EIS noise
 

I bought a IO-360-A3B6D specifically to have an electronic ignition. We put an Electroair system on it. It has so much radio noise it is annoying. All the grounds are on the same point on both sides of the firewall and the engine is grounded to the same spot. Any ideas would be appreciated. Thanks, Doug

Did you buy the Electroair kit and use their spark plug wire?


http://www.electroair.net/faqs.html

Can I re-use my aircraft spark plug harness with the EIS?
No, you can not use a copper wire, or solid core harness. You have to use a noise suppression (a.k.a. resistive) spark plug wire in order to prevent unwanted RF noise from damaging the controller. Electroair supplies the appropriate harness wire with attaching hardware to complete your installation.

I purchased thier kit and used every thing in it including thier wires. I am aware of thier requirement to use thier supplied harness. Thier instructions also require that the wires be seperated by a certain amount so I bought some wire seperators from a hot rod supplier. I thought it would run better if I ran the EIS on the bottom plugs and the mag on the top. I am using REM37BY plugs set to the recomended gap. Thanks

EIS to top plugs
 

Klaus once told me it's best to run the EIS to all 4 top plugs and mag to bottom plugs. I think the reasoning is to avoid oil fouling of the EIS plugs, since they usually will be firing first.

Noise
 

Quite possibly could be your alternator. Have you checked that?

My self reasoning was that the EIS plugs run hotter and woulndnt fowl as quickly?

Turnig off the alternator didnt effect it

Just got a call from Electroair and he suggested that the power wire was too close to an antenna coaxial. Or that the plug end of a wire might be defective. (Tail poking out the side or defective plug.) Well I happen to know that an antenna coaxial on the inside of the cockpit is going thru the same mounting hole as the EIS power wire with about a half inch seperation. It gives me somthing to look for.

I suggest you pull the bnc connector off the radio and run the engine first. That will tell you if EMI is radiated thru the coax shield of the antenna lead.

thanks, never thought of that.