![]() ![]() Really the proper way to "fix" them is to replace the throttle body, but it's real expensive and sometimes people don't want to (or can't) fork over almost $800 (current price) for a new one, and that's entirely understandable, IMO. When the intake valves tighten up (which is normal), the intake pressure kind of pulses abnormally, and the ECU picks it up and tries to adjust, but the engine doesn't react nearly as quickly as the ECU wants it to, so it idles poorly, runs poorly at all speeds (especially low speeds part throttle). When that happens, replace the throttle body assembly. In extreme cases, the throttle sensors get so fouled up that the ECU senses faults and shuts the spark off to the front cylinder. So the most common complaint ends up being "won't idle". So they keep building up (in the mule applications) until the oil level is so high that it pukes the oil mixture back up through the PCV system and into the air intake, which then fouls the throttle plates (there are two on the 4010 Mules, one on most all of the rest of them), fouls the intake pressure sensor, the intake air temp sensor, and everything else from the air filter to the pistons. If the engine oil can't get up to about 180° or above for any length of time, it can't boil those byproducts off. ![]() Some of that mixture naturally and normally enters the crankcase through the rings. The engine (no engine) is completely efficient in burning ALL of the fuel/air mixture that enters the cylinder(s). In the Mule application, the engine oil never gets hot because they idle and putt around their entire lives, thousands of hours. Well in those instances, the engine oil gets hot and stays hot. #Trouble shoot prizmo 4010 fullWhat do we know about those? They run full throttle, full load, and 3500 RPM all the time. Industrial engines are, well, generator, lawn mower engines. Why? The engine was originally an industrial engine. The oil level rises by itself if they're used at low speeds and idling a lot (which is 95% of the Mules). It in itself can cause idling issues among other things. Most common cause is too much oil in crankcase. Yup common issue and it's causes are multi-faceted. ![]()
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