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Old 06-18-2017, 03:44 PM
terry.mortimore terry.mortimore is offline
Join Date: Jul 2008
Location: Sault Ste Marie, Ontario Canada
Posts: 210
Default EFII map fluctuations

The map source is on the aluminum adapter plate between the throttle body and the intake manifold.

I had that apart today and did not notice the .020 orifice. There is a reduction in the aluminum plate, but it was larger than the .042 safety wire I stuck in there to check for obstructions.

I was reading the SDS manual and they suggested a .025 to .035 restrictor to dampen the MAP fluctuations. I installed a .030 restrictor in the line today and it calmed things down quite a bit. If I should have a .020 orifice that might settle it down completely. I'll try that tomorrow.

I still don't understand why the fuel map requirements would change from day to day, but I'll keep working on it.

The next time I notice this I will try running on the secondary fuel injection and or switch the plugs on the two MAP sensors.

The other thing I wonder about is that I have the Dynon map sensor tee'd into this same line, could that be an issue?

Thanks for the help, terry.
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