face89
New Member
- Aug 4, 2009
- 13
- Boat Info
- 380 Sundancer 2000
- Engines
- 454 Mercruiser Mag MPI Horizon Gen VI Inboards
As a follow up to this....not surprisingly, my starting issue got progressively worse to the point even advancing the throttle 50% would either not work or the engine would start, die, and then be flooded/unstartable for hours. Had to limp back to dock 4 times in a row on 1 engine. But then it would start the next day. Although this year, the worsened condition now requires 50% throttle advance for cold starts also.
Fast forward...my mechanic/friend and I replaced the injectors and the engine coolant temperature sensor on my problem engine. In the process, we did tests to verify the fuel pressure regulator, iac, tps, and map sensors were all good. Further, on both engines, we're working with fresh oil, fuel filters, plugs, wires, caps, rotors, and pcvs. The moment of truth...fire up the bad (SB) engine and the problem is still there; needs a throttle advance.
We then swap ignition coils. Try to start. Same story.
We then swap the computers (ECMs)...and the issue switched engines!
So....does anyone have any experience with weird engine issues caused by the ECM?
Does it usually require replacement? Or is there some other common culprit in the form of loose connections, poor ground, corroded contacts? Any guidance how to attack this? If the ECM wasn't $3200, I'd just replace it.
Thanks!
Fast forward...my mechanic/friend and I replaced the injectors and the engine coolant temperature sensor on my problem engine. In the process, we did tests to verify the fuel pressure regulator, iac, tps, and map sensors were all good. Further, on both engines, we're working with fresh oil, fuel filters, plugs, wires, caps, rotors, and pcvs. The moment of truth...fire up the bad (SB) engine and the problem is still there; needs a throttle advance.
We then swap ignition coils. Try to start. Same story.
We then swap the computers (ECMs)...and the issue switched engines!
So....does anyone have any experience with weird engine issues caused by the ECM?
Does it usually require replacement? Or is there some other common culprit in the form of loose connections, poor ground, corroded contacts? Any guidance how to attack this? If the ECM wasn't $3200, I'd just replace it.
Thanks!