britandy
Member
- Aug 19, 2019
- 39
- Boat Info
- 340 Sundancer 2000
- Engines
- Mercrusier 7.4 MPI, inboard, V drives
I am hoping someone who has first hand knowledge of setting base timing on a MEFI 3, 7.4 MPI engine can answer a couple of questions. I know what the procedure is and I tried it last weekend, but suspect it did not work as it should.
1. When I shorted the A and B pins together I did not notice any change in engine RPM, and also no change when I disconnected them. From what I have found on line and on Club Sea Ray is when in service mode the ECU will control the engine rpm raising it to around 1000 rpm. What is meant to happen when shorting the pins?
2. If the ECU is truly in service mode I assume I should not have to move the throttle during the procedure, in fact the throttle should be fully closed?
I wonder if the pin in the diagnostic connecter that is meant to be connected to ground on my boat is not.
I plan on messing with it again this weekend but at least wanted to know what other people have experienced.
Thanks, Andy
1. When I shorted the A and B pins together I did not notice any change in engine RPM, and also no change when I disconnected them. From what I have found on line and on Club Sea Ray is when in service mode the ECU will control the engine rpm raising it to around 1000 rpm. What is meant to happen when shorting the pins?
2. If the ECU is truly in service mode I assume I should not have to move the throttle during the procedure, in fact the throttle should be fully closed?
I wonder if the pin in the diagnostic connecter that is meant to be connected to ground on my boat is not.
I plan on messing with it again this weekend but at least wanted to know what other people have experienced.
Thanks, Andy