adverseyaw

IO-360 misfires at idle and low MP

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1 hour ago, jetdriven said:

replace the intake gaskets. you cant accurately determine if they are leaking in place, and it can be a huge leak. use permatex aviation sealer on them. 

That's a good idea. We pressurized the intake already and it held pretty well. Would the gaskets still be likely even if we've preformed this test?

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10 hours ago, adverseyaw said:

That's a good idea. We pressurized the intake already and it held pretty well. Would the gaskets still be likely even if we've preformed this test?

Yes. I suspected  a vacuum leak and I messed with it for a year. pressurized the intake.  sprayed soapy water. ran the engine and sprayed carb cleaner on the intake flanges. norhing. then once i had to remove both copilot side intake tubes for unrelated maintenance.  when i started it up to check the work out, pulling the throttle to idle smooth killed it. I mean I had to bump the throttle 1/8" to keep it running.  Ended up I had to turn the idle stop screw in about a full turn which is a lot. We accidentally fixed that big of a vacuum leak.

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