Start then Stop

Category: 912iS Technical Questions 4 weeks ago

Lately, on the first start of the day, my iS will start and run for 1-2 seconds then stop.  It always starts and runs on the 2nd attempt although it will drop in RPMs a few times before it begins to run smooth.  Any idea on what might be causing this?  It's never done this before.

  • Re: Start then Stop

    by » 4 weeks ago


    I once had that problem. Turned out I hade introduced air into the fuel system by taking a fuel sample from the gascolator with the fuel selector in the off position. I cracked the fuel line fitting at the hose to fuel rail junction and bled the air off . The gascolator on my aircraft is just before the coarse filter. Fuel line then goes to the fuel pumps. So I assume I had created an air lock in the fuel pumps. Had I ran the pumps longer before attempting a start the situation may have resolved its self.


  • Re: Start then Stop

    by » 3 weeks ago


    Richard Boslaugh wrote:

    I once had that problem. Turned out I hade introduced air into the fuel system by taking a fuel sample from the gascolator with the fuel selector in the off position. I cracked the fuel line fitting at the hose to fuel rail junction and bled the air off . The gascolator on my aircraft is just before the coarse filter. Fuel line then goes to the fuel pumps. So I assume I had created an air lock in the fuel pumps. Had I ran the pumps longer before attempting a start the situation may have resolved its self.

    I don't think that is my issue - I have never put the fuel selector in the off position. 

    Anyone else have a suggestion?


  • Re: Start then Stop

    by » 3 weeks ago


    You should check your fuel lines mainly the lines before the fuel pumps for any restriction or clogged filter.

     


  • Re: Start then Stop

    by » 3 weeks ago


    Spoke to Lockwood today.  They said it usually has to do with system voltage.  I plan to install a new battery this week.  I'll post the results here.


  • Re: Start then Stop

    by » 2 weeks ago


    The new battery did not solve the problem.  I currently have a 14 amp battery and it has been suggested that I upgrade to a 18 amp or a lithium battery.  Thoughts on this?


You do not have permissions to reply to this topic.