912ULS RPM Drop on "A"
Hello, Folks-
First, I've used the search function on the fourum (with great success). I've already followed much of the advice that I've read, and thank everyone for their contributions!
The problem is a greater RPM drop on "A": 250 rpm drop on "A" vs the (normal) 150 rpm drop on "B". Here is what I've done for troubleshooting thus far:
1. I replaced all spark plugs with new. This is the 2nd new set in 10 hours.
2. Swapped modules. Problem remained on "A".
3. Rang wiring between ignition modules and coils
4. Rang ignition wires across the coils. All rang good.
5. Removed spark plug connectors connectors anyway, trimmed 1cm from each wire, reinstalled spark plug connectors.
This behaves like one plug not firing. I've not had any available help to troubleshoot, so I haven't been able to identify which spark plug is the culprit. I'd welcome suggestions for the best method to do this - solo.
This engine has 156hrs total since new. Could one loose or mis-adjusted firing coil at the flywheel cause this problem? I felt each one for security (they all seem tight) but I haven't yet checked the gap.
I appreciate any and all suggestions!
Jerry Allison
2016 RV-12
X39 - Lutz, FL
