. If this helped you, please rate it and some kind words are
nice. Thanks Mike
stop running it untill you get the chain fixed you will know when it breaks or slips as the motor will not run at all and will bend the valves this will require the motor to come apart and basicley be rebuilt -jeff
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