Viking 110 ECU start problem

2 week ago engine started fine on ECU 1 -RPMs good, Fuel pressure good, fuel flow high

Yesterday engine would not start on ECU 1,  engine cranked fine, tried to start but would not.

Today engine would not start on ECU 1 but started fine on ECU 2.  All engine parameters normal.  switched to ECU 1 and

engine ran but no RPMs, switched ECUs off and engine ran fine. Shut down after taxi tests by turning off the high pressure

fuel pump.

 

What would cause the malfunction of the ECU 1 and how do I correct the problem.  I could renumber the ECUs, and operate

okay, but that just ain't right.

Any help would be appreciated.

Glenn Miller

You need to be a member of Viking Aircraft Engine Forum to add comments!

Join Viking Aircraft Engine Forum

Email me when people reply –

Replies

  • Hi Glenn
    First step is to update the wiring to the latest diagram on the website.

    Basically

    - Each fuel pump is wired separately
    - The ECU select wires are required to permanently operate ECU 1 only by soldering “ECU1” wire to “ECU Select” wire and discarding “ECU 2” wire.
    - wire alternator to separate switch


    Your issue right now seem to come from an overly complex wiring system and the ECU select switch wires being intermittent
    • I will install a switch to the alternator. Check the ECU wiring. I notice there is no capacitor on the latest wiring diagram. Should I disconnect the capacitor?

      Thanks for the helpful info, Glenn Miller
    • The capacitor is only there for it to run on the alternator without a battery in the circuit.
  • Glenn, I updated my ECU software on my 110 and updated the wiring as Jan suggested about a year ago. Since then the engine starts better than it every has and I have had none of the "glitches" with the double ECU system.
    • Thanks for the reply. I will redo the wiring.

      Glenn Miller
    • I still have my capacitor and don't see it as part of the issue.
    • Now that I think more about the capacitor, it seems that it will still allow the engine to run if the batteries fail. The alternator shut off switch could then shut off the engine at normal shut down or an emergency shut down. Apparently the ECU is no longer checked monthly. Is that correct? I will have to rewrite the POH.
    • The recommendation is to solder ECU select wire to ECU 1 wire and discard the ECU 2 wire and ECU select switch all together.
    • Thank you for the clarification. I just wanted to make sure.
This reply was deleted.

Activity

Bruce Flatt, Warren Longden and Gene Odosij joined Viking Aircraft Engine Forum
Nov 9
Glenn Davis posted a photo
Nov 1
Glenn Davis updated their profile photo
Oct 18
Dick gossen left a comment on Recent Activity - Add Comments, Videos and Pictures Below
"Hi all, Anyone interested in a Sensenich 2-blade prop for the Viking 110? I've got one and a 13" spinner to go with it.
Dick Gossen
gossend@gmail.com"
Oct 17
Glenn Davis posted a photo
Oct 16
bob noffs posted a discussion
hi all, is the proper fuel for the 110 still min. 90 octane. no ethanol preferable but ok. last choice is avgas 100 low lead. thanks, bob noffs
Oct 11
Travis Christensen is now a member of Viking Aircraft Engine Forum
Oct 9
bob noffs replied to bob noffs's discussion pitch for propeller
"thanks norm, i will probably start with 18."
Oct 9
Norm Neuls replied to bob noffs's discussion pitch for propeller
"Bob, on my CH-750 I have it set at 19 degrees which gives me about 5200 on takeoff and climb. I previously had it at 18 and as I recall it was around 5400."
Oct 8
Glenn Davis updated their profile photo
Oct 7
bob noffs posted a discussion
hi all, i have the 110 in an rv-12. can anyone recommend  an initial pitch setting for the whirlwind 3 blade 70'' prop?thanks, bob noffs
Oct 1
Dick gossen posted a photo
The Viking 110 in my RV-12 "Tweety Bird". Put 400 hours on her in two years! Long cross-country trips greater than 1000 miles (each) totaled 14000 miles!. Sweet!
Sep 30
  • Dick gossen By the way, that cowling is for sale: $200. You can have the spinner and backplate to match - I have both a two-blade and three-blade version: $50 each. and you can have my Sensenich two-blade carbon prop for $500! 408 499 8587
    Oct 28
Viking Aircraft Engines replied to bob noffs's discussion viking 110 muffler
"M18x1.5 -Alissa"
Sep 29
bob noffs posted a discussion
hi all, can anyone tell me the thread type and size of the bung in the side of the muffler. i think it was meant for an o2 sensor? thanks bob noffs
Sep 29
Larry Zepp left a comment on Recent Activity - Add Comments, Videos and Pictures Below
"Blast cooled housing for Dual Earth-X batteries on the engine side of the firewall."
Sep 28
Larry Zepp left a comment on Recent Activity - Add Comments, Videos and Pictures Below
"Installation of the dual check valves and Viking 110 fuel pressure regulator on the Zenith Zodiac 650B firewall - Before installation of fuel injection hose and fire sleeve.
 "
Sep 28
More…