Bolter Posted March 14 Report Posted March 14 On 3/14/2025 at 11:08 PM, Pnwflyer said: Hi! Any good outcome of this issue a while ago? Kind of struggling with same issue on IO550D. After start, acts like it’s going to idle and then starts to die. If I catch it with elect fuel pump, it will stay alive. Have to do this for a few mins then it idles fine. But, when taxiing, adding power gives a pretty good hesitation and it has another go at trying to quit. Once it’s warmed up, it only hesitates when going from idle to about 1200-1500 for taxi. Amazingly, there is no hesitation or preponderance of trying to quit at all while airborne and at idle. Just wondering what you found out anything. full disclosure here: this engine is on a c185….i just saw you had a similar issue with a 550 and wanted to pick your brain! Thanks! Expand Fellow PNW flyer here. My personal experience was traced to fuel pump and divider wear from age, and leaking internally. Replacing these parts AND proper system tuning, fixed it all. You already confirmed good plugs and igntion wires, I assume. Quote
Mufflerbearing Posted March 16 Author Report Posted March 16 On 3/14/2025 at 11:08 PM, Pnwflyer said: Hi! Any good outcome of this issue a while ago? Kind of struggling with same issue on IO550D. After start, acts like it’s going to idle and then starts to die. If I catch it with elect fuel pump, it will stay alive. Have to do this for a few mins then it idles fine. But, when taxiing, adding power gives a pretty good hesitation and it has another go at trying to quit. Once it’s warmed up, it only hesitates when going from idle to about 1200-1500 for taxi. Amazingly, there is no hesitation or preponderance of trying to quit at all while airborne and at idle. Just wondering what you found out anything. full disclosure here: this engine is on a c185….i just saw you had a similar issue with a 550 and wanted to pick your brain! Thanks! Expand Yes, the challenge has been sorted. The biggest and first thing I did was install fine wires top and bottom. 10/12 Champion spark plugs failed the ohm test. Then I did have the fuel pump replaced and then what I later learned the importance of having the mechanical fuel injection system tuned annually. With all of these things, the plane runs perfectly. 1 Quote
cleatus99 Posted Sunday at 05:34 AM Report Posted Sunday at 05:34 AM Same Problem…. just started, nothing changed. IO-550-A will not idle below 1000 RPM, all the way to the stop… Engine starts, starts to die takes a brief press of boost pump to keep it running… Runs rough below 1100 RPM… Quote
Mufflerbearing Posted Wednesday at 07:20 PM Author Report Posted Wednesday at 07:20 PM On 4/13/2025 at 5:34 AM, cleatus99 said: Same Problem…. just started, nothing changed. IO-550-A will not idle below 1000 RPM, all the way to the stop… Engine starts, starts to die takes a brief press of boost pump to keep it running… Runs rough below 1100 RPM… Expand Your fuel injection system needs to be tuned badly by an A&P that knows how to do it or can reasonably follow the instructions to make it work. Once one part is tuned, it whacks another part so it is a constant back and forth until it's perfect. Mine will now idle correctly at 600 rpm. 3 Quote
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